- .include "asm86.h"
- .include "ti86asm.inc"
- .include "ram86.inc"
- .include "ti86abs.inc"
+;----------------------------------------------------------------------------
+;---------------------- NEMESIS ---------------------------------------------
+;----------------------------------------------------------------------------
+
+; Title : Nemesis
+; Version : 0.97
+; Release Date : 25.VI.00
+; Filename : nemesis.86p (6kb)
+; Author(s) : Shiar
+; Email Address : shiar0@hotmail.com
+; ICQ ; #43840958
+; Web Page : www.shiar.org
+; Description : cool arcade-shoot-em-up-game
+; Where to get this game : www.shiar.org | www.ticalc.org
+; Other games by author : Worm
+
+; ABOUT: This source should only be used for learning practises, do not
+; alter it, and certainly do not distribute an altered version!!
+; NOTE: &&& marks uncertainties or things to optimize
+
+;---------------------- nemesis.z80 start -----------------------------------
+
+#include "asm86.h"
+#include "ti86asm.inc" ;standard ti86 romcalls
+#include "ti86abs.inc" ;used to save hiscores and so
.org _asm_exec_ram
-TEXT_MEM = _textShadow
-DELC_LEN = _undelBufLen ;$64 bytes long
-_dispahl = $4a33
-
- nop
- jp init
- .dw $0001 ;description type 2 (= +YASicon)
- .dw Title ;pointer to description
- .dw spr_ship ;pointer to YAS icon
-
-Title: .db "Nemesis v0.93.911 by Shiar",0
-
-just_fired = TEXT_MEM ;byte
-temp1 = TEXT_MEM+1 ;word
-RanPos = TEXT_MEM+3 ;byte
-firex = TEXT_MEM+4 ;byte
-firey = firex+1 ;byte
-mx = TEXT_MEM+6 ;byte
-my = mx+1 ;byte
-your_locpos = TEXT_MEM+8 ;byte
-your_prevpos = TEXT_MEM+9 ;16 words
-
-nrybullets = 20
-ybullets = your_prevpos+32 ;20 x (state,x,y)
-nrebullets = 10
-ebullets = ybullets+(nrybullets*3) ;10 x (state,x,y)
-
-nrenemies = 10
-enemies = DELC_LEN
- ; %111111 (HP left) 11 (00=no enemy 01=exploding 10=normal 11=moving)
- ; %11111111 (ship type or explosion frame) %11111111 (x) %11111111 (y)
-add2enemy = nrenemies*4
-enemiesxtra = enemies+add2enemy
- ; $11 (move) $11 (fire)
-
-;---------------------- init --------------------------------------------------
-
-init:
- call _runindicoff ;turn the run-indicator off, obviously
- call _clrLCD ;clean the screen
- ld (iy+13),0
- xor a
- ld (DELC_LEN),a
-
- ld a,(CONTRAST) ;load current contrast level
- cp $1f ;if already at maximum...
- jr z,skipdarken ;...then skip level increase
- inc a ;otherwise increase contrast level
-skipdarken:
- out (2),a ;set it
+#define cal call ;just to make it harder for you to understand
+#define psh push ; ^:D
+#define dnz djnz ;Dec&Jump while NonZero becomes Do w.Non-Zero
+
+;GRAPH_MEM = $C9FA ;display buffer
+TEXT_MEM = _textShadow ;167 bytes ($A7): C0F9-C1A0
+_clrWindow = $4a86 ;a new procedure from AsmStudio86 inc. files
+_ex_ahl_bde = $45f3
+_shracc = $4383
+_dispahl = $4a33
+_asapvar = $d6fc
+
+storepos = _asm_exec_ram+6000 ;120 OF 165
+storepos2 = _asm_exec_ram+6200 ;141 OF 167
+
+;---------------------- in-game vars ----------------------------------------
+
+just_fired = storepos ; +0 ;counts how long a blast lasts
+menuitem = storepos ; +0 ;used to store menu location
+hiscorepos = storepos ; +0 ;entering hiscore name
+ ; ;--------YOU
+x = storepos+1 ; +1 ;your ship's position
+y = x+1 ; +2 ;your y-pos
+firex = y+1 ; +3 ;(1 byte)
+firey = firex+1 ; +4 ;(1 byte)
+ ; ;--------LEVEL
+eventleft = storepos+5 ; +5 ;nr. of enemies still to come
+nextevent = eventleft+1 ; +6 ;time to next event
+level_enemy = nextevent+1 ; +7 ;enemy type
+level_info = level_enemy+1 ; +8 ;info (see below)
+level_move = level_info+1 ; +9 ;=
+level_fire = level_move+1 ;+10
+ ; ;--------OBJECTS
+spacespace = storepos+19 ;+19
+groundinfo = spacespace+1 ;+20
+groundpos = groundinfo+1 ;+21 $10
+ceilingpos = groundpos+16 ;+37 $10
+ ; ;--------STARS
+stars1 = ceilingpos+16 ;+53
+stars2 = stars1+1 ;+54
+nrstars1 = 7
+starx1 = storepos+55 ;+55
+nrstars2 = 7
+starx2 = starx1+(nrstars1*2) ;+69
+ ; ;--------MULTIPLES
+mx = starx2+(nrstars2*2) ;+83 ;position of multiple#1
+my = mx+1 ;+84 ;multiple y-pos
+m2x = my+1 ;+85
+m2y = m2x+1 ;+86
+your_locpos = m2y+1 ;+87 ;position in your_prevpos tabl
+your_prevpos = your_locpos+1 ;+88 ;save previous positions (32d)
+
+;^-----------------------------------<1 ;-120=$78
+
+enemies = storepos2 ; +0 ;info about each enemy
+enemysize = 7 ;infobytes per enemy
+nrenemies = 16 ;max. nr of enemies
+
+ybullets = enemies+(nrenemies*enemysize) ;60 bytes = 20(state,damg,x,y)
+nrybuls = 64 ; +80\
+ebullets = ybullets+(nrybuls*4) ;+110 ;30 bytes = 10(state,x,y)
+nrebuls = 16
+lvlenemies = ebullets+(nrebuls*3)
+
+;^-----------------------------------<2 ;-141=$8D
+;level_info:
+; [0000:damage 0:directfire 0:ground 0:ceiling 0:diagfire]
+;enemies:
+; [HP64] [000000:HP left 00:(00=no enemy 01=exploding 10=normal 11=moving)]
+; [ship type or explosion frame] [x] [y] [move] [fire]
+
+;---------------------- introduction ----------------------------------------
+
+ nop ;hello yas/ase/rascall/whathever
+ jp init ;here's the program, but first: a description
+ .dw $0001 ;description type 2 (description + YASicon)
+ .dw Title ;pointer to description (all shells)
+ .dw Icon ;pointer to YAS icon
+
+Title: .db "Nemesis v0.97 by SHIAR",0
+
+Icon: .db 8,1 ;icon for YAS: width = 1byte; height = 9bytes
+ .db %11100000 ; ███
+ .db %01111000 ; ████
+ .db %00111110 ; █████
+ .db %01111001 ; ████ █
+ .db %00111110 ; █████
+ .db %01111000 ; ████
+ .db %11100000 ; ███ ;recommend 80x50 screen mode
+ .DB 0 ;clear stupid YAS-line
+
+;---------------------- init ------------------------------------------------
+
+int_handler:
+ ex af,af'
+ in a,($03)
+ bit 3,a
+ jp z,$0039
+ res 0,a
+ out ($03),a
+ jp $0039
+int_end:
+
+init: cal BUSY_OFF ;turns the run-indicator off, obviously
+ cal _clrScrn ;clean the screen
+ xor a ;ld a,0
+ res 2,(iy+13) ;don't scroll the screen
+ cal _flushallmenus ;remove TI menus
+
+FixKeys: ;fixes some key problems like left+down bug
+ im 1
+ ld a,$D4
+ ld bc,$0100
+ ld h,a
+ ld l,c ;ld hl,$D400
+ ld d,a
+ ld e,b ;ld de,$D401
+ dec a ;ld a,$D3
+ ld (hl),a
+ ldir
+ ld hl,int_handler
+ ld d,a
+ ld e,a ;ld de,$D3D3
+ ld bc,int_end-int_handler
+ ldir
+ inc a ;ld a,$D4
+ ld i,a
+ im 2
-;---------------------- main menu ---------------------------------------------
+;---------------------- main menu -------------------------------------------
LogoPut:
- ld hl,logo_nemesis ;from...
- ld de,VIDEO_MEM+16 ;...to one line from top
- ld a,19 ;19 rows
-LogoLoop:
- ld bc,16 ;set screen width
- ldir ;display one line
- dec a ;decrease line-counter
- jr nz,LogoLoop ;repeat when counter is not yet zero
-
- ld hl,VIDEO_MEM+(16*$39)+4 ;$39 rows down, 4 cols right (4*8=$20)
- ld b,$8 ;draw 8x one byte = 8*8 = 64 pixels wide
+ xor a ;white bitmask (a=0)
+ ld hl,logo_nemesis ;from...
+ ld de,VIDEO_MEM+16 ;...to one line from top
+ ld b,e ;ld b,16: one line
+AboveLogo:
+ ld (de),a ;clear/n byte
+ inc de ;next
+ dnz AboveLogo ;repeat for the first line
+ ld bc,16*19 ;logo size
+ ldir ;display one line of logo
+
+ ld hl,16*$33+VIDEO_MEM ;$33 rows down
+ ld b,16*7 ;draw black 7 lines
ld a,%11111111 ;horizontal line mask
underline:
ld (hl),a ;draw one piece of the divider-line
inc hl ;move right (8 pixels = 1 byte)
- djnz underline ;repeat (16bytes * 8pixels =128= screen width)
-
- set 3,(iy+5)
- ld hl,$3320 ;near the bottom of the screen
- ld (_penCol),hl
- ld hl,txt_about ;display version and author (yes, that's me!)
- call _vputs
- res 3,(iy+5)
+ dnz underline ;repeat
- ld hl,$3a1e ;below previous stuff
+ ld hl,_txt_email ;at the very bottom of tha screen
ld (_penCol),hl
ld hl,txt_email ;hey, my e-mail address so SEND ME SOMETHING!!
- call _vputs ;VERY important, so display in small font ?:}
+ cal _vputs ;VERY important, so display in small font ?:}
+
+ set 3,(iy+5) ;set white on black
+ ld de,_txt_about ;near the bottom of the screen
+ ld (_penCol),de ;hl=txt_email++=txt_about
+ cal _vputs ;display version + me
+ res 3,(iy+5) ;return to default black on white
+
+dispmenu:
+ ld de,$0304
+ ld (_curRow),de
+ ld hl,txt_menu1
+ cal _puts
+ ld de,$0305
+ ld (_curRow),de
+ ld hl,txt_menu2
+ cal _puts
+
+ xor a
+ ld (menuitem),a
+
+menuloop:
+ ld a,(menuitem)
+ ld h,$01
+ add a,4
+ ld l,a
+
+ ld a,5
+ ld (_curRow),hl
+ cal _putc
- call _getkey ;wait for keypress
- call New_game ;prepare level
+ ld a,(menuitem)
+ ld h,$01
+ sub 5
+ neg
+ ld l,a
+
+ ld a,32
+ ld (_curRow),hl
+ cal _putc
+
+ halt \ halt
+
+ cal GET_KEY ;wait for keypress
+ cp K_UP
+ jr z,menuchange
+ cp K_DOWN
+ jr z,menuchange
+ cp K_EXIT
+ jr z,menuexit
+ ld hl,_invert
+ cp K_F1
+ cal z,undo_invert
+ cp K_F2
+ cal z,do_invert
+ cp K_ENTER
+ jr nz,menuloop
+
+ ld a,(menuitem)
+ dec a
+ cal nz,New_game
+ jp samelevel ;game_main_loop
+
+menuexit:
+ ld hl,0
+ ld (your_score),hl
+ jp game_over
+
+menuchange:
+ ld a,(menuitem)
+ xor 1
+ ld (menuitem),a
+ jr menuloop
+
+do_invert:
+ ld (hl),$2F ;cpl
+ ret
+undo_invert
+ ld (hl),$B7 ;or a
+ ret
-;------------------------------------------------------------------------------
-;---------------------- game loop ---------------------------------------------
-;------------------------------------------------------------------------------
+;----------------------------------------------------------------------------
+;---------------------- game loop -------------------------------------------
+;----------------------------------------------------------------------------
game_main_loop: ;REPEATS FROM HERE EVERY FRAME
ld hl,timer ;update time
inc (hl) ;increase by 1
- ld b,(hl) ;new time, save for rand# upd. (no flag change)
- jr nz,updaterandom ;continue when new time <> 0
+ jr nz,Clear_screen ;continue when new time <> 0
ld hl,1 ;once every 256 frames, increase score by 1
- call scoreInc ;do it
-
-updaterandom:
- ld hl,RanPos ;random counter
- ld a,(hl) ;random value
- add a,b ;even more random by adding timer
-.db $80+7 ;<add a,r>
- ld (hl),a ;save even more random value back
+ cal scoreInc ;do it
Clear_screen:
ld hl,GRAPH_MEM ;move from (hl) = top left
ld (hl),$00 ;first pixel will be copied all over the screen
ld de,GRAPH_MEM+1 ;(de) = next pixel, thus clearing whole screen
ld bc,896 ;loop 896 times = (128/8) * (64-8 for scorebar)
- ldir ;clear!
+ ldir ;all clear!
+
+ ld a,0 ;current frame/turn 0-255
+timer =$-1
+ and %11 ;a=0 once every 4 turns
+ jr z,movestarsdone ;don't move stars once every 4 frames
+ cal movestars1 ;move the stars on the FRONT layer
+ cal movestars2 ;move the distant stars
+movestarsdone:
+ ld a,(stars1) ;star positions (the missing byte...)
+ ld b,nrstars1 ;how many stars? now we know.
+ ld hl,starx1 ;points to the position of the stars
+ cal DisplayStars ;display front layer stars
+ ld a,(stars2) ;weren't you paying attention five lines ago?
+ ld b,nrstars2 ;that many?! whow!
+ ld hl,starx2 ;and there they are
+ cal DisplayStars ;use the same procedure to display back layer
+
+ ld a,(level_info) ;level info
+ and %00000110 ;isolate ground&ceiling
+ jr z,game_stuff ;both non-present
+ and %00000010 ;bit representing the presence of any ceiling
+ cal nz,Handle_ceiling ;scroll the ceiling (if any) +check4collision
+ cal Handle_ground ;scroll the ground and check if we're dead
+
+game_stuff:
+ cal Handle_Ship ;move you
+ ld a,(your_occ) ;are you 100% OK?
+ or a ;a=0??
+ jr nz,_gamestuff1 ;then don't check for movements/fires/...
check_keys:
- ld a,%00111111 ;function keys (MORE,EXIT,2ND,F1,F2,F3,F4,F5)
+ ld a,%10111111 ;function keys (MORE,EXIT,2ND,F1,F2,F3,F4,F5)
out (1),a ;ask for them
nop \ nop ;delay 8 clocks
in a,(1) ;get zem!
check_exitkey:
bit 6,a ;test bit 6 = exit-key = EXIT
- jp z,game_over_nopop ;<exit> pressed, so be it
-check_morekey:
+ jp z,game_over ;<exit> pressed, so be it
+check_morekey: ;another unused label... poor compiler
bit 7,a ;test bit 7 = more-key = PAUSE
- call z,Pause ;yes, go to pause
+ cal z,Pause ;yes, go to pause
check_firekey:
bit 5,a ;test bit 5 = 2nd-key = FIRE
- ld hl,game_stuff ;where to continue after executing Fire_bullet
- push hl ;push hl on stack (instead of call Fire_bullet)
- jp z,Fire_bullet ;fire smtn (bulletstorplasersmultiples+stuff..)
- pop hl ;no call to Fire_bullet made, so pop stack
- ld hl,just_fired ;no:
- ld (hl),0 ;reset just_fired
-
-game_stuff:
- call Level_event ;insert enemies
- call Handle_Ship ;move you
- call Handle_enemies ;move enemies
-
- ld a,(your_occ) ;are you 100% OK?
- or a ;a=0??
- jr nz,activesdone ;then don't check for movements/fires/...
-
+ ld hl,check_selkey ;where to continue after executing Fire_bullet
+ psh hl ;push hl on stack (instead of cal Fire_bullet)
+ jp z,Fire_bullet ;fire smtn (bulletstorplasermultiples+stuff..)
+ pop hl ;no cal to Fire_bullet made, so pop stack
+ xor a ;no:
+ ld (just_fired),a ;reset just_fired
+
+check_selkey:
ld a,%01011111 ;look at first column of keys (ALPHA to STO)
- out (1),a ;gimme gimme
+ out (1),a ;gimme
nop \ nop ;what's taking you so long
in a,(1) ;at last... our precious keyzzz...
- ;old: <bit 7,a \ call z,select> now see this:
- rla ;test bit 7 so we know f ALPHA has been pressed
- call nc,select ;yeppy, select the currently selected upgrade
- call Enemies_hit ;check for collision with enemies
-activesdone:
- call Handle_bullets ;move your bullets
- call Handle_torp ;move your torpedo
- call Enemy_bullets ;move enemy bullets
+ bit 6,a ;'bout the GRAPH key...
+ cal z,Teacher ;you didn't _press_ it, did you?!?
+
+ rla ;test bit7 so we know f ALPHA has been pressed
+ cal nc,select ;yeppy, select the currently selected upgrade
+
+ cal Enemies_hit ;check for collision with enemies
+ cal inc_weapdamage
+
+_gamestuff1:
+ cal Handle_enemies ;move enemies
+
+ cal Handle_bullets ;move your bullets + check for hits
+ cal Enemy_bullets ;move enemy bullets
+ cal Handle_torp ;the same for your torpedo (assuming u have 1)
+
+ cal Level_event ;insert enemies
+ cal Display_Screen ;display all
- call Display_Screen ;display all
halt ;delay
+ jp game_main_loop ;LOOP ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+inc_weapdamage:
+ ld a,0
+weapincs =$-1
+ inc a
+ cp 97 ;max. 96 times (=96/16=6 increases)
+ ret nc ;return if already maxed
+ ld (weapincs),a ;save new incs
+
+ and %11110000 ;clear last 4 bits so no cf when rotating
+ ;btw: AND resets cf
+ rra ;rotate acting as shift (srl a) but just 1B
+ rra
+ rra
+ rra ;increase once just every 16 turns
+ ld b,a ;times to increase
+incthedamage:
+ add a,1 ;increase damage for one increase
+weapdaminc =$-1
+ dnz incthedamage ;a=total increase damage
+ ld b,1 ;minimal damage
+weapdamage =$-1
+ add a,b ;a=total damage
+ ld (curweapdamage),a ;safe the current damage
+ cal disp_charge
+ ret
+
+;--------------------------- ground -----------------------------------------
+
+Handle_ground:
+ ld a,(timer)
+ and %111 ;once every 8 frames
+ jr nz,Display_ground ;otherwise skip the scroll
+ ld bc,15 ;scroll all 16 bytes minus one (teh new byte)
+ ld hl,groundpos+1 ;from..
+ ld de,groundpos ;to (one byte to the left)
+ ldir ;LoaDIncreaseRepeat = scroll!
+
+ ld a,(groundinfo) ;what kind of ground
+ dec a ;type 1:
+ jr z,ground_tunnel ;tunnel effect
+ground_boring:
+ ld a,(groundpos) ;type 0
+
+ground_tunnel:
+ ld a,(groundpos+14)
+ ld d,a
+ ld hl,spacespace
+
+ ld bc,$201 ;range=1..3
+ cal Random ;a=1-3
+ dec a
+ jr z,newground ;same if a=1
+ dec a
+ jr z,gtunneldown ;down if a=2
+gtunnelup: ;up if a=3
+ ld a,(hl)
+ or a
+ jr z,newground ;a>=0 (a=0 actually)
+ inc (hl)
+ inc d
+ jr newground
+gtunneldown:
+ ld a,1
+ cp d
+ jr z,newground
+ dec d
+ dec (hl)
+newground:
+ ld a,d
+ ld (groundpos+15),a ;save new byte on the right
+
+Display_ground:
+ ld b,16 ;screen width
+ ld de,groundpos-1 ;height of current byte (previous actually)
+ psh de ;use later
+ ld hl,GRAPH_MEM+(56*16)-1 ;screen position
+ psh hl
+
+groundloopright:
+ ld c,b ;push b for groundloopup
+ pop hl \ inc hl ;get screen position and go one right
+ pop de \ inc de ;get height info and set to the next byte
+ psh de \ psh hl ;save these for the next time
+ ld a,(de) ;height of current byte
+ ld b,a ;save in b
+
+ ld de,16 ;to substract to go one line up
+ ld a,%11111111 ;bitmask black
+ or a
+groundloopup:
+ ld (hl),a ;display black byte
+ sbc hl,de ;go up (sbc must be used for 16-bit sub)
+ dnz groundloopup ;and loop >groundpos< times
+
+ ld b,c ;pop b used by groundloopup
+ dnz groundloopright ;loop right for entire screen (16x)
+ pop hl \ pop hl ;restore stack
+
+CheckGround: ;check for collision with the ground
+ ld a,(x)
+ srl a
+ srl a
+ srl a
+ inc a
+ ld l,a
+ ld h,0
+ ld de,groundpos
+ add hl,de
+ ld a,(y)
+ sub 57-7
+ neg
+ cp (hl)
+ ret nc
+ ld b,5
+ jp damage_you
- jr game_main_loop ;LOOP
+;--------------------------- ceiling ----------------------------------------
-;--------------------------- pause --------------------------------------------
+Handle_ceiling:
+ ld a,(timer)
+ and %111 ;once every 8 frames
+ jr nz,Display_ceiling ;otherwise skip the scroll
+ ld bc,15 ;scroll all 15 bytes (16th is new position)
+ ld hl,ceilingpos+1 ;from..
+ ld de,ceilingpos ;to (one byte to the left)
+ ldir ;LoaDIncreaseRepeat = scroll!
+
+ ld a,(groundinfo) ;what kind of ceiling
+ dec a ;type 1:
+ jr z,ceiling_tunnel ;tunnel effect
+ceiling_boring:
+
+ceiling_tunnel:
+ ld a,(ceilingpos+14)
+ ld d,a ;d=new ceiling
+ ld hl,spacespace
+
+ ld bc,$201 ;range=1..3
+ cal Random ;a=1-3
+ dec a
+ jr z,newceiling ;1:same
+ dec a
+ jr z,ctunnelup ;2:up
+ctunneldown: ;3:down
+ ld a,(hl)
+ or a ;(spacespace)=0:
+ jr z,newceiling+2 ;keep same ceiling
+ inc (hl)
+ inc d
+ jr newceiling
+ctunnelup:
+ ld a,1
+ cp d ;if size=1 then don't
+ jr z,newceiling
+ dec d
+ dec (hl)
+newceiling:
+ ld a,d
+ ld (ceilingpos+15),a ;save the new byte
+
+Display_ceiling:
+ ld b,16 ;screen width
+ ld de,ceilingpos-1 ;height of current byte
+ psh de ;use later
+ ld hl,GRAPH_MEM-17 ;screen position
+ psh hl
+
+ceilingloopright:
+ ld c,b ;push b for groundloopup
+ pop hl \ inc hl ;get screen position and go one right
+ pop de \ inc de ;get height info and set to the next byte
+ psh de \ psh hl ;save these for the next time
+ ld a,(de) ;height of current byte
+ ld b,a ;save in b
+
+ ld de,16 ;to substract to go one line up
+ ld a,%11111111 ;bitmask black
+ or a
+ceilingloopdown:
+ ld (hl),a ;display black byte
+ add hl,de ;go down
+ dnz ceilingloopdown ;and loop >groundpos< times
+
+ ld b,c ;pop b used by groundloopup
+ dnz ceilingloopright ;loop right for entire screen (16x)
+ pop hl \ pop hl ;restore stack
+
+CheckCeiling: ;check for collision with the ground
+ ld a,(x) ;your x
+ srl a ;x/2
+ srl a ;x/4
+ srl a ;x/8 (current ceiling-byte)
+ inc a ;correction
+
+ ld l,a ;hl = a
+ ld h,0 ;"
+ ld de,ceilingpos ;first ceiling-byte
+ add hl,de ;current ceiling-byte
+ ld a,(y) ;your y-pos
+ inc a
+ cp (hl) ;compare with ceiling
+ ret nc ;carry if ceiling is above you
+ ld b,5
+ jp damage_you ;otherwise you don't wanna be in that ship
+
+;--------------------------- move stars -------------------------------------
+
+DisplayStars: ;inputs: hl=starx# a=stars# b=nrstars#
+ ld e,(hl)
+ inc hl
+ ld d,(hl)
+ ld (de),a
+ inc hl
+ dnz DisplayStars
+ ret ;let's comment this: returns
+
+movestars2:
+ ld ix,starx2
+ ld a,(stars2)
+ rlca
+ ld (stars2),a
+ ret nc
+ ld b,nrstars2
+ jr movestars_loop
+
+movestars1:
+ ld ix,starx1
+ ld a,(timer)
+ rra
+ ld a,(stars1)
+ ret c
+ rlca
+ ld (stars1),a
+ ret nc
+ ld b,nrstars1
+
+movestars_loop:
+ ld h,(ix+1)
+ ld l,(ix)
+ dec hl
+
+ ld a,l
+ and %00001111
+ cp 9 ;(GRAPH_MEM&%00001111)-- = $C9FAand15-1 = $A-1
+ jr nz,newstarok
+ cal RandomY
+
+newstarok:
+ ld (ix),l
+ ld (ix+1),h
+ inc ix \ inc ix
+ dnz movestars_loop
+ ret ;for stupid people, here's another comment...
+
+;--------------------------- pause ------------------------------------------
Pause:
ld hl,$0200 ;top left
ld (_curRow),hl
ld hl,txt_pressenter ;"Enter to continue"
- call _puts ;display message
+ cal _puts ;display message
pause:
- call _getkey ;enter low-power mode and wait for key
+ cal _getkey ;enter low-power mode and wait for key
cp kEnter ;keypressed = enter?
jr nz,pause ;no, wait some more
ret ;continue
-;--------------------------- exit ---------------------------------------------
+;--------------------------- teacher ----------------------------------------
+
+Teacher:
+ ld (iy+12),5 ;enable flashing cursor
+ cal _clrScrn
+ cal _homeup ;top left
+ ld hl,txt_teacher
+ cal _puts ;display message
+
+teacherloop:
+ cal _getkey ;enter low-power mode and wait for key
+ cp kEnter ;enter pressed?
+ jr z,teacherans
+ cp kGrMenu ;keypressed = graph?
+ jr nz,teacherloop ;no, wait some more
+
+ ld (iy+12),0 ;disable cursor
+ jp disp_icons ;+ret
-quit:
- call _clrLCD ;clears screen
- call _homeup ;set cursor to top-left
- ld a,(CONTRAST) ;load original contrast level
- out (2),a ;and set it back
- ld (iy+13),6 ;restore system-flags
- ret ;quit Nemesis :(
+teacherans:
+ ld a,' '
+ cal _putc
+
+ ld hl,$0701
+ ld (_curRow),hl
+ ld hl,txt_teacherans
+ cal _puts
+ jr teacherloop
+
+
+;--------------------------- exit -------------------------------------------
+
+quit: im 1 ;release keyfix procedure
+ set 2,(iy+13) ;set back screen scrolling
+ xor a
+ ld (_asapvar+1),a ;next Asm( run will reload the program
+ ld hl,GRAPH_MEM ;graph-screen location
+ ld de,GRAPH_MEM+1
+ ld (hl),a
+ ld bc,1024-1 ;do it 1024 times = entire screen
+ ldir
+ jp _clrWindow ;as _clrLCD but also clears TEXT_MEM (like the
+ ;_clrScrn) AND also executes _homeup and ret
-;--------------------------- display ------------------------------------------
+;--------------------------- display ----------------------------------------
Display_Screen:
- ld hl,GRAPH_MEM ;from storage (top left)
- ld de,VIDEO_MEM ;to screen (top left)
- ld a,56 ;display height = 64 bytes (minus 8 for bar)
+ ld hl,GRAPH_MEM ;from buffer (top left)
+ ld de,VIDEO_MEM ;to real screen (top left)
+ ld c,56 ;display height = 64 bytes (minus 8 for bar)
displayloop:
- ld bc,16 ;display width = 16 bytes (16*8bits=256pixels)
- ldir ;16x de >> hl
- dec a ;next line
+ ld b,16 ;display width = 16 bytes (16*8bits=256pixels)
+displaytloop:
+ ld a,(hl) ;copy byte from (hl)
+_invert:
+ cpl ;xor $ff: invert byte (white<=>black)
+ ld (de),a ;to (de)
+ inc hl \ inc de ;next byte
+ dnz displaytloop ;16x hl >> de
+ dec c ;next line
jr nz,displayloop ;loop 64x
ld hl,$396b ;Display Score
ld (_penCol),hl ;bottom right of screen
- ld hl,(score)
-
-_D_HL_DECI: ;------- display 5-digit value -------
- ld de,savestr+4 ;savenr saves number string
- ld b,5 ;five digits
-ldhld: call UNPACK_HL ;one digit of hl
- add a,'0' ;make number
- ld (de),a ;save into savenr
- dec de ;point to next digit
- djnz ldhld ;repeat for all digits
-
- ld hl,savestr
- call _vputs ;display string
- ret
+ ld hl,(your_score)
+
+_D_HL_DECI: ;------- display 5-digit value -------
+ ld de,savestr+4 ;savenr saves number string
+ ld b,5 ;five digits
+ldhld: cal UNPACK_HL ;one digit of hl
+ add a,'0' ;make number
+ ld (de),a ;save into savenr
+ dec de ;point to next digit
+ dnz ldhld ;repeat for all digits
-savestr:
- .db "00000",0
+ ld hl,savestr ;we (the program) saved the value righthere
+ jp _vputs ;the only thing left to do is to display it
-;------------------------- handle ship ----------------------------------------
+savestr: ;@here the score will be stored
+ .db "00000",0 ;don't worry, it's just temporary
+
+;------------------------- handle ship --------------------------------------
Handle_Ship:
- ld a,(your_occ)
- or a
- jr z,ok ;0 = normal stat
+ ld a,(your_occ) ;are
+ or a ;you
+ jr z,ok ;ok?
- inc a ;next (explosion)frame
+ inc a ;no! next (explosion)frame
ld (your_occ),a ;save
cp 34 ;last explosion frame?
jp z,You_die ;yes = game over
ret ;don't display anything
-ok:
- ld a,%01111110
- out (1),a
+;----move----
+ok: ;we are
+ ld a,%01111110 ;get arrow keys
+ out (1),a ;it's cold outside
ld hl,y ;instead of nop\nop do something usefull
- in a,(1)
+ in a,(1) ;come back in
- ld b,a ;push a (keys)
+ ld b,a ;psh a (keys)
xor %11111111 ;inverted a = 0 if arrow-key has been pressed
ld a,(your_multiples)
jr z,no_adv ;if so, leave the multiples where they are
or %100 ;set move bit
jr adv_ok
-no_adv:
- and %11111011 ;reset move bit
-adv_ok:
- ld (your_multiples),a
- ld a,b ;pop a (keys)
+no_adv: and %11111011 ;reset move bit
+
+adv_ok: ld (your_multiples),a
+ ld a,(timer) ;framecounter
+ and %1 ;switches 0<>1 each frame
+ inc a ;a = 1 or 2 (1.5 avg)
+ ld c,a ;c = your_speed
+
+ ld a,b ;pop a (keys)
rra ;rotate right (put last bit in c)
- ld b,a ;we need a
+ ld b,a ;we need a later
jr c,no_down
ld a,(hl)
- cp 49 ;55-6 = bottom of screen
- jr z,no_down
- inc a
+ add a,c
+ cp 50 ;56-6 = bottom of screen
+ jr nc,no_down
ld (hl),a
no_down:
dec hl
rr b ;because we now use b, it's rr instead of rra
jr c,no_left
ld a,(hl)
- sub 1 ;<dec a> doesn't affect c-flag
+ sub c ;<dec a> doesn't affect c-flag
jr c,no_left ;-1 = left side
ld (hl),a
no_left:
- rr b
+ rr b
jr c,no_right
ld a,(hl)
- cp 121 ;127-6 = right side
- jr z,no_right
- inc a
+ add a,c
+ cp 122 ;128-6 = right side
+ jr nc,no_right
ld (hl),a
no_right:
- ld d,(hl)
+ ld d,(hl) ;d=x
inc hl
rr b
jr c,no_up
ld a,(hl)
- sub 1 ;<dec a> doesn't affect carry-flag
+ sub c ;<dec a> doesn't affect carry-flag
jr c,no_up ;-1 = top of screen
ld (hl),a ;save new y
-no_up: ld e,(hl)
- ld ix,spr_ship01 ;ship sprite
+no_up: ld e,(hl) ;e=y
+ ld ix,spr_ship01 ;normal ship sprite
ld hl,your_inv ;invulnerable?
ld a,(hl) ;load time in a
or a ;is it 0?
- jr z,handle_multiples ;yes so ship = normal (display \ continue)
+ jr z,disp_ship ;yes so ship = normal (display \ continue)
- ld b,a ;save inv-time
ld a,(timer) ;load frame nr.
- and %00000011 ;a=0 once every four frames
+ and %00000111 ;a=0 once every four frames
jr nz,not_time ;a<>0 = not time to update counter
dec (hl) ;decrease inv-time left
not_time:
- and %00000010 ;a switches 0<->1 every 2 frames
- jr z,no_flicker ;don't show normal sprite anyway
- ld a,b ;pop inv-time
- and %11110000 ;inv-time <16 ticks left?
- jr z,handle_multiples ;yes: display normal sprite and continue
+ and %00000100 ;a switches 0<->1 every 2 frames
+ jr z,disp_ship ;show normal ship
+inv_flicker:
+ ld ix,spr_ship01i ;display invulnerable ship
+disp_ship:
+ psh de ;save your position for multiples
+ cal putsprite ;display your ship
+ pop de
-no_flicker:
- ld ix,spr_ship01i ;display inv-ship (ld ix is faster than add ix)
+;----multiples----
handle_multiples:
- call putsprite ;display your ship
-
ld a,(your_multiples) ;do you have multiples
ld b,a ;save a for 2nd check
and %11 ;no? (last two bits = nr of multiples)
ret z ;then don't handle them either
- ld hl,y
ld a,b ;restore a (your_multiples)
- and %100 ;move the multiples???
- jr z,mult_adv ;nope, just let them (saves (y) in y, (x) in x)
+ and %100 ;move the multiples??? (=move bit set?)
+ jr z,mult_adv ;nope, just let them (saves (y)in y, (x)in x)
ld hl,your_locpos ;location to save this position
ld a,(hl) ;load a
- inc a ;a=a+1
+ inc a ;a=a+1 (next position)
and %00001111 ;if a>15 then a=a-16
ld (hl),a ;save new a
add a,a ;a=a*2
ld hl,your_prevpos ;previous positions
add hl,bc ;16 turns ago
- ld d,(hl) ;old x-pos
+ ld b,(hl) ;old x-pos
inc hl ;and
- ld e,(hl) ;old y-pos
- ld (mx),de ;save multiple position in (mx)
-
- ld a,(y) ;load new y-pos
- ld (hl),a ;save it for 16 turns in the future
- dec hl ;and
- ld a,(x) ;load new x-pos
- ld (hl),a ;save that too
+ ld c,(hl) ;old y-pos
+ ld (mx),bc ;save multiple position in (mx)
+ ld (hl),d ;save current pos. for 16 turns into the future
+ dec hl ;yes...
+ ld (hl),e ;...both
mult_adv:
- ld de,(mx)
+ ld de,(mx)
+ ld a,d
+ ld d,e
+ ld e,a ;ex d,e
ld ix,spr_multiple ;sprite of the multiple
jp putsprite ;display it + <ret>
+;----explode----
+
exploding_you:
srl a ;half the framerate
dec a ;first frame is 1>inc>srl>dec = 0
ld hl,x-1
-explosion_stuff:
- rra
- add a,a
- add a,a
+explosion_stuff: ;in:a=frame*2+(0 to 1); (hl)=xpos--
+ and %11111110
add a,a
+ add a,a ;frame*8
ld c,a
- ld b,0
- ld ix,spr_explosion
- add ix,bc
+ ld b,0 ;bc=a
+ ld ix,spr_explosion ;base sprite
+ add ix,bc ;go to correct sprite (each spr. is 8 bytes)
inc hl
- ld d,(hl)
+ ld d,(hl) ;load xpos
inc hl
- ld e,(hl)
- jp putsprite
+ ld e,(hl) ;and y
+ jp putsprite ;and display it too
+
+;----hit----
-damage_you:
+damage_you: ;damages you B points
ld a,(your_inv) ;invulnerability left?
or a
ret nz ;return if inv>0
ld hl,your_armor ;armor left
- ld a,(hl) ;check
- dec a ;is it 0?
- jp m,no_armor ;yes, 0hp left so explode
+ ld a,(hl) ;load hp in A
+ sub b ;decrease hp by B
+ jp m,no_armor ;<0hp left so explode
ld (hl),a ;no, so save decreased hp
- call disp_armor ;and display new value
- ret ;and return
+ jp disp_armor ;and display new value
no_armor:
ld a,%01 ;occ %xxxxxx01 = explode
- ld (your_occ),a ;set to explode
+ ld (your_occ),a ;too bad, you're dead meat
ret
-;------------------------- place multiples ------------------------------------
+;------------------------- place multiples ----------------------------------
-Place_multiples
+Place_multiples:
ld (mx),de ;set last multiple-position
ld hl,your_prevpos ;place all previous positions
ld b,16 ;all 16 of them
inc hl ;next
ld (hl),e ;set prev-y to e
inc hl ;next
- djnz place_multiples ;repeat
+ dnz place_multiples ;repeat
ret
-;------------------------- select upgrade -------------------------------------
+;------------------------- select upgrade -----------------------------------
select:
ld hl,your_pickup ;select pickups
ld a,(hl) ;load pickups taken so far
dec a ;is it 1?
+ ret m ;return if it's 0 (no pickups)
jr nz,select2 ;no, carry on
- ld (hl),a ;reset pickups (a=0)
- ld hl,your_armor ;change armor
- inc (hl) ;increase HPs by one
+select1:
+ ld a,(your_armor) ;load current armor
+ cp 25-6 ;may not become >=25
+ jr c,select1_ ;ok then just add 6
+ ld a,25-6 ;set to maximum (6 will be added below)
+select1_:
+ add a,6 ;add 6 to armor
+ ld (your_armor),a ;change armor
+ xor a ;ld a,0
+ ld (your_pickup),a ;reset pickups
jp disp_icons ;display and return
select2:
dec a ;is it 2?
dec a ;is it 3?
jr nz,select4 ;no, carry on
ld (hl),a ;reset pickups
+ ld hl,your_weapon
+ ld a,(hl)
+ inc a
+ cp maxnrweapons
+ jp nc,disp_icons ;weapon maxed out
+ ld (hl),a ;set new weapon
+ cal loadweapon ;load it (damage and stuff)
jp disp_icons ;display n return
select4:
dec a ;is it 4?
jr nz,select5 ;no, carry on again
ld (hl),a ;reset pickups
inc a ;a=1
- ld (your_laser),a ;ready laser
+ ld (your_weapon),a ;ready laser
jp disp_icons ;display + return
select5:
dec a ;is it 5?
inc a
ld (your_multiples),a
ld de,(x)
- call Place_multiples
+ cal Place_multiples
jp disp_icons ;display, return
select6:
ld (hl),0 ;reset pickups
jp disp_icons ;display/return
-;------------------------- fire bullet ----------------------------------------
+;------------------------- fire bullet --------------------------------------
Fire_bullet:
- ld hl,RanPos ;random
- inc (hl) ;update random counter
-
ld hl,just_fired
ld a,(hl) ;just_fired
cp 5 ;already pressed?
ret z ;return when already pressed (=5)
+
inc (hl) ;otherwise increase counter (0 to 4 >> 1 to 5)
- ld a,(your_laser) ;if you have bullets.....
- or a ;(0=no laser)
- jr nz,fireOK
+ ld a,(your_weapon) ;if you have bullets.....
+ dec a ;(1=laser)
+ jr z,fireOK
ld (hl),5 ;.....then can't fire next turn (go to 5 imm.)
fireOK:
ld hl,(x) ;yes: first fire from ship position (x)
- ld (firex),hl ;set firepos
ld a,(your_multiples) ;any multiples?
and %11 ;nope?
jr z,fireany ;then just fire somethin'
- call fireany ;and blast
- ld hl,(my) ;then, fire from multiple position (mx)
- ld a,(mx) ;<ex h,l>
- ld h,a ; ^^^^^^
- ld (firex),hl ;set firepos
+ cal fireany ;and blast
+ ld hl,(mx) ;then, fire from multiple position (mx)
+ dec h ;one up (-2 height: keeps weapons centered)
;blast again and <ret>
-fireany:
- ld a,(your_laser) ;do you have laser?
- dec a ;1=yes
- jr nz,fire_ybullet ;no, just fire a bullet
+fireany: ;HL=(x,y)
+ ld (firex),hl ;set position to fire from
+ cal fire_torp ;&&&
+
+ ld a,(your_weapon) ;do you have laser?
+ ld ix,weapondata-6-(256*3)
+ add a,a ;weap*2
+ add a,a ; *4
+ add a,a ; *8
+ ld c,a
+ ld b,3 ;go to current weapon (bc=a)
+ add ix,bc
-fire_laser: ;yes, fire that laser instead
- ld a,(firex) ;a = your x-pos
- ld d,a
+fire_weapon: ;b=3
+ psh bc ;save counter
+ ld a,(ix) ;load this weapon
+ cp %11110000 ;%11110000=laser
+ cal z,fire_laser ;fire laser (will set a=0 when done)
+ or a ;<>0=bullet
+ cal nz,fire_ybullet
+ inc ix
+ inc ix
+ pop bc ;weapon counter (do 3 weapons)
+ dnz fire_weapon
+ ret
- ld hl,GRAPH_MEM ;save-location
- ld a,(firey) ;y-coord
- add a,3 ;at middle of your ship (y+3)
+;-----fire LASER-----
+
+fire_laser:
+ ld b,0 ;overflow counter
+ ld hl,firex
+ ld d,(hl) ;d = your x-pos
+ inc hl
+
+ ld a,(hl) ;base y-coord (firey)
+ add a,(ix+1) ;at specified offset (most likely the middle)
ld e,a ;save laser-y in e
+ psh de ;save unmodified (x,y)
add a,a ;y*2
add a,a ;y*4
add a,a ;y*8
srl d ;X/4
srl d ;X/8
add a,d ;a = (Y*16+X/8) mod 256 (c set on overflow)
+
jr nc,_nolc ;jump if no carry = no overflow = a<=255
inc b ;a>255 so increase bc by 256
_nolc: ld c,a ;c = (Y*16+X/8) mod 256
- add hl,bc ;bc = Y*16+X/8
-
+ ld hl,GRAPH_MEM ;save-location
+ add hl,bc ;bc = Y*16+X/8: hl=screen address
ld a,15 ;128/8=16=screen width ** minus one (inc a ^^)
sub d ;minus x-start (d=X/8)
ld b,a
- ld c,0
drawlaser:
ld (hl),%11111111
inc hl ;Go to next byte
- djnz drawlaser
-
+ dnz drawlaser
handle_laser:
- ld a,(firex)
- ld d,a ;d was divided, so reload the laser-x
+ pop de ;de=(firex): x-pos unmodified
check_laserhits: ;de = (x,y)
- ld ix,nolashit
- ld b,nrenemies
- ld hl,enemies
-
-laserhits: ;Hits with normal enemies
- push hl
-
- ld a,(hl)
- and %00000010
+ ld b,nrenemies ;check all enemies
+ ld hl,enemies+1 ;enemy#1+occ/hp00
+laserhits: ;hits with normal enemies
+ psh hl
+ ld a,(hl) ;occ+hp00
+ and %00000010 ;normal/moving occ.=%1x
jr z,nolashit ;no hit when enemy_occ <> 2/3
-
inc hl ;enemy type
ld a,(hl)
or a ;enemy #0 = pickup
jr z,nolashit ;yes: don't destroy
-
inc hl
ld a,(hl) ;check x
sub d
jp m,nolashit ;no hit when enemy is left of you
-
inc hl
ld a,(hl) ;check y
sub e
- jp z,enemy_hit ;a-e=0 = laser on top line of enemy = hit
+ jr z,enemy_lashit ;a-e=0 = laser on top line of enemy = hit
jr nc,nolashit ;a-e>0 = enemy above laser = no hit
- add a,5 ;add enemy height
- jp p,enemy_hit ;a-e>0 = hit
-
+ add a,5 ;add enemy height&&&
+ jp m,nolashit ;a-e>0 = hit
+enemy_lashit:
+ ld a,(curweapdamage) ;damage
+ cal enemy_hit ;hl=enemy+y
nolashit:
- pop hl
- inc hl ;go to next enemy
- inc hl
- inc hl
- inc hl
- djnz laserhits ;check all enemies
+ pop hl ;enemy+1
+ ld a,b ;psh bc
+ ld bc,enemysize
+ add hl,bc ;go to next enemy
+ ld b,a ;pop bc
+ dnz laserhits ;check all enemies
+ xor a ;a=0 otherwise weird things might happen :P
+ ld (weapincs),a ;reset damage
+ ret
- ld a,d ;<ex d,e>
- ld d,e
- ld e,a
- jr fire_torp ;fire torpedoes as well
+;-----misc-----
+
+fire_torp:
+ ld de,(firex)
+ ld hl,torp_occ ;torpedo...
+ ld a,(hl) ;load torpInfo
+ dec a ;do you have (unused) torpedoes?
+ ret nz ;nope (a must be 1)
+ ld (hl),2 ;yes; use torpedo
+ ld (torp_pos),de ;save torpedo position (in de)
+ ret
+
+;-----fire BULLETs-----
fire_ybullet:
- ld hl,ybullets
- ld de,3
- ld b,nrybullets
+ ld c,a ;save bulletType in c
+ ld hl,ybullets ;check for unused bullet
+ ld de,4
+ ld b,nrybuls
find_ybullet:
ld a,(hl)
or a
jr z,found_ybullet ;0 = no bullet here
add hl,de
- djnz find_ybullet ;look next bullet
- ret
+ dnz find_ybullet ;look next bullet
+ pop hl ;don't try to fire any other bullets
+ ret ;so ret twice
found_ybullet:
- ld (hl),1 ;use bullet
+ ld (hl),c ;use the bullet and set correct bullet-type
+ inc hl ;@damage
+ ld (hl),1 ;set bullet damage
+curweapdamage =$-1
ld a,(firex) ;your x-pos
add a,5 ;place bullet in front of you
inc hl ;go to bullet-x
ld (hl),a ;set x
- ld e,a ;save torp-x in e
ld a,(firey) ;your y-pos
- add a,2 ;place bullet at the middle of your ship
+ add a,(ix+1) ;place bullet at the middle of your ship
inc hl ;go to bullet-y
ld (hl),a ;set y
- add a,3 ;place torpedo at bottom of ship
- ld d,a ;save torp-y in d
-fire_torp:
- ld hl,torp_occ ;torpedo...
- ld a,(hl) ;load torpInfo
- dec a ;do you have (unused) torpedoes?
- ret nz ;nope (a must be 1)
- ld (hl),2 ;yes; use torpedo
- ld (torp_pos),de ;save torpedo position (in de)
+ xor a
+ ld (weapincs),a ;reset damage
ret
-;------------------------ handle bullets --------------------------------------
+;------------------------ handle bullets ------------------------------------
+
+bullet_left:
+ ld a,124
+ sub b
+
+ cp (hl) ;off screen? (x>128-5)
+ jr c,remove_bullet
+ ld a,(hl) ;a = X
+ add a,b ;move b to the right
+ ld (hl),a ;save new pos.
+ ld d,a ;d = X
+
+ inc hl ;@y-pos
+ ld a,c
+ cal _shracc
+ dec a
+ jr z,bullet_noymove
+ dec a
+ jr z,bullet_up
+ dec a
+ jr z,bullet_halfup
+ dec a
+ jr z,bullet_down
+
+bullet_halfdown:
+ ld a,(timer)
+ and 1
+ jr z,bullet_noymove
+bullet_down:
+ ld a,(hl)
+ inc a
+ cp 55
+ jr z,bullet_noymove
+ ld (hl),a
+bullet_halfup:
+ ld a,(timer)
+ and 1
+ jr z,bullet_noymove
+bullet_up:
+ ld a,(hl)
+ dec a
+ jr z,bullet_noymove
+ ld (hl),a
+bullet_noymove:
+ ld e,(hl) ;e = Y
+ ret
remove_bullet:
- dec hl
+ pop hl ;cal bullet_left
+ pop hl ;enemy+type
ld (hl),0 ;dump this bullet!
- ret
+ jr next_ybullet+1 ;+1:skip pop hl at next_ybullet
Handle_bullets:
ld hl,ybullets
- ld b,nrybullets
+ ld b,nrybuls
scan_bullets:
- push bc
- push hl
- ld (temp1),hl
- ld a,(hl)
- inc hl
- dec a ;type 1?
- call z,bullet_2left ;yes: 2left
- pop hl
- pop bc
- ld de,3
- add hl,de ;3 x <inc hl>
- djnz scan_bullets ;next bullet (loop)
- ret
+ psh bc ;bullet counter
+ psh hl ;save enemy+type
+ ld (temp1),hl ;needed for check_bullethits
+ ld a,(hl) ;@bulletType
+ inc hl ;@damage
+ inc hl ;@x
-bullet_2left:
- ld a,(hl) ;d = X
- cp 122 ;off screen? (x>128-5)
- jr nc,remove_bullet
- add a,2 ;move 2 2 the right
- ld (hl),a ;save new pos.
- ld d,a
+ or a
+ jp z,next_ybullet ;bulletType=0 >> no bullet
- inc hl ;to y-pos
- ld e,(hl) ;e = Y
+ ld c,a ;c=type
+ and %1111
+ ld b,a ;b=0000type
+ cal bullet_left ;move bullet left
- ld ix,spr_bullet01
- push de
- call putsprite ;display bullet
- pop de
+display_bullet:
+ psh de ;save de =position
+ dec hl ;@x
+ dec hl ;@damage
+ ld a,(hl) ;bullet damage=size
+ ld hl,XLbullettable ;pointer to first bullet
+ srl a
+ srl a ;per 4
+ ld d,0
+ ld e,a ;->16bit (de=a)
+ add hl,de ;point to correct bullet offset
+ ld a,(hl) ;load bullet offset
+ ld e,a ;convert to 16bit (d=0)
+ ld ix,spr_bullet01 ;first sprite
+ add ix,de ;add offset (go to correct sprite)
+ pop de ;saved position
+
+ ld a,(ix) ;bullet x-size
+ ld (bulletxsize),a ;used at check_bullethits
+ ld a,(ix+1) ;bullet y-size...
+ ld (bulletysize),a ;...too
+
+ psh de ;but will be altered so save again
+ cal putsprite ;display bullet
+ pop de ;position (used for check_bullethits)
+
+ cal check_bullethits
+
+next_ybullet:
+ pop hl ;restore enemy+type
+ inc hl
+ inc hl
+ inc hl
+ inc hl ;skip type,dam,x,y: next enemy+type
+ pop bc ;b=counter
+ dnz scan_bullets ;next bullet (loop)
+ ret
+
+;--------------------------- check bullethits -------------------------------
-check_bullethits: ;INPUT: de=X,Y
+check_bullethits: ;INPUT: de=X,Y; (temp1)=bullet
ld b,nrenemies
- ld hl,enemies
- ld ix,nohit
+ ld hl,enemies+1
hit_enemies: ;Hits with normal enemies
- push hl
+ psh bc ;enemy counter
+ psh hl
ld a,(hl)
and %00000010
or a ;enemy #0 = pickup
jr z,nohit ;yes: don't destroy
- inc hl
+ cal find_sprite ;set ix to the sprite of this enemy
+
+ inc hl ;@x
ld a,(hl) ;check x
- sub d
- add a,5
- jp m,nohit
- cp 8
- jr nc,nohit
+ sub d ;minus bullet x-position
+ ld b,a ;psh a
+ sub 5 ;minus bullet x-size
+bulletxsize =$-1
+ jp p,nohit ;miss
+ ld a,b ;pop a
+ add a,(ix) ;add enemy width
+ jp m,nohit ;miss
- inc hl
+ inc hl ;@y
ld a,(hl) ;check y
- sub e
- add a,5
- jp m,nohit
- cp 10
- jr nc,nohit
-
- push hl
- ld hl,(temp1)
- ld (hl),$00 ;remove bullet
+ sub e ;minus bullet y-position
+ ld b,a ;psh a
+ sub 3 ;substract bullet height
+bulletysize =$-1
+ jp p,nohit ;nope, missed it
+ ld a,b ;pop a
+ add a,(ix+1) ;add enemy height
+ jp m,nohit ;missed after all
+
+ ;---bullet hits enemy (auch-time!)---
+ psh hl
+ ld hl,0 ;@bulletType
+temp1 =$-2
+ ld (hl),0 ;remove bullet
+ inc hl ;@damage
+ ld a,(hl) ;set damage
+ pop hl ;enemy+y
+ cal enemy_hit
+nohit:
pop hl
+ ld bc,enemysize
+ add hl,bc
+ pop bc
+ dnz hit_enemies ;check next enemy
+ ret
-enemy_hit:
- dec hl
- dec hl
- dec hl
- ld a,(hl) ;occ
- ld c,a ;push occ
- and %11111100 ;occ/4 = HP left ;<srl a\srl a
- jr nz,hpleft ;not zero -> jump
- ld (hl),%01 ;set to explode
+enemy_hit: ;*in:a=damage;hl=enemy+y
+ add a,a ;a=damage to inflict
+ add a,a ;first 2 bits used for occ.
+ ld b,a
+ dec hl ;@x
+ dec hl ;@type
+ dec hl ;@hp00 (occ)
+ ld a,(hl) ;load hp00
+ sub b ;decrease HP (if <0xx then c is set)
+ ld (hl),a ;save (no flag-changes)
+ dec hl ;@hp64; no change in c
+ ld a,(hl) ;load; no c-change
+ sbc a,0 ;if cf then decrease a
+ ld (hl),a ;save back the new value
+ ret nc ;if a>=0 then return, otherwise explode
+
+ inc hl ;goto occ again
+ ld (hl),%01 ;set to explode
ld a,(pickuptimer) ;counts enemies destroyed
dec a ;enough destroyed for a pickup?
jr nz,pickupdone ;otherwise just explode
- ld (hl),%00000110 ;change it into a pickup (with 2 HP)
+ ld (hl),%110 ;change it into a pickup (with 2 HP)
ld a,18 ;reset enemies counter (18 hits = next)
pickupdone:
ld (pickuptimer),a ;save new enemiescounter value
ld (hl),$00 ;explosionFrame 0
ld hl,1 ;increase score by one
- call scoreInc
- jp (ix)
-
-hpleft:
- ld a,c ;pop occ
- sub %00000100 ;decrease HP by one
- ld (hl),a ;save
- jp (ix)
-
-nohit:
- pop hl
- inc hl
- inc hl
- inc hl
- inc hl
- djnz hit_enemies ;check next enemy
- ret
+ jp scoreInc ;+ret
-;--------------------------- handle torpedo -----------------------------------
+;--------------------------- handle torpedo ---------------------------------
Handle_torp:
ld a,(torp_occ)
ld e,a
ld ix,spr_bullett1
- push de
- call putsprite ;display torpedo
+ psh de
+ cal putsprite ;display torpedo
pop de
jp check_bullethits ;check for hits with enemies
ld (torp_occ),a
ret
-;--------------------------- level events -------------------------------------
+;--------------------------- level events -----------------------------------
Level_event:
ld hl,nextevent ;time to next event <ld a,(nextevent)
or a ;has it reached zero?
ret nz ;nope: get outta here!
- ld a,(eventtime) ;enemy frequency (lvl)
+ ld a,0 ;enemy frequency (lvl)
+eventtime =$-1
ld (nextevent),a ;set time to next event
ld hl,eventleft
dec (hl) ;update enemy-counter
or a ;has it reached 0?
jp z,Next_level ;yes: level finished
dec a ;has it reached 1?
- jr nz,do_event ;nope: wait for enemies to leave
+ jr z,standby_event ;yes: wait until no enemies present/left
+ dec a ;has it reached 2?
+ jr z,place_boss ;yep: place the BigBossTM!
+ dec a ;has it reached 3?
+ jr nz,do_event ;nope: >3 = place an enemy
inc hl ;nextevent located behind eventleft
- ld (hl),119 ;set delay
+ ld (hl),123 ;set delay
ret ;don't place any more enemies
-do_event:
- ld de,enemies-4
-chk_noenemy:
- inc de
- inc de
- inc de
- inc de
- ld a,(de)
- or a ;0 = no enemy present
- jr nz,chk_noenemy
+place_boss:
+ ld a,1
+ ld (nrlvlenemies),a ;just one enemy: the BOSS
+ ld hl,(levelp) ;the leveldata (including the boss)
+ dec hl ;points to leveldata\boss\enemynr
+ ld a,(hl) ;load it
+ ld (lvlenemies),a ;set new enemy (boss)
+ dec hl ;points to level\boss\movement
+ ld a,(hl) ;load
+ ld (level_move),a ;set boss movement
+ dec hl ;@level\boss\firefreq
+ ld a,(hl) ;load in a
+ ld (level_fire),a ;set firefrequency
+ jp do_event ;+ret
-place_enemy:
- ld a,(eventenemy) ;enemy type to place (lvl)
- ld hl,enemy00 ;enemy 1 specs
- add a,a ;a=type*2
- add a,a ;a=type*4
- ld c,a ;c=type
- ld b,0 ;bc = enemy nr.
- add hl,bc ;hl = enemy specs
+standby_event:
+ ld b,nrenemies
+ ld hl,enemies+1-enemysize
+ ld de,enemysize
+chk_enemyleft:
+ add hl,de
+ ld a,(hl)
+ or a ;0 = no enemy present
+ jr nz,enemyleft
+ dnz chk_enemyleft
+ ret
+enemyleft:
+ ld hl,eventleft
+ inc (hl)
+ ret
+
+
+do_event:
+ ld hl,enemies+1-enemysize
+ ld bc,enemysize
+ xor a ;a=0
+chk_noenemy:
+ add hl,bc
+ cp (hl) ;(hl) = 0 ??
+ jr nz,chk_noenemy ;jump if enemy present (non-0)
+ ex de,hl ;de=hl=usable enemy
+
+place_enemy:
+ ld bc,0 ;0..0
+nrlvlenemies =$-1 ;=nr of enemies minus 1
+ cal Random ;random enemy b..b+c = 0..nrenemies-1
+ ld b,0
+ ld c,a ;bc=a
+ ld hl,lvlenemies
+ add hl,bc ;go to a random enemy
+ ld a,(hl) ;load enemy nr of this mysterious random enemy
+ ld hl,XLenemyinfos-4 ;enemy "0" specs (1 before enemy #1)
+ add a,a ;a=type*2
+ add a,a ;a=type*4
+ ld c,a ;b=0; c=bc=type
+ add hl,bc ;hl = enemy specs
ld a,(hl) ;load hitpoints+occ of this enemy class
- ld (de),a ;occ
+ ld (de),a ;save occ
+
+ inc hl ;next enemyInfo byte
+ dec de ;goto hp
+ ld a,(hl) ;load hp64
+ ld (de),a ;save hp64
+ inc de ;next byte (or previous): occ again
inc hl ;next enemyInfo byte
inc de ;next byte of current enemy
- ld a,(hl) ;load movement+type of this enemy class
- ld (de),a ;enemy type
+ ld a,(hl) ;load enemy class (nr)
+ ld (de),a ;save enemy type
inc de ;set x-pos
- ld a,122 ;appear at right edge of screen (128-6)
- ld (de),a ;= x-position
+ cal find_sprite
+ ld a,128 ;appear at right edge of screen
+ sub (ix) ;minus the width of this enemy (not offscreen)
+ ld (de),a ;= x-position (save)
inc de ;set y-pos
inc hl ;where to place??
lure_enemy: ;2nd possibility: luring enemy
ld a,(y) ;place at same y-pos as YOUR ship
jr ypos_OK
-
random_enemy:
- call Random ;make a (in a) random value 0-255
- cp 51 ;y may not be more than 51
- jr c,ypos_OK ;OK if a<51
- and %00111111 ;a = 0..63
- sub 13 ;a = -13..50
- jr c,random_enemy ;not OK if a<0
-
+ ld bc,256*51 ;range=0..51
+ cal Random
ypos_OK: ;random value successfully created
ld (de),a ;save y-position
- ld hl,add2enemy-3 ;offset to xtra enemy info
- add hl,de ;hl points to <xtra info: move>
- ld (hl),1 ;set move-counter to 1
- inc hl ;hl to <xtra info: fire>
- ld (hl),1 ;set time-to-fire to 1 frame (fires directly)
- ret ;return
+ inc de ;set move
+ ld a,1 ;movecounter = 1
+ ld (de),a ;&&&(hl),1 better?
-Random:
- ld a,(RanPos) ;a handy random-var.
- ld hl,x ;add your x-coord for randomness
- adc a,(hl)
- ld hl,y ;add your y-coord for randomness
- adc a,(hl)
- ld (RanPos),a ;save altered random-var
- ret ;RanPos also in #a
+ inc de ;set fire
+ ld a,(level_info)
+ and %00000001 ;bit meaning directfire
+ jr nz,ffireOK ;(a=time-to-fire) = 1 frame (fires directly)
+ ld a,(level_fire) ;set ttf to normal nr of frames
+ffireOK:ld (de),a ;save fire
+ ret ;return
-;--------------------------- enemy fires --------------------------------------
+;--------------------------- enemy fires ------------------------------------
Enemy_fires: ;de = x,y
- push de
dec d
dec d ;d = x-2
inc e ;e = y+1
- ld b,nrebullets
+ ld b,nrebuls
ld hl,ebullets
find_ebullet:
ld a,(hl)
or a
jr z,found_ebullet ;0 = not used
inc hl \ inc hl \ inc hl
- djnz find_ebullet ;look next bullet
+ dnz find_ebullet ;look next bullet
ret
found_ebullet:
- ld (hl),1 ;use bullet &&&
+ ld b,%1100
+ ld a,(level_info)
+ and %00001000
+ jr z,bulletok
+
+ ld a,(y)
+ sub e
+ add a,10
+ jp p,bulletnotup
+ ld b,%1011 ;yourY-bulY = negative (=bullet below you)
+ add a,10
+ jp p,bulletnotup
+ ld b,%1001 ;yourY-bulY = even more negative (going up)
+
+bulletnotup:
+ sub 20
+ jp m,bulletok
+ ld b,%1010 ;bullet going down
+ sub 10
+ jp m,bulletok ;even more going down
+ ld b,%1000
+
+bulletok:
+ ld a,(level_info)
+ and %11110000
+ or b
+ ld (hl),a ;set bullet direction
inc hl
ld (hl),d ;set x-pos
inc hl
ld (hl),e ;set y-pos
- pop de
- ret
+ ret
-;----------------------------- enemy bullets ----------------------------------
+;----------------------------- enemy bullets --------------------------------
Enemy_bullets:
ld hl,ebullets
- ld b,nrebullets
+ ld b,nrebuls
handle_bullet:
- push bc
- push hl
+ psh bc
+ psh hl
ld a,(hl) ;load bulletType in a
- or a ;is it 0?
- jr nz,enemy_bullet ;no: handle bullet
+ and %1111 ;select direction-bits
+ jr nz,enemy_bullet ;non-0: handle bullet
next_bullet:
pop hl ;do not move the <pop hl>
pop bc
inc hl \ inc hl \ inc hl
- djnz handle_bullet
+ dnz handle_bullet
ret
enemy_bullet:
- ld b,a ;save type
+ ld b,a ;save type&%1111
inc hl ;bullet x
ld a,(hl) ;check if it has reached the left side of scrn
and %11111110 ;it is <2 (0 or 1)?
inc hl ;@y
ld a,b ;restore type
- dec a ;type 1?
- jr z,ebullet_common ;normal bullet
+ cp %1100 ;is it a normal bullet? (cp = faster than bit)
+ jr z,ebullet_common ;type %1100: normal bullet
+ and %111 ;isolate important bits
+ jr z,ebullet_down ;type %1000: moving down
+ dec a
+ jr z,ebullet_up ;type %1001: moving up
+ ld b,a
-ebullet_down:
ld a,(timer)
rra
jr c,ebullet_common
- inc (hl)
+
+ ld a,b
+ dec a
+ jr z,ebullet_down ;type %1010: moving down 50%
+ ;type %1011: moving up 50%
+ebullet_up:
+ ld a,(hl)
+ dec a
+ jp m,ebullet_common
+ ld (hl),a
+ jr ebullet_common
+
+ebullet_down:
+ ld a,(hl)
+ inc a
+ cp 55
+ jr z,ebullet_common
+ ld (hl),a
ebullet_common:
ld e,(hl) ;e=y
ld ix,spr_bullete1 ;display enemy bullet
- call putsprite
+ cal putsprite
ebullet_hits:
ld a,(your_occ)
jr nz,next_bullet ;0 = you're normal
pop hl
- push hl
+ psh hl
inc hl ;check x
ld a,(x)
sub (hl)
cp 9
jr nc,next_bullet
- call damage_you ;HIT!!
+ pop hl ;points to bullettype again
+ psh hl ;and save it again (ivm call to damage_you)
+ ld a,(hl) ;load bullettype
+ cal _shracc ;isolate damage-bits (%1111???? -> %00001111)
+ ld b,a ;set damage-amount
+ cal damage_you ;HIT!!
remove_ebullet:
pop hl ;hl could be destroyed by damage_you
ld (hl),0 ;bullet > unused
jr next_bullet+1 ;next bullet (SKIP THE <POP HL> = one byte)
-;--------------------------- handle enemies -----------------------------------
+;--------------------------- handle enemies ---------------------------------
Handle_enemies:
- ld hl,enemies
+ ld hl,enemies+1
ld b,nrenemies ;handle all enemies
handle_enemy:
- push bc
- push hl
+ psh bc
+ psh hl
ld a,(hl)
and %00000011
normal_enemy: ;occ "normal" 2 or "moving" 3
inc hl
- push hl
-
- ld e,(hl) ;e = enemy type
- ld c,e ;c = e
- ld d,0 ;de = e
- ld hl,sprites ;hl = @sprites offset-table
- add hl,de ;points to offset of current enemy offset
- ld e,(hl) ;de = @enemy offset
-
- ld ix,spr_enemy00 ;first enemy sprite
- add ix,de ;add offset for current enemy
- pop hl
+ ld c,(hl) ;c = enemy type = de
+ cal find_sprite
inc hl
ld a,(hl) ;x
ld e,(hl) ;y
ld a,b ;moving state was stored in b earlier
dec a ;is it 1?
- call nz,moving_enemy ;2 = moving enemy
+ cal nz,moving_enemy ;2 = moving enemy
+ ld (hl),e
dec hl ;@x
ld (hl),d ;store new x
ld a,c ;a = enemy type
jr firing_done ;continue
check_enemyfire:
- ld bc,add2enemy+1-2 ;offset of <xtra enemy info: fire>
- add hl,bc ;go there (@hl)
+ inc hl ;go to <y>
+ inc hl ;go to <move>
+ inc hl ;go to <fire>
dec (hl) ;decrease counter till next blast
- ld a,(hl) ;load new counter
+ ld a,(hl) ;&&&doesn't seem efficient to me
or a ;has it reached zero?
jr nz,firing_done ;finished if not
- add a,64 ;re-set counter for next blast
- ld (hl),a ;save
- call Enemy_fires ;fires bullet
-
+ ld a,(level_fire) ;re-set counter for next blast
+ ld (hl),a ;save time to fire
+ inc hl ;next byte = bullettype &&&
+ psh de ;save registers for firing-use
+ cal Enemy_fires ;fires bullet
+ pop de ;restore (destroyed by Enemy_fires)
firing_done:
- push de ;save registers for firing-use
- call putsprite ;display sprite @ix
- pop de ;restore (destroyed by putsprite)
+ cal putwidesprite ;display sprite @ix
next_enemy:
pop hl
- ld bc,$0004
+ ld bc,enemysize
add hl,bc
pop bc
- djnz handle_enemy
+ dnz handle_enemy
ret
remove_enemy:
pop hl
ld (hl),$0000 ;bye bye enemy
- push hl
- jr next_enemy
+ jr next_enemy+1 ;continue AFTER pop hl (already done)
exploding_enemy:
- inc hl
- push hl
- ld a,(hl)
- call explosion_stuff ;display explosion
- pop hl
-
+ inc hl
ld a,(hl)
- cp 15
+ cp 16
jr z,remove_enemy ;remove when at last frame
inc a
ld (hl),a ;next frame
+ cal explosion_stuff ;display explosion
jr next_enemy
-;--------------------------- moving enemies -----------------------------------
+;--------------------------- moving enemies ---------------------------------
moving_enemy:
-movetype_updown:
- ld bc,add2enemy
- add hl,bc
+ ld a,(level_move)
+ and a
+ jr z,movetype_updown ;type 0
+ dec a
+ jr z,movetype_vslow ;1
+ dec a
+ jr z,movetype_fast ;2
+ dec a
+ jr z,movetype_vfast ;3
+ dec a
+ jr z,movetype_smart ;4
+ dec a
+ jr z,movetype_lure ;5
+ dec a
+ jr z,movetype_slowlure ;6
+ dec a
+ jr z,movetype_stoplure ;7
+; dec a
+; jr z,movetype_fulllure ;8
+movetype_fulllure:
+ inc d
+ ld a,(timer)
+ and 1
+ ret z
+ cal movetype_lure
+ ld a,(x)
+ cp d
+ jr c,lure_left
+lure_right:
+ inc d
+ ret
+lure_left:
+ dec d
+ ret
+
+movetype_stoplure:
+ inc d
+ jr movetype_slowlure
+
+movetype_slowlure:
+ ld a,(timer)
+ and 1
+ ret z
+
+movetype_lure:
+ ld a,(y)
+ cp e
+ jr c,lure_up
+lure_down:
+ inc e
+ ret
+lure_up:
+ dec e
+ ret
+
+movetype_smart:
+ inc hl ;hl =@ <move>
+ ld a,(timer)
+ and %1111 ; |
+ ld a,(hl) ;&&& \|/
+ jr nz,smartupdate
+ inc a
+smartupdate:
+ ld (hl),a
+
+ or a ;reset carry flag
+ dec hl ;reset hl to <y>
+ and %11111100
+ jr z,movetype_fast
+
+movetype_vslow:
+ ld a,(timer)
+ and %11
+ ret z
+ inc d
+ ret
+
+movetype_fast:
+ ld a,(timer)
+ and %1
+ ret z
+movetype_vfast:
+ dec d ;move left
+ ret nz ;finished
+ pop hl ;restore stack (no ret used)
+ jp remove_enemy ;remove this enemy (off screen)
+
+movetype_updown:
+ inc hl ;@ <move>
ld a,(hl)
dec a
jr nz,move_updated
ld (hl),a
or a ;reset carry flag
- sbc hl,bc
+ dec hl ;@ <y>
and %00100000
+ ld a,(hl);&&&ld a,e ;load current y-position
jr z,movedown
-moveup:
- ld a,(hl) ;load y-position
- dec a ;decrease y-pos (=move up)
+moveup: dec a ;decrease y-pos (=move up)
ret m ;don't move off the screen (y<0)
- ld (hl),a ;save new y-pos
+ dec e ;save new y-pos
ret ;finish
movedown:
- ld a,(hl) ;load current y
inc a ;increase y-pos
cp 55 ;compare with bottom
ret nc ;return if it has passed that line (>40)
- ld (hl),a ;otherwise save new position
+ inc e ;otherwise save new position
ret ;and return
-;--------------------------- check collision ----------------------------------
+;--------------------------- check collision --------------------------------
Enemies_hit:
- ld de,(x) ;e = X, d = Y
- ld hl,enemies
+ ld hl,(x) ;e = X, d = Y
+ ld de,$0707 ;add 7 to both d and e
+ add hl,de
+ ld d,h
+ ld e,l ;e = X+7, d = Y+7
+
+ ld hl,enemies+1
ld b,nrenemies ;check all 20 enemies
check_collision:
- push hl
+ psh hl
ld a,(hl)
and %00000010
jr z,check_next ;2 or 3 = ok
inc hl
-collide_enemy:
-; push hl
-; push bc
-; ld hl,enemy00 ;enemy 1 specs
-; add a,a ;a=type*2
-; add a,a ;a=type*4
-; ld c,a ;c=type
-; ld b,0 ;bc = 4 * enemy nr.
-; add hl,bc ;hl = enemy specs
-; ld a,(hl) ;load size byte
-; pop bc
-; pop hl
-; ld c,a ;save size in c
+collide_enemy: ;&&& include in Handle_enemy proc
+ cal find_sprite
inc hl
ld a,(hl) ;check x match
- sub e ;enemy position minus yours
+ sub e ;enemy position minus yours minus 7
+ jp p,check_next
add a,6
+ add a,(ix) ;enemy width
jp m,check_next
- cp 12
- jr nc,check_next
inc hl
ld a,(hl) ;check y match
sub d ;same as with x-check
+ jp p,check_next
add a,6
+ add a,(ix+1) ;enemy height
jp m,check_next
- cp 12
- jr nc,check_next
dec hl
dec hl
take_pickup:
- ld a,(hl) ;load enemy type
-
- push hl ;we need hl
- ld hl,2 ;increase score by 2
- call scoreInc
- pop hl ;we're done
+ psh hl ;we need hl
+ ld hl,2 ;increase score by 2
+ cal scoreInc
+ pop hl ;we're done
+ ld a,(hl) ;load enemy type
or a
jr nz,collide ;enemy when <>0
- push hl
+ psh hl
ld hl,your_pickup ;your pickups
ld a,(hl) ;current
inc a ;go to next
ld a,1 ;yes: reset to pickup 1
not_maxpickup:
ld (hl),a ;save new
- call disp_icons ;display altered pickupicons
+ cal disp_icons ;display altered pickupicons
pop hl
dec hl ;to enemy occ
ld (hl),a ;remove
jr check_next ;all done, next..
+destroy_enemy:
+ ld (hl),%01 ;set to explode
+ inc hl
+ ld (hl),0 ;explosionFrame 0
+ jr collide_done
+
collide:
- xor a
- ld (hl),a ;explosionFrame 0
dec hl
- inc a
- ld (hl),a ;set to explode
- call damage_you ;auch!
+ ld a,(hl)
+ and %11111100
+ jr z,destroy_enemy
+ ld a,(hl)
+ sub collidedamage
+ ld (hl),a
+collide_done:
+ ld b,collidedamage ;damage
+ cal damage_you
check_next:
pop hl
+ ld a,b ;psh bc
+ ld bc,enemysize
+ add hl,bc
+ ld b,a ;pop bc
+ dnz check_collision
+ ret
+
+;--------------------------- story ------------------------------------------
+
+storyPage:
+ psh hl
+ cal _clrLCD
+ pop hl
+storyLine:
inc hl
+ ld e,(hl)
inc hl
+ ld d,(hl)
+ ld (_penCol),de
+ inc hl
+ cal _vputs
+
+ ld a,(hl)
+ dec a
+ jr z,storyLine
+
+ psh hl
+ ld hl,VIDEO_MEM ;copy text
+ ld de,GRAPH_MEM ;to GRAPH_MEM
+ ld bc,1024 ;entire screen
+ ldir
+ cal _clrLCD
+ pop hl
+
inc hl
+ ld a,(hl)
inc hl
- djnz check_collision
+ ld b,(hl)
+ psh hl
+ cal DoSFX
+ cal _getkey
+ pop hl
ret
-;--------------------------- update score -------------------------------------
+dostory:
+ cal storyPage ;do some story
+ inc hl ;look at next hl
+ ld a,(hl) ;load in a
+ dec hl ;restory hl
+ inc a ;set z-flag if a = $ff
+ jr nz,dostory ;otherwise loop
-scoreInc:
- push bc
- ld bc,(score)
- add hl,bc
- ld (score),hl
- pop bc
+ ld bc,5 ;story ends
+ add hl,bc ;set hl to beginning of the level
+ ld (levelp),hl ;set the level-pointer
+ ret ;and return
+
+;--------------------------- SFX --------------------------------------------
+
+DoSFX: ;in:a=beginLine;b=nrOfLines
+ ld (curline),a
+SFXframe:
+ psh bc
+
+ ld a,0 ;get line number
+curline =$-1
+ inc a ;go to the next line
+ ld (curline),a ;update
+
+ ld l,a
+ ld h,0 ;hl=a
+ add hl,hl
+ add hl,hl
+ add hl,hl
+ add hl,hl ;*16 (a pixels down=a*16)
+
+ ld b,h ;save hl for later
+ ld c,l
+
+ ld de,VIDEO_MEM ;where to put sfx
+ add hl,de ;go to ymin
+ ex de,hl ;put into de again
+
+ ld hl,GRAPH_MEM
+ add hl,bc ;hl->logo
+
+ sub 64 ;a=a-64
+ neg ;a=64-a (lines from bottom)
+
+; ld c,a ;c=a=(curline)
+; ld a,64
+; sub c ;lines from bottom
+
+SFXdisp: ;display this frame on screen
+ ld bc,16 ;one line (=16 bytes, you'd know by now)
+ ldir ;display (copy actually)
+ ld bc,-16 ;go up one line (not on screen)
+ add hl,bc ;so the same line will be displayed
+ dec a ;counter
+ jr nz,SFXdisp ;repeat until whole screen is displayed
+
+ ld b,8
+SFXdelay:
+ halt ;delay
+ dnz SFXdelay ;8x
+
+ pop bc ;counter
+ dnz SFXframe
ret
-;--------------------------- show icon ----------------------------------------
+;--------------------------- show icon --------------------------------------
-disp_icons:
- ld hl,VIDEO_MEM+(16*57);57 rows down = seven rows from bottom
- ld b,16*7 ;draw 16x (screen width) 7x (height)
- xor a ;blank line mask
-cleanline:
+drawline:
ld (hl),a ;draw one piece of the divider-line
inc hl ;move right (8 pixels = 1 byte)
- djnz cleanline ;repeat (16bytes * 7rows * 8pixels)
+ dnz drawline ;repeat (16bytes * 8pixels =128= screen width)
+ ret
+
+disp_icons:
+ psh bc \ psh de \ psh hl \ psh ix ;&&&
+
+ ld hl,VIDEO_MEM+(16*56);56 rows down = eight rows from bottom
+ ld (PutWhere),hl ;place icons at bottom of normal screen
+ ld b,16 ;draw 16x (screen width)
+ ld a,%11111111 ;horizontal line mask
+ cal drawline ;draw divider-line
- ld hl,VIDEO_MEM+(56*16)
- ld (PutWhere),hl
+ ld b,16*7 ;draw 16x (screen width) 7x (height)
+ xor a ;blank line mask
+ cal drawline ;clear scorebar
- call disp_lives
+ cal disp_lives
ld ix,spr_icon01 ;armorIcon
ld de,$1901 ;icon #1
- call putwidesprite ;display icon
- call disp_armor ;display value
+ cal putwidesprite ;display icon
+ cal disp_armor ;display bar
ld ix,spr_icon00
ld a,(torp_occ)
ld ix,spr_icon02 ;torpedoIcon
no_torp:
ld de,$2901 ;icon #2
- call putwidesprite ;display
+ cal putwidesprite ;display
- ld ix,spr_icon03 ;emptyIcon
+ ld ix,spr_icon00
+ ld a,(your_weapon) ;ur weapon
+ dec a ;1=laser
+ jr z,no_bullets
+ ld hl,$3945 ;position to display bullet-type digit
+ ld a,(your_weapon) ;digit
+ dec a ;minus one (1=laser)
+ ld (_penCol),hl ;set location
+ add a,'0' ;make digit
+ cal _vputmap ;display char
+ ld ix,spr_icon03 ;bulletIcon
+no_bullets:
ld de,$3901 ;icon #3
- call putwidesprite
+ cal putwidesprite ;display icon
ld ix,spr_icon00 ;emptyIcon
- ld a,(your_laser)
- or a
- jr z,no_laser
+ ld a,(your_weapon)
+ dec a
+ jr nz,no_laser
ld ix,spr_icon04 ;laserIcon
no_laser:
ld de,$4901 ;icon #4
- call putwidesprite
+ cal putwidesprite
ld ix,spr_icon00 ;emptyIcon
ld a,(your_multiples)
ld ix,spr_icon05
no_multiples:
ld de,$5901 ;icon #5
- call putwidesprite
+ cal putwidesprite
- ld ix,spr_icon03
+ ld ix,spr_dividerline
ld de,$6901
- call putwidesprite
+ cal putwidesprite
ld a,(your_pickup) ;pickups taken
- add a,a ;picks*2
- ret z ;return if no pickups
+ add a,a ;picks*2 (sets z-flag)
+ jr z,iconsdone ;return if no pickups
add a,a ;picks*4
add a,a ;picks*8
add a,a ;picks*$10
ld e,$01 ;x-pos = bottom (1a01,2a01,3a01,4a01,5a01)
ld ix,spr_icon
- call putwidesprite
+ cal putwidesprite
+iconsdone:
+ ld hl,GRAPH_MEM ;normal game-screen
+ ld (PutWhere),hl ;set sprite-position to normal screen
+
+ pop ix \ pop hl \ pop de \ pop bc
ret
disp_armor:
- ld hl,$3925 ;Display Armor left
- ld (_penCol),hl ;place @ armorIcon
- ld a,(your_armor) ;load armor left
- add a,'0' ;make digit
- call _vputmap ;display char
+ ld hl,(57*16)+VIDEO_MEM+3
+ ld b,3
+armorbarclr:
+ dec hl
+ ld (hl),0
+ dnz armorbarclr
+
+ ld a,(your_armor) ;load your armor
+ ld c,a ;psh a
+ srl a ;/2
+ srl a ;/4
+ srl a ;/8: don't display last 3 bits of a (later)
+ jr z,noarmorbar ;if a=0 then it would loop 256x so skip it
+ ld b,a ;loop b=a times
+armorbar: ;starting at ($39*16)+VIDEO_MEM
+ ld (hl),%11111111 ;draw a piece of the bar
+ inc hl ;next position
+ dnz armorbar ;loop it b times
+
+noarmorbar:
+ ld a,c ;pop a
+ and %111 ;display last bits of armor
+ ret z ;if armor=0 then bit = %00000000 (don't disp)
+ ld b,a ;into B
+ xor a ;bit = %00000000
+armorbarbit:
+ scf ;set carry flag
+ rra ;rotates A right and sets bit 7 (c-flag)
+ dnz armorbarbit ;repeat B times (so if B=6 then a=%11111100)
+armorbarready: ; (an if B=3 then a=%11100000)
+ ld (hl),a ;draw this last byte
+ ret
+
+disp_charge:
+ ld hl,(58*16)+VIDEO_MEM+3
+ ld b,3
+chargebarclr:
+ dec hl
+ ld (hl),0
+ dnz chargebarclr
+ ld a,(weapincs) ;load bar size (0-80)
+ srl a ;half the size (0-40)
+ srl a ;again half that size (0-20 pixels)
+ ld c,a ;psh a
+ srl a ;/2
+ srl a ;/4
+ srl a ;/8: don't display last 3 bits of a (later)
+ jr z,nochargebar ;if a=0 then it would loop 256x so skip it
+ ld b,a ;loop b=a times
+chargebar: ;starting at ($39*16)+VIDEO_MEM
+ ld (hl),%11111111 ;draw a piece of the bar
+ inc hl ;next position
+ dnz armorbar ;loop it b times
+nochargebar:
+ ld a,c ;pop a
+ and %111 ;display last bits of chargebar
+ ret z ;if armor=0 then bit = %00000000 (don't disp)
+ ld b,a ;into B
+ xor a ;bit = %00000000
+chargebarbit:
+ scf ;set carry flag
+ rra ;rotates A right and sets bit 7 (c-flag)
+ dnz chargebarbit ;repeat B times (so if B=6 then a=%11111100)
+chargebarready: ; (an if B=3 then a=%11100000)
+ ld (hl),a ;draw this last byte
ret
disp_lives:
- ld hl,$3900 ;display Lives
+ ld hl,$3A00 ;display Lives
ld (_penCol),hl ;bottom left
ld hl,savestr+2
ld (hl),'L'
ld (hl),'x'
inc hl
- ld a,(lives) ;nr of lives in a
+ ld a,(your_lives) ;nr of lives in a
add a,'0' ;make digit
ld (hl),a
dec hl \ dec hl
- call _vputs ;display on screen
+ jp _vputs ;display on screen +ret
+
+;--------------------------- proc -------------------------------------------
+
+Random: ;a=c<random<b+c; destr:none
+ ld a,r
+ add a,0 ;increase last value by 0-255 (r)
+ranseed =$-1
+ ld (ranseed),a ;save for next time
+ cp b ;a>=b
+ jr nc,Random ;then add again
+ add a,c ;a<b; a=a+c
ret
-;--------------------------- game over / new game / death ---------------------
-own_name:
- .db $12,7,"nemesis"
+RandomY: ;HL = random Y 0..50 right side ((1..51)*16-1)
+ psh bc
+ ld bc,1+50*256 ;range=1..51
+ cal Random ;a = 1..51
+ ld h,0
+ ld l,a ;hl = 1..51
+ add hl,hl
+ add hl,hl
+ add hl,hl
+ add hl,hl ;hl = 1..51 * 16 (left side at random y)
+ dec hl ;hl = 0..50 * 16 (" at right side of screen)
+ ld de,GRAPH_MEM
+ add hl,de ;position on screen
+ pop bc
+ ret
-save_hi:
- ld hl,own_name ; Find own variable
- xor a
- call _ABS_MOV10TOOP1
- call _FINDSYM
- ret c ; If not found, give up
-
- ld a,b ; Save the stored section
- ld h,d
- ld l,e
- ld b,0
- ld de,4+stored_data_start-_asm_exec_ram
- add hl,de
- adc a,b
- call _SET_ABS_DEST_ADDR
- ld a,0
- ld hl,stored_data_start
- call _SET_ABS_SRC_ADDR
- ld hl,stored_data_end-stored_data_start
- call _SET_MM_NUM_BYTES
- call _mm_ldir
+scoreInc:
+ psh bc
+ ld bc,(your_score)
+ add hl,bc
+ ld (your_score),hl
+ pop bc
+ ret
+
+find_sprite: ;in:hl=enemy+type | out:ix=sprite to enemy
+ psh de
+ psh hl
+ ld e,(hl) ;e = enemy offset/2
+ ld d,0 ;de = e
+ ld ix,spr_enemy00 ;first enemy sprite
+ add ix,de ;add offset for current enemy
+ add ix,de ;twice (offset stored as offset/2)
+ pop hl
+ pop de
+ ret
+BLACKLCD:
+ ld hl,VIDEO_MEM ;screen location (top left)
+ ld de,VIDEO_MEM+1
+ ld (hl),%11111111
+ ld bc,1024-1 ;do it 1024 times = entire screen
+ ldir
+ set 3,(iy+5) ;set white on black
ret
-game_over:
- pop hl ;=ret (game_over was called from a procedure)
-game_over_nopop:
- call _clrLCD ;clear screen
+releasekeys:
+ halt
+ ld a,%10000000 ;all key-masks
+ out (1),a
+ in a,(1)
+ inc a ;cp %11111111 (no keys pressed)
+ jr nz,releasekeys ;keep waitin
+ cal GET_KEY ;clear buffer
+ ret
+
+;--------------------------- game over / new game / death -------------------
+chartable:
+ .db 0,".<>!",0,0,0,0 ;down,L,R,up
+ .db 0,"xtoje0",0 ;enter..clear
+ .db " wsnid9",0 ;(-)..custom
+ .db "zvrmhc8",0 ;dot..del
+ .db "yuqlgb7#" ;0..xvar
+ .db $D9,"-pkfa6'" ;on..alpha
+ .db "54321*",0,$D0 ;F5..more
+
+save_hi:
+ ld hl,_asapvar ;find own variable
+ rst 20h ;cal _ABS_MOV10TOOP1
+ rst 10h ;cal _FINDSYM
+ ret c ;not found? who cares...
+
+ xor a
+ ld hl,4+storehi_start-_asm_exec_ram
+ add hl,de ;hl=pointer to data in original prog
+ adc a,b
+ cal _SET_ABS_DEST_ADDR
+ xor a
+ ld hl,storehi_start
+ cal _SET_ABS_SRC_ADDR
+ ld hl,storehi_end-storehi_start
+ cal _SET_MM_NUM_BYTES
+ cal _mm_ldir ;save done (cal \ ret)
+ jp _RAM_PAGE_1
+
+save_lvl:
+ ld hl,_asapvar ;find own variable
+ rst 20h ;cal _ABS_MOV10TOOP1
+ rst 10h ;cal _FINDSYM
+ ret c ;not found? who cares...
+
+ xor a
+ ld hl,4+storesave_start-_asm_exec_ram
+ add hl,de ;hl=pointer to data in original prog
+ adc a,b
+ cal _SET_ABS_DEST_ADDR
+ xor a
+ ld hl,storesave_start
+ cal _SET_ABS_SRC_ADDR
+ ld hl,storesave_end-storesave_start
+ cal _SET_MM_NUM_BYTES
+ cal _mm_ldir ;save done (cal \ ret)
+ jp _RAM_PAGE_1
+
+game_over: ;stack=+0
+ cal BLACKLCD ;clear screen
ld hl,$0603
ld (_curRow),hl ;center
ld hl,txt_gameover
- call _puts ;display "GAME OVER"
+ cal _puts ;display "GAME OVER"
+ cal releasekeys ;wait for all keys to be released
+
+ ld hl,$0007
+ ld (_curRow),hl
+
+ ld de,(your_score)
+ ld hl,(hiscore)
+ cal CP_HL_DE
+ jr nc,no_hiscore
+ ld (hiscore),de
+
+ask_hiname:
+ ld ix,hiname
+ ld a,9
+ ld (hiscorepos),a
+enter_name_loop:
+ ld a,'_'
+ cal _putc
+ ld hl,_curCol
+ dec (hl)
+nokeypressed:
+ halt \ halt
+ cal GET_KEY
+ or a
+ jr z,nokeypressed
+
+ cp K_DEL
+ jr z,backup
+ cp K_ENTER
+ jr z,nomore
+ cp K_EXIT
+ jr z,nomore
+
+ ld hl,hiscorepos
+ ld b,(hl)
+ dec b
+ jr z,nokeypressed
+ ld (hl),b
+
+ ld hl,chartable
+ ld e,a
+ ld d,0
+ add hl,de
+ ld a,(hl)
+ or a
+ jr z,nokeypressed
+
+ ld (ix),a
+ cal _putc
+ inc ix
+ cal releasekeys
+ jr enter_name_loop
+
+backup:
+ ld hl,hiscorepos
+ ld a,(hl)
+ cp 9
+ jr nc,nokeypressed
+ inc (hl)
+
+ dec ix
+ ld (ix),' '
+ ld a,32
+ cal _putc
+ ld hl,_curCol
+ dec (hl)
+ dec (hl)
+ jr enter_name_loop
+
+nomore:
+ ld a,' '
+ cal _putc
+ ld (ix),0
+ cal save_hi
+ jr hiscoredone
+
+no_hiscore:
+ ld hl,hiname
+ cal _puts
+
+hiscoredone:
+ xor a ;clear a (Ahl will be displayed)
+ ld hl,$1006 ;bottom-1 right
+ ld (_curRow),hl ;set
+ ld hl,(your_score) ;your score
+ cal _dispahl ;display it (a=0)
- xor a ;clear a (AHL will be displayed)
- ld hl,$1006 ;bottom-1 right
- ld (_curRow),hl ;set
- ld hl,(score) ;your score
- call _dispahl ;display it (a=0)
ld hl,$314b ;bottom-1 right before score ^^
ld (_penCol),hl ;set
ld hl,txt_score ;"Score"
- call _vputs ;display (small)
+ cal _vputs ;display (small)
- ld hl,$1007 ;bottom right
- ld (_curRow),hl ;set
- ld hl,(hiscore) ;hi-score
- call _dispahl ;display
+ ld hl,$1007 ;bottom right
+ ld (_curRow),hl ;set
+ ld hl,(hiscore) ;hi-score
+ cal _dispahl ;display
ld hl,$3946 ;bottom right before hiscore ^^
ld (_penCol),hl ;set
ld hl,txt_hiscore ;"Hiscore"
- call _vputs ;display (small)
-
- ld de,(score)
- ld hl,(hiscore)
- call CP_HL_DE
- jr nc,no_hiscore
- ld (hiscore),de
+ cal _vputs ;display (small)
+ res 3,(iy+5)
-no_hiscore:
- call save_hi
+ ld b,16
+ ld de,16
+ ld hl,VIDEO_MEM+(49*16)-1
+restore_line:
+ set 1,(hl)
+ add hl,de
+ dnz restore_line
- ld b,$20
-wait2: halt \ halt
- djnz wait2 ;delay
- call _getkey ;wait for keypress
+ cal _getkey ;wait for keypress
jp quit ;restore some things and return to TI-OS/shell
-New_game:
- xor a ;score 0
- ld (score),a ;reset score
- ld (score+1),a ;reset score
- inc a ;level #1
- ld (level),a ;reset level nr
- ld hl,level01 ;set level pointer to level#1
- ld (levelp),hl ;reset level pointer
- ld hl,lives ;starting lives
- ld (hl),4 ;3 lives (will be decreased @ You_die)
-
-You_die:
- ld hl,lives
- dec (hl) ;decrease lives
- ld a,(hl) ;load lives left
- inc a ;if lives=0ffh then a=0
- jr z,game_over ;if so, game's over
-
- xor a ;a=0
- ld (your_armor),a ;no armor
+New_game: ;stack must be +1 (so change the jp in cal :)
+ xor a ;ld a,0
+ ld (your_score),a ;reset score
+ ld (your_score+1),a ;reset score (0)
ld (torp_occ),a ;no torpedoes
- ld (your_laser),a ;no laser
+ ld (your_weapon),a ;no laser
ld (your_pickup),a ;reset pickups
ld (your_multiples),a ;no multiples
- jr nonext_level
-
-;--------------------------- next level ---------------------------------------
+ inc a ;ld a,1
+ ld (level),a ;reset level nr (#1)
+ ld hl,level00 ;set level pointer to level#1
+ ld (levelp),hl ;reset level pointer
+ inc a ;ld a,2
+ ld (your_weapon),a ;default weapon
+ ld a,4
+ ld (your_lives),a ;3 lives (4 will be decreased @ You_die)
+ ld (pickuptimer),a ;next pickup after 4 enemies destroyed
+
+You_die: ;stack must be +1
+ pop hl ;restore stack
+ ld a,12
+ ld (your_armor),a ;12 HPs/shields
+ ld a,(your_lives) ;load lives left
+ dec a ;decrease lives
+ ld (your_lives),a ;if lives=0ffh GO
+ inc a ;if -1 then zf set now
+ jp z,game_over ;and game's over
+ jr samelevel
+
+;--------------------------- next level -------------------------------------
+
+Next_level: ;stack must be +1
+ pop hl
+ ld a,(your_armor) ;load current armor
+ cp 25-8 ;may not become >=25
+ jr c,addok ;ok then just add 8
+ ld a,25-8 ;set to maximum (8 will be added below)
+addok:
+ add a,8 ;add 8 to armor
+ ld (your_armor),a ;change armor
-Next_level:
ld hl,level ;level number
ld a,(hl)
inc a
ld (hl),a
- ld hl,(levelp) ;level pointer
- inc hl
- inc hl
- inc hl ;update to point to next level
- ld (levelp),hl ;save
-
+ add a,a
+ add a,a
ld h,0 ;increase score....
- ld l,a ;by level number
+ ld l,a ;by level number * 4
ld bc,20
add hl,bc ;plus 20
- call scoreInc ;update score
+ cal scoreInc ;update score
-nonext_level:
+ ld hl,(levelp) ;level pointer
+ ld c,0 ;advance one level
+ ld b,(hl)
+ add hl,bc ;passed the enemies
+ ld b,7+32+2
+ add hl,bc ;update to point to next level
+ ld (levelp),hl ;save
+
+samelevel:
ld a,80
ld (nextevent),a ;time to first enemy appearance
ld hl,(levelp) ;level pointer
- ld a,(hl) ;load new level-enemy type
- ld (eventenemy),a ;set level-enemy
+ xor a
+ cp (hl)
+ cal z,dostory
+
+ ld a,(hl) ;number of (different) enemies in this level
inc hl
+ ld c,a
+ ld (nrlvlenemies),a ;set nr of enemies-1
+ ld b,0 ;bc=c so we can use ldir
+ ld de,lvlenemies ;table of enemies
+ ldir ;load enemies to table
ld a,(hl) ;load new appearance-time
ld (eventtime),a ;set
inc hl
ld a,(hl) ;load nr of enemies in this level
ld (eventleft),a ;set nr of events left
+ inc hl
+ ld a,(hl)
+ ld (level_info),a ;
+ inc hl
+ ld a,(hl) ;movement of enemies in this level
+ ld (level_move),a ;do it
+ inc hl
+ ld a,(hl) ;how frequent the enemies fire a bullet
+ ld (level_fire),a ;consider it done
+
+ inc hl
+ ld de,spacespace
+ ld c,17+17+2 ;b=0
+ ldir
+
+ ld ix,starx1
+ ld b,nrstars1
+ cal placestars
+ ld ix,starx2
+ ld b,nrstars2
+ cal placestars
xor a
ld (timer),a ;reset time
ld hl,your_occ ;hl = your_occ
ld (hl),a ;reset your ship (not exploding)
inc hl ;hl = your_inv
- ld (hl),50 ;set 50 frames invulnerable
- ld hl,x ;begin position x=...
- ld (hl),a ;...=a=0=left
- inc hl ;y=...
- ld (hl),24 ;...=24=middle
+ ld (hl),25 ;set 25*4=100 frames invulnerable
+ ld de,$1800
+ ld (x),de ;begin position (x,y)
+ cal Place_multiples ;place all multiple-positions at that (0,24)
ld a,(torp_occ)
or a ;no torpedoes?
ld a,1 ;if so, set to "ready to fire" (=1)
torpsclear:
- ld de,$0018 ;x=0, y=24 (like you..)
- call Place_multiples ;place all multiple-positions at (0,24)
-
- ld hl,ybullets ;clear your/enemy bullets
- ld (hl),a ;clear first byte
- ld de,ybullets+1 ;and copy this byte to the next byte
- ld bc,(nrybullets+nrebullets)*3-1 ;bc times (all bullets)
- ldir
+ ld hl,enemies ;remove all enemies and bullets
+ ld (hl),0 ;clear first byte
+ ld de,enemies+1 ;copy this to the next byte
+ ld bc,(nrenemies*enemysize)+(nrybuls*4)+(nrebuls*3)-1
+ ldir ;clear enemies + bullets (y/e)
- ld hl,enemies ;and remove all enemies as well
- ld (hl),a ;clear first byte
- ld de,enemies+1 ;point to the next
- ld bc,add2enemy+nrenemies*2 ;clear enemy-info + enemiesxtra
- ldir
-
-;--------------------------- setup game ---------------------------------------
+;--------------------------- setup game -------------------------------------
game_setup:
- call _clrLCD ;clear screen
- ld a,%10111011
- ld hl,VIDEO_MEM ;screen location (top left)
- ld b,0 ;b = 0 (loop 0-1 = 0FFh = 256 times)
-clearloop2:
- inc a
- ld (hl),a ;clear four times (total = 256*4 = 1024 bytes)
- inc hl
- ld (hl),a
- inc hl
- xor $ff
- ld (hl),a
- inc hl
- ld (hl),a
- inc hl
- xor $ff
- djnz clearloop2 ;repeat 256x
-
- ld hl,$0703
- ld (_curRow),hl ;center
+ cal BLACKLCD ;white on black
ld hl,txt_level
- call _puts ;display "LEVEL "
+ ld de,$0703
+ ld (_curRow),de ;center
+ cal _puts ;display "LEVEL "
- ld a,(level)
+ ld a,(level) ;current level
ld l,a
- ld h,$00
-
- call UNPACK_HL
- add a,'0'
- ld b,a
- call UNPACK_HL
- add a,'0'
- call _putc ;display second digit
+ ld h,0 ;in hl
+ cal UNPACK_HL ;create first digit
+ add a,'0' ;0-9
+ ld b,a ;into b
+ cal UNPACK_HL ;second digit
+ add a,'0' ;0-9
+ cal _putc ;display second digit
ld a,b
- call _putmap ;display first digit
+ cal _putmap ;display first digit
- ld hl,$0904
- ld (_curRow),hl ;display lives left below level nr
ld hl,txt_lives ;bar text: "Lx0"...
- ld a,(lives) ;lives left
- add a,'0' ;make value
- ld (txt_lives+3),a ;add to text
- call _puts ;display the string
-
- ld b,$20
-wait: halt \ halt
- djnz wait ;delay
- call _getkey ;wait for keypress
+ ld de,$0904
+ ld (_curRow),de ;display lives left below level nr
+ cal _puts
+ ld a,(your_lives) ;lives left
+ add a,'0' ;make value 0='0'
+ cal _putc
+
+ cal releasekeys ;wait for user to release all keys
+ ld hl,txt_savekey ;"Press [F1] to save"
+ ld de,$3A46 ;bottom-right
+ ld (_penCol),de
+ cal _vputs
+
+ res 3,(iy+5) ;set white on black
+ cal _getkey ;wait for keypress
+ cp kF1
+ cal z,save_lvl
+
+ cal _clrLCD ;clear screen
+ cal disp_icons ;display bottom icons +ret
+ jp game_main_loop
+
+placestars:
+ cal RandomY ;a = random y-pos 1..bottom
+ ld a,b ;a = b = star nr. = 1..7
+ add a,a ;a = 2b = 2..14
+ ld d,0
+ ld e,a ;de = a = 2-14
+ or a
+ sbc hl,de ;substract from random y => random pos anywhere
- call _clrLCD ;clear screen
- call disp_icons ;display bottom icons
+ ld (ix),l ;save x-pos (l)
+ ld (ix+1),h ;save y-pos (h)
+ inc ix \ inc ix ;next star
+ dnz placestars ;repeat for all stars
+ ret
- ld hl,VIDEO_MEM+(16*56);56 rows down = eight rows from bottom
- ld b,16 ;draw 16x (screen width)
- ld a,%11111111 ;horizontal line mask
-drawline:
- ld (hl),a ;draw one piece of the divider-line
- inc hl ;move right (8 pixels = 1 byte)
- djnz drawline ;repeat (16bytes * 8pixels =128= screen width)
- ret
+loadweapon:
+ ld a,(your_weapon)
+ add a,a ;weap*2
+ add a,a ; *4
+ add a,a ; *8
+ ld c,a
+ ld b,0
+ ld hl,weapondata-16
+ add hl,bc
+ ld a,(hl)
+ ld (weapdamage),a ;damage of bullets
+ inc hl
+ ld a,(hl)
+ ld (weapdaminc),a ;damage increase
+ ret
-;--------------------------- putsprite ----------------------------------------
-;--------------------------- de =(X,Y) ----------------------------------------
+;--------------------------- putsprite --------------------------------------
+;--------------------------- de =(X,Y) --------------------------------------
offsets_table:
- .db 128,64,32,%10000,%01000,%00100,%00010,%00001
+ .db $80,$40,$20,$10,8,4,2,1
putsprite:
ld a,d ;a = X
and %00000111 ;a = X mod 8 = bit nr. to mask
inc b ;a>255 so increase bc by 256
_n1: ld c,a ;c = (Y*16+X/8) mod 256
add hl,bc ;bc = Y*16+X/8
-
+
ld d,(ix)
ld b,(ix+1)
-_oloop: push bc ;Save # of rows
- push hl ;Save screen address
+_oloop: psh bc ;Save # of rows
+ psh hl ;Save screen address
ld b,d ;Load width
ld c,(ix+2) ;Load one line of image
inc ix
jr nc,_notedge ;Test if edge of byte reached
inc hl ;Go to next byte
_notedge:
- djnz _iloop
+ dnz _iloop
pop hl ;Restore address
ld bc,16 ;Go to next line
add hl,bc
pop bc ;Restore data
- djnz _oloop
- ret
+ dnz _oloop
+ ret ;<jp>s are used instead of <jr> = faster
-;--------------------------- putbigsprite -------------------------------------
+;--------------------------- putbigsprite -----------------------------------
putwidesprite:
- ld a,d
- and 7
- ld hl,offsets_table
- ld c,a
- ld b,0
- add hl,bc
- ld a,(hl)
- ld (wsmc1+1),a
- ld (wsmc2+1),a
- ld hl,(PutWhere)
-
- ld a,e
- add a,a
- add a,a
- add a,a
-
- rl b
- add a,a
- rl b
- srl d
- srl d
- srl d
- add a,d
- jr nc,n1
- inc b
-n1: ld c,a
- add hl,bc
-
- ld d,(ix)
- ld b,(ix+1)
-woloop: push bc ;Save # of rows
- push hl ;Save screen address
- ld b,d ;Load width
- ld c,(ix+2) ;Load one line of image
- inc ix
-wsmc1: ld a,1 ;Load pixel mask
-wiloop: sla c ;Test leftmost pixel
- jr nc,wnoplot ;See if a plot is needed
- ld e,a ;OR pixel with screen
- or (hl)
- ld (hl),a
- ld a,e
+ ld a,d
+ and 7
+ ld hl,offsets_table
+ ld c,a
+ ld b,0
+ add hl,bc
+ ld a,(hl)
+ ld (wsmc1+1),a
+ ld (wsmc2+1),a
+ ld hl,(PutWhere)
+
+ ld a,e
+ add a,a
+ add a,a
+ add a,a
+
+ rl b
+ add a,a
+ rl b
+ srl d
+ srl d
+ srl d
+ add a,d
+ jr nc,n1
+ inc b
+n1: ld c,a
+ add hl,bc
+
+ ld d,(ix)
+ ld b,(ix+1)
+woloop: psh bc ;Save # of rows
+ psh hl ;Save screen address
+ ld b,d ;Load width
+ ld c,(ix+2) ;Load one line of image
+ inc ix
+wsmc1: ld a,1 ;Load pixel mask
+wiloop: sla c ;Test leftmost pixel
+ jr nc,wnoplot ;See if a plot is needed
+ ld e,a ;OR pixel with screen
+ or (hl)
+ ld (hl),a
+ ld a,e
wnoplot:
rrca
- jr nc,wnotedge ;Test if edge of byte reached
- inc hl ;Go to next byte
+ jr nc,wnotedge ;Test if edge of byte reached
+ inc hl ;Go to next byte
wnotedge:
-wsmc2: cp 1
- jr z,wover_1
-
- djnz wiloop
- pop hl ;Restore address
- ld bc,16 ;Go to next line
- add hl,bc
- pop bc ;Restore data
- djnz woloop
+wsmc2: cp 1
+ jr z,wover_1
+
+ dnz wiloop
+ pop hl ;Restore address
+ ld bc,16 ;Go to next line
+ add hl,bc
+ pop bc ;Restore data
+ dnz woloop
ret
wover_1:
- ld c,(ix+2)
- inc ix
- djnz wiloop
- dec ix
- pop hl
- ld bc,16
- add hl,bc
- pop bc
- djnz woloop
+ ld c,(ix+2)
+ inc ix
+ dnz wiloop
+ dec ix
+ pop hl
+ ld bc,16
+ add hl,bc
+ pop bc
+ dnz woloop
ret
-;------------------------------------------------------------------------------
-;------------------------------- sprites --------------------------------------
-;------------------------------------------------------------------------------
-
-spr_ship:
- .db 9,1 ;ship icon
- .db %11100000 ; ███
- .db %01111000 ; ████
- .db %00111110 ; █████
- .db %01111001 ; ████ █
- .db %01111001 ; ████ █
- .db %01111001 ; ████ █
- .db %00111110 ; █████
- .db %01111000 ; ████
- .db %11100000 ; ███
+;----------------------------------------------------------------------------
+;------------------------------- sprites ------------------------------------
+;----------------------------------------------------------------------------
spr_ship01:
.db 7,7 ;ship alpha class
- .db %01111000 ; ████
- .db %11100000 ; ███
- .db %11111100 ; ██████
- .db %11110010 ; ████ █
- .db %11111100 ; ██████
- .db %11100000 ; ███
- .db %01111000 ; ████
+ .db %01111000 ; ████
+ .db %11100000 ;███
+ .db %01111100 ; █████
+ .db %11110010 ;████ █
+ .db %01111100 ; █████
+ .db %11100000 ;███
+ .db %01111000 ; ████
spr_ship01i:
- .db 7,7 ;ship alpha class
- .db %01010000 ; █ █
- .db %10100000 ; █ █
- .db %01010100 ; █ █ █
- .db %10100010 ; █ █ █
- .db %01010100 ; █ █ █
- .db %10100000 ; █ █
- .db %01010000 ; █ █
+ .db 8,7
+ .db %01111010 ; ████ █
+ .db %11100001 ;███ █
+ .db %01111101 ; █████ █
+ .db %11110011 ;████ ██
+ .db %01111101 ; █████ █
+ .db %11100001 ;███ █
+ .db %01111010 ; ████ █
spr_ship02:
.db 7,7 ;ship beta class
- .db %11100000 ; ███
+ .db %11100000 ;███
+ .db %11110000 ;████
+ .db %01111100 ; █████
+ .db %01110010 ; ███ █
+ .db %01111100 ; █████
+ .db %11110000 ;████
+ .db %11100000 ;███
+spr_ship02i:
+ .db 8,7
+ .db %11100010 ;███ █
+ .db %11110001 ;████ █
+ .db %01111101 ; █████ █
+ .db %01110011 ; ███ ██
+ .db %01111101 ; █████ █
+ .db %11110001 ;████ █
+ .db %11100010 ;███ █
+
+spr_ship03:
+ .db 7,7 ;ship gamma class
+ .db %11111000 ;█████
+ .db %01100000 ; ██
+ .db %11111100 ;██████
+ .db %11100110 ;███ ██
+ .db %11111100 ;██████
+ .db %01100000 ; ██
+ .db %11111000 ;█████
+spr_ship03i:
+ .db 8,7
+ .db %11111010 ;█████ █
+ .db %01100001 ; ██ █
+ .db %11111101 ;██████ █
+ .db %11100111 ;███ ███
+ .db %11111101 ;██████ █
+ .db %01100001 ; ██ █
+ .db %11111010 ;█████ █
+
+spr_ship04:
+ .db 7,7 ;ship delta class
+ .db %11000000 ; ██
.db %11110000 ; ████
- .db %01111100 ; █████
- .db %01110010 ; ███ █
- .db %01111100 ; █████
+ .db %11111100 ; ██████
+ .db %01100010 ; ██ █
+ .db %11111100 ; ██████
.db %11110000 ; ████
- .db %11100000 ; ███
-spr_ship02i:
- .db 7,7 ;ship beta class
- .db %01000000 ; █
- .db %10100000 ; █ █
- .db %01010100 ; █ █ █
- .db %00100010 ; █ █
- .db %01010100 ; █ █ █
- .db %10100000 ; █ █
- .db %01000000 ; █
+ .db %11000000 ; ██
+spr_ship04i:
+ .db 8,7
+ .db %11000010 ; ██ █
+ .db %11110001 ; ████ █
+ .db %11111101 ; ██████ █
+ .db %01100011 ; ██ ██
+ .db %11111101 ; ██████ █
+ .db %11110001 ; ████ █
+ .db %11000010 ; ██ █
spr_multiple:
- .db 6,4 ;multiples
+ .db 6,5 ;multiples
.db %01111000 ; ████
- .db %11111100 ; ██████
- .db %11111100 ; ██████
+ .db %11001100 ; ██ ██
+ .db %10000100 ; █ █
+ .db %11001100 ; ██ ██
.db %01111000 ; ████
-spr_bullet01:
- .db 5,3 ;your bullets
- .db %00110000 ; ░▒▓█▒
- .db %11111000 ; ░▒▓████▒
- .db %00110000 ; ░▒▓█▒
-spr_bullet02:
- .db 5,3
- .db %11110000 ; ░▒▓███▒
- .db %11111000 ; ░▒▓████▒
- .db %11110000 ; ░▒▓███▒
-spr_bullett1:
- .db 4,3 ;▒▒▒
- .db %11100000 ;▒███
- .db %11110000 ; ████
- .db %01110000 ; ███
+;-------------------------------- explosion ---------------------------------
-spr_bullete1:
- .db 4,3 ;enemy bullets
- .db %01100000 ; ▒█▓▒░
- .db %11110000 ; ▒███▓▒░
- .db %01100000 ; ▒█▓▒░
-
-;---------------------------------------- explosion -------------------------------------------
-
-spr_explosion:
+spr_explosion:
.db 8,6 ;1
.db %00000000
.db %00011100 ; ███
.db %00000010 ; █▒
.db %00100100 ; █▒ █
-;--------------------------------------- bar -----------------------------------
+spr_yexplosion:
+ .db 8,6 ;8
+ .db %00000000 ;
+ .db %00000000 ;
+ .db %00000000 ;
+ .db %00000000 ;
+ .db %00000000 ;
+ .db %00000000 ;
+
+;--------------------------------- bullets ----------------------------------
+
+spr_bullet01:
+ .db 2,1
+ .db %11000000 ;▒██
+spr_bullet02:
+ .db 4,2
+ .db %11110000 ;▒████
+spr_bullet03:
+ .db 2,2
+ .db %11000000 ;▒██
+ .db %11000000 ;▒██
+spr_bullet04:
+ .db 3,2
+ .db %11100000 ;▒███
+ .db %11100000 ;▒███
+spr_bullet05:
+ .db 4,3
+ .db %01100000 ; ▒██
+ .db %11110000 ;▒████
+ .db %01100000 ; ▒██
+spr_bullet06:
+ .db 5,3
+ .db %00110000 ; ▒██
+ .db %11111000 ;▒█████
+ .db %00110000 ; ▒██
+spr_bullet07:
+ .db 5,3
+ .db %01110000 ; ▒███
+ .db %11111000 ;▒█████
+ .db %01110000 ; ▒███
+spr_bullet08:
+ .db 5,3
+ .db %11110000 ;▒████
+ .db %11111000 ;▒█████
+ .db %11110000 ;▒████
+spr_bullet09:
+ .db 5,4
+ .db %00010000 ; ▒█
+ .db %10111000 ;▒█▒███
+ .db %01111000 ; ▒████
+ .db %00010000 ; ▒█
+spr_bullet10:
+ .db 6,4
+ .db %00111000 ; ▒███
+ .db %01111100 ; ▒█████
+ .db %11111100 ;▒██████
+ .db %00110000 ; ▒██
+spr_bullet11:
+ .db 7,5
+ .db %00011000 ; ▒██
+ .db %11111100 ;▒██████
+ .db %00111110 ; ▒█████
+ .db %01111100 ; ▒█████
+ .db %00011000 ; ▒██
+spr_bullet12:
+ .db 7,6
+ .db %00110000 ; ▒██
+ .db %11111100 ;▒██████
+ .db %00111110 ; ▒█████
+ .db %01111110 ; ▒██████
+ .db %11111100 ;▒██████
+ .db %00111000 ; ▒███
+spr_bullet13:
+ .db 8,8
+ .db %00111100 ; ▒████
+ .db %11111110 ;▒███████
+ .db %01111111 ; ▒███████
+ .db %00011111 ; ▒█████
+ .db %01111111 ; ▒███████
+ .db %11111110 ;▒███████
+ .db %00111100 ; ▒████
+spr_bullett1:
+ .db 4,3 ;▒▒▒
+ .db %11100000 ;▒███
+ .db %11110000 ; ████
+ .db %01110000 ; ███
+
+spr_bullete1:
+ .db 4,3 ;enemy bullets
+ .db %01100000 ; ██▒
+ .db %11110000 ;████▒
+ .db %01100000 ; ██▒
+
+XLbullettable:
+ .db (spr_bullet01-spr_bullet01) ;0
+ .db (spr_bullet02-spr_bullet01) ;4
+ .db (spr_bullet03-spr_bullet01) ;8
+ .db (spr_bullet04-spr_bullet01) ;12
+ .db (spr_bullet05-spr_bullet01) ;16
+ .db (spr_bullet06-spr_bullet01) ;20
+ .db (spr_bullet07-spr_bullet01) ;24
+ .db (spr_bullet08-spr_bullet01) ;28
+ .db (spr_bullet09-spr_bullet01) ;32
+ .db (spr_bullet10-spr_bullet01) ;36
+ .db (spr_bullet11-spr_bullet01) ;40
+ .db (spr_bullet12-spr_bullet01) ;44
+ .db (spr_bullet13-spr_bullet01) ;48
+ .db (spr_bullet13-spr_bullet01) ;52
+ .db (spr_bullet13-spr_bullet01) ;56
+ .db (spr_bullet13-spr_bullet01) ;60
+
+;format:[min.damage] [dam.inc] [0000:direction 0000:speed] [offset]
+;damage = min.damage + dam.inc*incs (0<=incs<=6)
+maxnrweapons = 8+1
+weapondata:
+ .db 1,1,%11110000,0,%11110000,6,%00000000,0 ;LASER
+ .db 1,1,%00000010,2,%00000000,0,%00000000,0 ;single fire
+ .db 3,1,%00000011,2,%00000000,0,%00000000,0 ;fast single
+ .db 1,1,%00000010,0,%00000010,5,%00000000,0 ;double
+ .db 1,1,%00010010,2,%00110010,2,%01000010,2 ;triple
+ .db 3,2,%00010011,2,%00110011,2,%01000011,2
+ .db 5,3,%00010011,2,%00110011,2,%01000100,2
+ .db 7,4,%00010100,2,%00110100,2,%01000100,2
+ .db 12,5,%00010110,2,%00110110,2,%01000110,2
+
+collidedamage = 4
+
+;------------------------------------ bar -----------------------------------
spr_icon:
.db 16,7 ;selected .......:.......:
.db %10101010,%10101010 ; █ █ █ █ █ █ █ █
spr_icon01:
.db 16,7 ;armor ; .......:.......:
- .db %10001111,%10000000 ; █ █████
- .db %10010000,%01000000 ; █ █ █ ▒▒▒
- .db %10101110,%00100000 ; █ █ ███ █ ▒▒▒
- .db %10100111,%10100000 ; █ █ ████ █ ▒▒▒
- .db %10101110,%00100000 ; █ █ ███ █ ▒▒▒
- .db %10010000,%01000000 ; █ █ █ ▒▒▒
- .db %10001111,%10000000 ; █ █████
+ .db %10000111,%11110000 ; █ ███████
+ .db %10011000,%00001100 ; █ ██ ██
+ .db %10110011,%11000110 ; █ ██ ████ ██
+ .db %10110000,%11110110 ; █ ██ ████ ██
+ .db %10110011,%11000110 ; █ ██ ████ ██
+ .db %10011000,%00001100 ; █ ██ ██
+ .db %10000111,%11110000 ; █ ███████
spr_icon02:
.db 16,7 ;torpedo .......:.......:
.db %10111000,%00010101 ; █ ███ █ █ █
.db %10011000,%11110101 ; █ ██ ████ █ █
.db %11100110,%00110010 ; ███ ██ ██ █
spr_icon03:
- .db 16,7 ;empty .......:.......:
- .db %10000000,%00000000 ; █
- .db %10000000,%00000000 ; █
- .db %10000000,%00000000 ; █
- .db %10000000,%00000000 ; █
- .db %10000000,%00000000 ; █
- .db %10000000,%00000000 ; █
- .db %10000000,%00000000 ; █
+ .db 16,7 ;bullets .......:.......:
+ .db %10000000,%11000000 ; █ ██
+ .db %10000011,%11100000 ; █ █████ ▒▒▒
+ .db %10011000,%11000000 ; █ ██ ██ ▒▒▒
+ .db %11111100,%00000000 ; ██████ ▒▒▒
+ .db %10011000,%11000000 ; █ ██ ██ ▒▒▒
+ .db %10000011,%11100000 ; █ █████ ▒▒▒
+ .db %10000000,%11000000 ; █ ██
spr_icon04:
.db 16,7 ;laser .......:.......:
.db %10000000,%00000000 ; █
.db %10000000,%00000000 ; █
spr_icon05:
.db 16,7 ;multiple .......:.......:
- .db %10000011,%10000000 ; █ ███
- .db %10000001,%11100110 ; █ ████ ██
- .db %10000001,%11100000 ; █ ████
- .db %10000011,%10000000 ; █ ███
- .db %10011000,%00000000 ; █ ██
+ .db %10000011,%10000000 ; █ ███
+ .db %10000001,%11100110 ; █ ████ ██
+ .db %10000001,%11100000 ; █ ████
+ .db %10000011,%10000000 ; █ ███
+ .db %10011000,%00000000 ; █ ██
.db %10111100,%11000011 ; █ ████ ██ ██
- .db %10011000,%00000000 ; █ ██
-
-;---------------------------- texts -------------------------------------------
-
-txt_about: .db " v0.93.911",127,"by Shiar",0
-txt_email: .db "shiar0@hotmail.com",0
-txt_level: .db "LEVEL ",0
-txt_gameover: .db "GAME OVER!",0
+ .db %10011000,%00000000 ; █ ██
+spr_dividerline:
+ .db 8,7
+ .db 128,128,128,128,128,128,128 ;128 = %10000000
+
+;---------------------------- texts -----------------------------------------
+
+txt_email: .db "www.shiar.org ",127 ;title screen
+ .db " shiar0@hotmail.com",0
+_txt_email = $3A01 ;$3A1E=just email
+txt_about: .db " v0.97.625 ",127," by Shiar",0 ;right behind txt_email
+_txt_about = $331F
+txt_menu1: .db "NEW GAME",0
+txt_menu2: .db "CONTINUE",0
+
+txt_level: .db "LEVEL ",0 ;new level screen
+txt_lives: .db "Lx0",0
+txt_savekey: .db "Press [F1] to save",0
+
+txt_gameover: .db "GAME OVER!",0 ;game over screen
txt_score: .db "Score",0
txt_hiscore: .db "Hiscore",0
-txt_lives: .db "Lx0?",0
-txt_pressenter: .db "Enter to continue",0
-;---------------------------- save data ---------------------------------------
+txt_pressenter: .db "Enter to continue",0 ;pause
+txt_teacher: .db "(2",Lpi,"*.95)/sin 13",0 ;boss
+txt_teacherans: .db Lneg,"14.2063168184",0
-PutWhere .dw GRAPH_MEM ;where to put the wide sprites
+;---------------------------- save data -------------------------------------
-timer .db $00 ;frame counter
-level .db $00 ;level number
-levelp .dw level01 ;pointer to level data
-
-eventenemy .db $02 ;enemy type
-eventtime .db $15 ;enemy frequency
-eventleft .db $00 ;nr. of enemies still to come
-nextevent .db $50 ;time to next event
-pickuptimer .db $04
+PutWhere .dw GRAPH_MEM ;where to put the wide sprites
+laserlasts .db 5
-score .dw $0000
-stored_data_start:
+storehi_start:
hiscore .dw $0000
-stored_data_end:
+hiname .db "Shiar.97",0
+storehi_end:
-your_pickup .db $00
+storesave_start:
+level .db $01 ;level number
+levelp .dw level01 ;pointer to level data
+pickuptimer .db $04 ;counts when to place a pickup
+your_score .dw $0000
+
+your_pickup .db $04
your_occ .db $00 ;0=normal 1..16=exploding
-your_inv .db $50 ;invincibility left
-your_armor .db $13 ;HP left
-lives .db $04 ;
-x .db $16 ;x-pos
-y .db $46 ;think about it..
-hp .db $00 ;hitpoints left
-
-your_laser .db $01 ;laser avail: 0=no, 1=yes
+your_inv .db $00 ;invincibility left
+your_armor .db $0a ;HP left
+your_lives .db $03 ;
+
+your_weapon .db $02 ;weapon: 0=no, 1=laser, 2+=bullet n+1
your_multiples .db $00 ;multiples present
torp_occ .db $00 ;torp.state: 0=unavail 1=avail 2=presnt
torp_pos .dw $0000 ;torpedo position (x,y)
+storesave_end:
+
+
+;XLlevelsdata:---------------------------------------------------------------
+
+level00:
+ .db 0
+ .db $21,$1d,"Cosmic year 6716" ,0,0,$1d,$06
+ .db $1b,$1d,"storyline coming soon..." ,0,0,$1d,$06
+ .db $09,$19,"the Nemesis saga continues",0,1
+ .db $2e,$21,"with NEMESIS 86" ,0,1
+ .db $52,$36,"by Shiar" ,0,0,$19,$23
+ .db $ff
+
+;format:[nr.dif.enemies]x [enemy nr]
+; [enemy frequency] [next lvl]
+; [level_info: 0000:damage 0:directfire 0:ground 0:ceiling 0:diagfire]
+; [level_move] [level_fire] [tunnel size] [groundtype]
+; [16_ground] [16_ceiling] [stars1] [stars2]
+
+ .db $15,$07,$08 ;fireFreq; moveType; enemyType
+level01: ;efrequency must be odd if halfluring!
+ .db 3,$01,$02,$03
+ .db $1b,$2f,%00010001
+ .db 0,255
+ .db 0,0
+ .db 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 ;16
+ .db 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
+ .db 1,1
+
+ .db $10,$07,$09
+
+ .db 0
+ .db $01,01,"And the storyline conti",
+ .db "nues.....",0,1
+ .db $01,09,"You decide to fly close",
+ .db " to the",0,1
+ .db $01,15,"surface of a nearby pl",
+ .db "anet =)",0,0,1,20
+ .db $FF
+
+ .db $10,$07,$09
+level02:
+ .db 1,$02
+ .db $13,$4b,%00100101,0,064,0,0
+ .db 1,2,3,4,5,6,6,5,4,3,4,5,4,3,2,1
+ .db 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
+ .db 1,1
+
+ .db 0
+ .db $01,01,"Blablabla...",0,1
+ .db $01,34,"this storyline sux",0,0,1,39
+ .db $FF
+
+ .db $0E,$07,$09
+level03:
+ .db 1,$03
+ .db $2d,$3f,%00010110,0,255,-9,1
+ .db 3,2,4,3,2,2,1,1,1,1 ,1,1,21,17,18,20
+ .db 1,1,1,1,1,1,1,3,6,12,9,1,21,19,18,18
+ .db -1,-1 ;=%11111111=line
-;---------------------------- enemy data --------------------------------------
+ .db $0D,$07,$08
+level04:
+ .db 1,$04
+ .db $11,$41,%00100001,0,057,0,0
+ .db 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
+ .db 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
+ .db 1,1
+ .db $0C,$07,$09
+level05:
+ .db 1,$05
+ .db $11,$45,%00100101,%10,031,-7,1
+ .db 14,12,11,9,10,7,7,5,4,3,4,4,2,3,1,2
+ .db 1, 1, 1, 1,1, 1,1,1,1,1,1,1,1,1,1,1
+ .db 1,1
+ .db $0B,$07,$08
+level06:
+ .db 1,$06
+ .db $19,$3a,%00100111,0,255,-4,1
+ .db 20,22,18,15,9,1,1,1,1,1,1,1,1,1,1,1
+ .db 20,22,18,15,9,1,1,1,1,1,1,1,1,1,1,1
+ .db 1,1
+
+ .db $08,$07,$09
+level07:
+ .db 1,$07
+ .db $09,$ff,%00100001,0,043,0,0
+ .db 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
+ .db 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
+ .db 1,1
-sprites:
- .db $00
- .db spr_enemy01-spr_enemy00
- .db spr_enemy02-spr_enemy00
- .db spr_enemy03-spr_enemy00
- .db spr_enemy04-spr_enemy00
- .db spr_enemy05-spr_enemy00
- .db spr_enemy06-spr_enemy00
- .db spr_enemy07-spr_enemy00
+;------------------------------ enemies -------------------------------------
spr_enemy00:
- .db 7,5 ;pickup
- .db %11111110 ; ███████
- .db %11111110 ; ███████
- .db %11000110 ; ██ ██
- .db %11111110 ; ███████
- .db %11111110 ; ███████
+ .db 8,8 ;pickup
+ .db %00011000 ; ██
+ .db %00011000 ; ██
+ .db %00011000 ; ██
+ .db %11111111 ; ████████
+ .db %11111111 ; ████████
+ .db %00011000 ; ██
+ .db %00011000 ; ██
+ .db %00011000 ; ██
+
spr_enemy01:
- .db 6,6 ;enemy type one
- .db %00111100 ; ████
- .db %01110000 ; ███
- .db %11110000 ; ████
- .db %11110000 ; ████
- .db %01110000 ; ███
- .db %00111100 ; ████
+ .db 6,6 ;enemy type one
+ .db %00111100 ; ████
+ .db %01110000 ; ███
+ .db %11110000 ; ████
+ .db %11110000 ; ████
+ .db %01110000 ; ███
+ .db %00111100 ; ████
spr_enemy02:
- .db 8,6 ;enemy type two
- .db %00111111 ; █████
- .db %01111000 ; ████
- .db %11111100 ; ██████
- .db %11111100 ; ██████
- .db %01111000 ; ████
- .db %00111111 ; █████
+ .db 8,6 ;enemy type two
+ .db %00111111 ; █████
+ .db %01111000 ; ████
+ .db %11111100 ; ██████
+ .db %11111100 ; ██████
+ .db %01111000 ; ████
+ .db %00111111 ; █████
spr_enemy03:
- .db 6,6 ;enemy type three
- .db %01111100 ; █████
- .db %11110000 ; ████
- .db %11111000 ; █████
- .db %11111000 ; █████
- .db %11110000 ; ████
- .db %01111100 ; █████
+ .db 6,6 ;enemy type three
+ .db %01111100 ; █████
+ .db %11110000 ; ████
+ .db %11111000 ; █████
+ .db %11111000 ; █████
+ .db %11110000 ; ████
+ .db %01111100 ; █████
spr_enemy04:
- .db 6,6 ;enemy type four
- .db %00111000 ; ███
- .db %01111100 ; █████
- .db %11111000 ; █████
- .db %11111000 ; █████
- .db %01111100 ; █████
- .db %00111000 ; ███
+ .db 6,6 ;enemy type four
+ .db %00111000 ; ███
+ .db %01111100 ; █████
+ .db %11111000 ; █████
+ .db %11111000 ; █████
+ .db %01111100 ; █████
+ .db %00111000 ; ███
spr_enemy05:
- .db 7,6 ;enemy type four
- .db %00011110 ; ████
- .db %01111110 ; ██████
- .db %11111100 ; ██████
- .db %11111100 ; ██████
- .db %01111110 ; ██████
- .db %00011110 ; ████
+ .db 7,6 ;enemy type five
+ .db %00011110 ; ████
+ .db %01111110 ; ██████
+ .db %11111100 ; ██████
+ .db %11111100 ; ██████
+ .db %01111110 ; ██████
+ .db %00011110 ; ████
spr_enemy06:
- .db 7,6 ;enemy type four
- .db %00011100 ; ███
- .db %01111110 ; ██████
- .db %10111000 ; █ ███
- .db %10111000 ; █ ███
- .db %01111110 ; ██████
- .db %00011100 ; ███
+ .db 7,6 ;enemy type six
+ .db %00011100 ; ███
+ .db %01111110 ; ██████
+ .db %10111000 ; █ ███
+ .db %10111000 ; █ ███
+ .db %01111110 ; ██████
+ .db %00011100 ; ███
spr_enemy07:
- .db 8,6 ;enemy type four
- .db %00011110 ; ████
- .db %01111111 ; ███████
-enemy00:.db %10011100 ; █ ███
- .db %10011100 ; █ ███
- .db %01111111 ; ███████
- .db %00011110 ; ████
-
- ;enemyInfo: %000000:HP %10:occ $00:type $00:app $00:unused
-enemy01: ;#1 HP:1 app:random
- .db %00000010,1,1,0
-enemy02: ;#2 HP:1 app:halflure
- .db %00000010,2,3,0
-enemy03: ;#3 HP:1 app:random moving
- .db %00000011,3,1,0
-enemy04: ;#4 HP:2 app:lure
- .db %00000110,4,2,0
-enemy05: ;#5 HP:2 app:random moving
- .db %00000111,5,1,0
-enemy06: ;#6 HP:3 app:lure moving
- .db %00001011,6,2,0
-enemy07: ;#7 HP:6 app:halflure moving
- .db %00010111,7,3,0
-
-;----------------------------- level info -------------------------------------
-
-level01:
- .db $01,$1b,$2f ;enemy nr ; enemy frequency ; next lvl
-level02: ;frequency must be odd if halfluring!
- .db $02,$11,$4b
-level03:
- .db $03,$1f,$3f
-level04:
- .db $04,$0d,$4f
-level05:
- .db $05,$23,$3d
-level06:
- .db $06,$1f,$39
-level07:
- .db $07,$1d,$f9
-
-;----------------------------- logo -------------------------------------------
+ .db 8,6 ;enemy type seven
+ .db %00011110 ; ████
+ .db %01111111 ; ███████
+ .db %10011100 ; █ ███
+ .db %10011100 ; █ ███
+ .db %01111111 ; ███████
+ .db %00011110 ; ████
+spr_enemy08:
+ .db 8,6 ;enemy type seven
+ .db %00011110 ; ████
+ .db %01111111 ; ███████
+ .db %10011100 ; █ ███
+ .db %10011100 ; █ ███
+ .db %01111111 ; ███████
+ .db %00011110 ; ████
+
+spr_boss0_1:
+ .db 16,10 ;boss type one
+ .db %00000001,%11111111 ; █████████
+ .db %00001111,%11111110 ; ███████████
+ .db %00111111,%11110000 ; ██████████
+ .db %01011111,%10000000 ; █ ██████
+ .db %10011111,%01000000 ; █ █████ █
+ .db %10011111,%01000000 ; █ █████ █
+ .db %01011111,%10000000 ; █ ██████
+ .db %00111111,%11110000 ; ██████████
+ .db %00001111,%11111110 ; ███████████
+ .db %00000001,%11111111 ; █████████
+spr_boss0_2:
+ .db 16,10 ;boss type:one :
+ .db %11111110,%00000000 ; ███████
+ .db %00001111,%10001111 ; █████ ████
+ .db %00111111,%11100011 ; █████████ ██
+ .db %01001111,%11111110 ; █ ███████████
+ .db %10001101,%01111100 ; █ ██ █ █████
+ .db %10001101,%01111100 ; █ ██ █ █████
+ .db %01001111,%11111110 ; █ ███████████
+ .db %00111111,%11100011 ; █████████ ██
+ .db %00001111,%10001111 ; █████ ████
+ .db %11111110,%00000000 ; ███████
+
+;format: [000000:HP 00:occ] [HP64] [appearance(ypos)] [unused]
+XLenemyinfos:
+ .db %00100110,0,(spr_enemy01-spr_enemy00)/2,1 ;#1
+ .db %00101010,0,(spr_enemy02-spr_enemy00)/2,3 ;#2
+ .db %00001111,0,(spr_enemy03-spr_enemy00)/2,2 ;#3
+
+ .db %00000110,0,(spr_enemy04-spr_enemy00)/2,2 ;#4
+ .db %00000111,0,(spr_enemy05-spr_enemy00)/2,3 ;#5
+ .db %00001011,0,(spr_enemy06-spr_enemy00)/2,2 ;#6
+
+ .db %00011011,0,(spr_enemy07-spr_enemy00)/2,3 ;#7
+
+ .db %00110011,1,(spr_boss0_1-spr_enemy00)/2,1 ;boss1
+ .db %01001011,1,(spr_boss0_2-spr_enemy00)/2,3 ;boss2
+
+ .db %00000000,0,0,0
+ .db %00000000,0,0,0
+ .db %00000000,0,0,0
+ .db %00000000,0,0,0
+ .db %00000000,0,0,0
+ .db %00000000,0,0,0
+ .db %00000000,0,0,0
+
+;----------------------------------------------------------------------------
+;----------------------------- logo ------------------------------------------
+;----------------------------------------------------------------------------
logo_nemesis:
.db %11111111,%11111111,%11111111,%11111110,%11111111,%11110111,%11111111,%11111110,%11111111,%111101111,%11111111,%00001011,%11111111,%11111111,%11111111,%11111000
.db %00000000,%00000000,%00001111,%00011110,%11111111,%11110111,%10001111,%00011110,%11111111,%111101111,%11111111,%01111011,%11111111,%11000000,%00000001,%00010101
.db %00000000,%00000000,%00001111,%00011110,%11111111,%11110111,%10001111,%00011110,%11111111,%111101111,%11111111,%01111011,%11111111,%11000000,%00000001,%00010001
-;----------------------------- end --------------------------------------------
+;----------------------------- end ------------------------------------------
.end
.end
-;----------------------------- NEMESIS'86 by Shiar ----------------------------
-
-;Game · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · NEMESIS
-;Version · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 0.93.911
-;Latest modification · · · · · · · · · · · · · · · · · · · · · · · · 11.IX.99
-;Calc · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · TI-86 only
-;Size · · · · · · · · · · · · · · · · · · · · · · · · · · · 3098 bytes on calc
-;Author · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · SHIAR
-;ICQ · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · #43840958
-;E-mail · · · · · · · · · · · · · · · · · · · · · · · · · · shiar0@hotmail.com
-;Homepage · · · · · · · · · · · · · · · · · · · · · · · · · · · · come.to/shiar
+;----------------------------------------------------------------------------
+;----------------------------------------------------------------------------
+;----------------------------------------------------------------------------
-;Notes:
-; <*> This game is not yet finished (BETA) and there may still be some bugs.
-; <*> I'll probably release the source when the game has been finished.
-; <*> Have fun, and have even more fun with the completed version of NEMESIS!
-
-;----------------------------- version history --------------------------------
-
-;0.01.717 -- 17.VII.99 -- size 909
-;
-; + used "Galaxian"-game engine (drawings, movement, enemy-routines)
-; + movement of ship over 3/4 screen (96 pixels; 32 pixels for score)
-; + enemies moving from right to left, appearing right at specified times
-;
-; 0.1.718 -- 18.VII.99 -- size 832
-;
-; # no crash when level restarts for the third time
-; * exit-procedure updated, unnecessary stuff/keychecks removed
-; - alot of unused code removed
-; + different types of enemies (just look different)
-; + collision detection!! enemy ships disappear when you hit them
-;
-; 0.2.718 -- 18.VII.99 -- size 1078
-;
-; + ability to fire bullets (F1). Enemies disappear on impact
-; * enemies explode instead of disappearing
-;
-; 0.3.719 -- 19.VII.99 -- size 1326
-;
-; * bullets appear correctly (not INSIDE your ship)
-; + some enemies can take multiple hits (differs per class)
-; + all enemies fire bullets at random
-; + if you're hit by bullet/enemy, you'll lose one hitpoint
-;
-; 0.4.720 -- 20.VII.99 -- size 1406
-;
-; # collision detection fixed and optimized (much faster now!)
-; + shell-icon added (YAS type)
-; * code optimizations, some data "compression"
-; * explosion looks better, and some vars removed/smaller
-; # enemies are removed when at left side (instead of becoming invisible)
-; + displays level number before each level begins
-;
-; 0.5.725 -- 25.VII.99 -- size 1703
-;
-; * waits a sec at level display (in case of accidental keypress)
-; * moving enemies (move up+down)
-; # bullets removed correctly so they can be used again later
-; * first level made
-; # enemy weaponfire is fired from correct positions
-; + your ship explodes on impact with ships/bullets
-; * game over screen will be displayed just *after* your ship's gone
-; + frame counter onscreen
-;
-; 0.6.820 -- 20.IIX.99 -- size 2077 -- MAJOR UPGRADE first release (not on web)
-;
-; * play field increased to full screen instead of 3/4
-; + bottom eight lines used for score (etc) display
-; - no more solid levels, enemies are placed at random
-; + enemies appear every x turns (depends on level)
-; # fixed bullets so they don't disappear at 3/4 of the screen
-; * A LOT of optimizations both in speed and size!!
-; + enemy type, frequency, and number specified per level
-; + bottom score bar displays score, lives and icons (to be used later)
-; * smarter enemy handling (so enemies have different sizes)
-; + bottom bar divided from playing field by a horizontal line
-; + five levels (and five enemies) made
-; # game vars reset at start and game over
-; + NEMESIS LOGO displayed at startup!! (also, program grew 350bytes ):
-; + version/credits string displayed below logo: v0.6.820 by shiar (ICQ#)
-;
-;0.61.825 -- 25.IIX.99 -- size 2085 -- small changes to v0.6
-;
-; # pointer to fifth ship corrected (ships in level 5 weren't displayed)
-; # calc doesn't crash anymore when game is continued after game over!!
-; + lives are decreased when ship is destroyed
-; # last eight pixels of divider line are shown correctly now
-;
-; 0.7.92 -- 02.IX .99 -- size 2303 -- optimizations and pickups
-;
-; + contrast is increased one level at startup (and restored on exit)
-; + invulnerable for a sec when you enter the game (inv-pickup later)
-; + when in invulnerable-mode, your ship look different!
-; + at the beginning you get three *hitpoints* so you can be hit 3 times
-; * bottomline icons are now 16 pixels wide and 7 pixels high!
-; + hitpoint icon added: displays nr. of hps left next to a nice picture
-; * maximum invulnerability-time is increased (can last upto 1024 frames)
-; + when invulnerable-mode has nearly expired, your ship flashes!
-; * again a lot of optimizations esp. in size ('bout 100 bytes)
-; + pickups! 10% chance a destroyed enemy changes into an armor-pickup
-; # code optimization caused some bullets to reappear as "fake" bullets
-; * pickups can't be destroyed by bullets (they pass right through it)
-;
-; 0.8.93 -- 03.IX .99 -- size 2433 -- small improvements and bugfixes
-;
-; + enemies move individually, not all at the same time!! Looks very nice
-; # titlescreen background is cleared (looked weird in Rascall and TI-OS)
-; + enemies fire at a ### rate instead of firing at will (too random)
-; # moving enemies don't move off the screen top/bottom (they wait there)
-; + seven playable levels going easy to hard (including moving enemies)
-; # xtraInfo data wasn't reset when a moving enemy entered the game
-; * longer delay when level is completed (NextLevel screen came too soon)
-;
-; 0.9.94 -- 04.IX .99 -- size 2693 -- FIRST MAJOR (BETA) RELEASE; on websites
-;
-; # pickups no longer fire bullets like normal enemies
-; + <halt>s added so the game runs slower and looks better
-; + TORPEDOES!!! Bullets that fire downwards! Just like in Nemesis
-; * a pickup selects the next icon on bottom bar instead of increasing hp
-; + an icon can be taken by pressing F2. second icon selects torpedoes
-; + first icon increases armor, icon 3 and 4 are unused for now
-; * selecting an unused icon (3+4) resets pickups like icon 1 and 2
-; * when you're destroyed, you loose one life instead of going game over
-; you also loose all upgrades and pickups, but remain in the same level
-; * random is more randomized, no more "tricks" to fool the randomizer
-; # after game over the game is terminated instead of continuing+crashing
-; - no more armor to start with. you'll have to collect them on your own
-; * of course optimizations and a few tiny bug fixes (not important)
-; * increased the size of the enemy bullets so they're better to see
-;
-; 0.91.95 -- 05.IX .99 -- size 2797 -- good improvements (upgrades); beta rel.
-;
-; + LASERS!!!!! four pickups and you fire laserbeams instead of bullets
-; * multiple enemies can be hit at once, very usefull when firing lasers
-; + MULTIPLE!! like the (shadow-)multiple from MSX-Nemesis. for 5 pickups
-; you get an multiple following you, firing bullets and lasers like you
-; * most data (enemy positions) stored at TEXT_MEM and DELC_LEN positions
-; instead of in program, saving A LOT of bytes in program-size
-; - at release of 0.91 bullets didn't work, laser is used instead
-;
-; 0.92.98 -- 08.IX .99 -- size 2831 -- beta released to testers
+; 0.97.625 -- 25.VI.00 -- size 5753
;
-; + all bullets and enemies are removed at the start of a level
-; # you can fire bullets again (no more laser at startup)
-; * pickups aren't given at random, but appear every x enemies destroyed
-; # solved a minor bug in invulnerability flashing display
-; * clearScreen procedure improved (faster and smaller)
-; # fifth icon couldn't be selected (so no multiples selectable). fixed
-; * laserbeam lasts 5 turns (laser wasnt good enough compared to bullets)
+; # bullets do damage in all levels
+; * more armor at armor-upgrade and extra armor at end of a level
+; - internal levels again (no need 4 external, safer/smaller)
+; # some registers not correctly pushed/popped
+; * several optimizations (init.procs some bytes smaller)
+; # enemies hit with hitpoints left disappeared (one pop too much...)
+; + bullets "charge up" (more damage) when not firing
+; + more powerful bullets have different sprites (larger=more damage)
+; # multiples appear at your position (begin level/just selected)
+; # when invulnerable multiples acted weird
+; # no more error at activation after APD off after running Nemesis
+; # saves correctly if own name ain't "nemesis" + some bytes smaller
+; # screen wasn't always entirely cleared after quit
+; * waits until all keys have been released after death
+; + different bullets sizes will miss if they're too small
+; + at level start "press F1 to save"-text will be displayed
+; * w3.shiar.org displayed at title screen, black bar behind version nr
+; # score to 0 when exit pressed at main menu
+; # no residual story-text in first frame of game
+; # game doesn't continue again after death (stack messed up)
+; # game over when lives<0 (didn't work in v0.96+)
+; * using some self-modifiing code (so it's smaller)
+; # new random procedure: stars don't appear on one line anymore
+; * weapons appear centered at multiples
+; * laser properties can be changed (damage, charge)
+; + weapon can be combination of bullets/lasers (max. of 3 per weapon)
+; * bullet-icon is removed when laser is selected
+; * enemy sprite table integrated in enemy specs (-1 byte/enemy)
;
-;0.93.911 -- 11.IX .99 -- size 3098
;
-; # torpedo-upgrade was cleared when firing torpedo at the end of a level
-; * pickups move away half the speed of enemies (one pixel every 2 turns)
-; # fixed a bug causing some calcs to crash on quit
-; # contrast was not restored after game over (remained one step darker)
-; * fire key changed from F1 to 2ND, select key changed from F2 to ALPHA
-; * improved key-checking procedureS (much faster, smaller, better, yea)
-; * changed title screen, displays version white on black and my e-mail
-; + score count!! simple system: one point for an enemy destroyed, two
-; for collision, and one point every 256 frames. plus level clear bonus
-; + saves HISCORE!!! At game-over screen your- and hi-score are displayed
-; * Game over screen will be displayed before quit after pressing <exit>
-; + screen is cleared and cursor moved to top-left on quit
-; * multiples move only when YOU move, just like the original MSX-Nemesis
-; * multiple is placed at your position when selected/at start of level
-; * minor changes in iconbar (3rd icon is empty, line between 5th/score)
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-
-; + added - removed * changed # bug fixed
+; + added - removed * changed # bug fixed
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git.shiar.nl / nemesis.git / blobdiff