- .include "asm86.h"
- .include "ti86asm.inc"
- .include "ti86abs.inc"
+;----------------------------------------------------------------------------
+;---------------------- NEMESIS ---------------------------------------------
+;----------------------------------------------------------------------------
+
+;by SHIAR | shiar0@hotmail.com | icq#43840958 | www.shiar.org
+
+;Description : cool arcade-shoot-em-up-game
+;Other games by author : Worm
+;This source should only be used for learning practises, do not
+;alter it, and certainly do not distribute an altered version!!
+
+;&&& 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
- nop
- jp Start
- .dw $0000
- .dw Title
-Title: .db "Nemesis v0.01 by Shiar",0
-Start: call _runindicoff
-TEXT_MEM = $c0f9
-temp1 = $c120
-StringPlace = $c180
-jpf1 = $c200
+#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
+
+dispbuffer = $81FA ;= $C9FA ;virtual screen
+;VIDEO_MEM = $FC00 ;tha big scareen
+TEXT_MEM = _textShadow ;text buffer; C0F9-C1A0 (167/$A7 bytes)
+
+_clrWindow = $4a86 ;_clrLCD and _clrScrn
+_ex_ahl_bde = $45f3 ;exchange values between AHL and BDE
+_shracc = $4383 ;like _shlacc but just the opposite :P
+_dispahl = $4a33 ;display value in ahl <100000 (cheap TI)
+_asapvar = $d6fc ;our own variable name (likely "nemesis")
+
+storepos = _asm_exec_ram+7000 ;120 OF 165
+storepos2 = _asm_exec_ram+7200 ;141 OF 167 9000 BYTES
+
+;---------------------- 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 ;=
+ ; ;--------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 = 9 ;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:diagfire 0:ground 0:ceiling 0:-]
+;enemies:
+; [HP64] [000000:HP left 00:(00=no enemy 01=exploding 10=normal 11=moving)]
+; [ship type or explosion frame] [x] [y] [movetype] [movecounter] [firecounter] [firefreq]
+
+;---------------------- 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 v0.98 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: ;new interrupt proc
+ ex af,af' ;just af only (no need for exx)
+ in a,($03) ;read bit 3 port 3
+ bit 3,a ;is ON key pressed?
+ jp z,$0039 ;no: np, return
+ res 0,a ;yes: then we have a problem (freeze), so...
+ out ($03),a ;...mask the ON key interrupts!
+ jp $0039 ;all done, return
+int_end:
+
+init: cal BUSY_OFF ;turns the run-indicator off, obviously
+ cal _clrScrn ;clean the screen
+ xor a ;ld a,0
+ res 2,(iy+13) ;don't scroll the screen
+ cal _flushallmenus ;remove TI menus
+
+FixKeys: ;fixes some key problems like left+down bug
+ im 1
+ ld a,$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 ;new interrupt 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 -------------------------------------------
+
+LogoPut:
+ 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)
+ dnz underline ;repeat
+
+ 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!!
+ 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
-;-------------------- init ----------------------------------------------------
+menuloop:
+ ld a,(menuitem)
+ ld h,$01
+ add a,4
+ ld l,a
-init:
- set 0,(iy+3)
- ld (iy+13),0
+ ld a,5
+ ld (_curRow),hl
+ cal _putc
-;-------------------- main menu -----------------------------------------------
+ ld a,(menuitem)
+ ld h,$01
+ sub 5
+ neg
+ ld l,a
- jp play_game
+ 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
+ cp K_F1
+ cal z,do_invert
+ cp K_SECOND
+ jr z,start_tha_freakin_game
+ cp K_ENTER
+ jr nz,menuloop
+start_tha_freakin_game:
+
+ ld a,(menuitem)
+ dec a
+ cal nz,New_game ;NEW GAME
+ jp samelevel ;CONTINUE: 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: ;invert screen (b<>w); destr:b
+ psh hl
+ ld b,a ;psh a
+ ld hl,_invert
+ ld a,$98
+ xor (hl) ;$2F (cpl) <-> $B7 (or a)
+ ld (hl),a
+ ld a,b ;pop a
+ pop hl
+ ret
-;-------------------- exit ----------------------------------------------------
+;----------------------------------------------------------------------------
+;---------------------- game loop -------------------------------------------
+;----------------------------------------------------------------------------
-exit_game:
+game_main_loop: ;REPEATS FROM HERE EVERY FRAME
+ ld hl,timer ;update time
+ inc (hl) ;increase by 1
+ ld a,(hl)
+ and %11111
+ ld hl,1 ;once every 32 frames, increase score by 1
+ cal z,scoreInc ;do it
+
+Clear_screen:
+ ld hl,dispbuffer ;move from (hl) = top left
+ ld (hl),$00 ;first pixel will be copied all over the screen
+ ld de,dispbuffer+1 ;(de) = next pixel, thus clearing whole screen
+ ld bc,896 ;loop 896 times = (128/8) * (64-8 for scorebar)
+ ldir ;all clear!
+
+ ld a,0 ;current frame/turn 0-255
+timer =$-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,%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) ;gettem!
+
+check_exitkey:
+ bit 6,a ;test bit 6 = exit-key = EXIT
+ 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
+ cal z,Pause ;yes, go to pause
+
+check_firekey:
+ bit 5,a ;test bit 5 = 2nd-key = FIRE
+ 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 (bulletstaillasermultiples+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
+ nop \ nop ;what's taking you so long
+ in a,(1) ;at last... our precious keyzzz...
+
+ 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 Level_event ;insert enemies
+ cal Display_Screen ;display all
+
+ ld b,1
+___:
+ halt ;delay
+ dnz ___
+ 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
-;----------------------- game setup -------------------------------------------
+;--------------------------- 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
+ jr newground+1
+
+ground_tunnel:
+ ld a,(groundpos+14)
+ ld d,a
+ ld hl,spacespace
+ ld bc,$500 ;range=0..4
+ cal Random ;a=0..4
+ dec a ;a=-1..3
+ dec a ;a=-2..2
+ ld b,a
+ add a,(hl) ;add to spacesize (so +2..-2)
+ cp 10
+ jr c,newground ;>=0 then don't change
+ ld c,a
+ ld a,d
+ add a,b ;new position
+ or a
+ jr z,newground ;may not be 0 (=256)
+ cp -10
+ jr nc,newground ;and not be <0 (>246)
+diffground:
+ ld d,a
+ ld (hl),c
+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,dispbuffer+(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
+
+;--------------------------- ceiling ----------------------------------------
+
+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,dispbuffer-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
-play_game:
- ld hl,stored_data_start
- ld bc,variables_end-stored_data_start-1
+ ld a,l
+ and %00001111
+ cp 9 ;(GRAPH_MEM&%00001111)-- = $C9FAand15-1 = $A-1
+ jr nz,newstarok
+ cal RandomY
-;---------------------- display setup ----------------------------------------
+newstarok:
+ ld (ix),l
+ ld (ix+1),h
+ inc ix \ inc ix
+ dnz movestars_loop
+ ret ;for stupid people, here's another comment...
-set_up_display:
- call _clrLCD
+;--------------------------- pause ------------------------------------------
- ld hl,in_game_text
- ld b,3
-l11: ld a,(hl)
- ld (_curCol),a
- inc hl
- ld a,(hl)
- ld (_curRow),a
- inc hl
- call _puts
- djnz l11
+Pause:
+ psh af
+ ld hl,$0200 ;top left
+ ld (_curRow),hl
+ ld hl,txt_pressenter ;"Enter to continue"
+ cal _puts ;display message
+pause:
+ cal _getkey ;enter low-power mode and wait for key
+ cp kEnter ;keypressed = enter?
+ jr nz,pause ;no, wait some more
+ pop af
+ ret ;continue
+
+;--------------------------- teacher ----------------------------------------
+
+Teacher:
+ ld (iy+12),5 ;enable flashing cursor
+ cal _clrWindow ;top left
+ ld hl,txt_teacher
+ cal _puts ;display message
+ cal releasekeys
+
+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
+ cal releasekeys
+ jp disp_icons ;+ret
+
+teacherans:
+ ld a,' '
+ cal _putc
+
+ ld hl,$0701
+ ld (_curRow),hl
+ ld hl,txt_teacherans
+ cal _puts
+ jr teacherloop
-;------------------------ in-game texts ---------------------------------------
-in_game_text:
- .db 16,0,"LIVES",0
- .db 16,3,"LEVEL",0
- .db 16,6,"SCORE",0
+;--------------------------- exit -------------------------------------------
-str_question:
- .db "-----",0
+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,dispbuffer ;graph-screen location
+ ld de,dispbuffer+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
-;-------------------------- game loop -----------------------------------------
+;--------------------------- display ----------------------------------------
-game_main_loop:
- ld hl,timer
- inc (hl)
+Display_Screen:
+ ld hl,dispbuffer ;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 b,16 ;display width = 16 bytes (16*8bits=256pixels)
+displaytloop:
+ ld a,(hl) ;copy byte from (hl)
+_invert: ;SMC: cpl <-> or a
+ 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 56x
+
+ ld hl,time2invert
+ ld a,(hl)
+ or a ;(time2invert)=0:
+ jr z,noinvert ; do nothing
+ dec a ;otherwise decrease
+ cal z,do_invert ;if it became 0 then invert
+ ld (hl),a ;save new value
+noinvert:
+
+ ld hl,$396b ;Display Score
+ ld (_penCol),hl ;bottom right of screen
+ 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
+
+ ld hl,savestr ;we (the program) saved the value righthere
+ jp _vputs ;the only thing left to do is to display it
+
+savestr: ;@here the score will be stored
+ .db "00000",0 ;don't worry, it's just temporary
+
+;------------------------- handle ship --------------------------------------
- xor a
- ld hl,GRAPH_MEM+(16*12)
- ld b,a
-csl: ld (hl),a
- inc hl
+Handle_Ship:
+ ld a,(your_occ) ;are
+ or a ;you
+ jr z,ok ;ok?
+
+ inc a ;no! next (explosion)frame
+ ld (your_occ),a ;save
+
+ cp 64+1 ;last explosion frame? (1-16=1st;49-64=4th)
+ jp c,exploding_you ;not yet: display explosion
+ cp 64+16 ;delay finished?
+ jp z,You_die ;yes = game over
+ ret ;don't display anything
+
+;----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) ;come back in
+
+ 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,(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 later
+
+ jr c,no_down
+ ld a,(hl)
+ add a,c
+ cp 50 ;56-6 = bottom of screen
+ jr nc,no_down
ld (hl),a
- inc hl
+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 c ;<dec a> doesn't affect c-flag
+ jr c,no_left ;-1 = left side
ld (hl),a
+no_left:
+ rr b
+ jr c,no_right
+ ld a,(hl)
+ add a,c
+ cp 122 ;128-6 = right side
+ jr nc,no_right
+ ld (hl),a
+no_right:
+ ld d,(hl) ;d=x
+ inc hl
+ rr b
+ jr c,no_up
+ ld a,(hl)
+ 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) ;e=y
+ ld ix,spr_ship01 ;normal ship sprite
+your_shipspr =$-2
+ ld hl,your_inv ;invulnerable?
+ ld a,(hl) ;load time in a
+ or a ;is it 0?
+ jr z,disp_ship ;yes so ship = normal (display \ continue)
+
+ ld a,(timer) ;load frame nr.
+ 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 %00000100 ;a switches 0<->1 every 2 frames
+ jr z,disp_ship ;show normal ship
+inv_flicker:
+ ld bc,spr_ship01i-spr_ship01
+ add ix,bc ;display invulnerable ship
+disp_ship:
+ cal safeputsprite ;display your ship; save de
+
+;----multiples----
+
+handle_multiples:
+ 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 a,b ;restore a (your_multiples)
+ 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 (next position)
+ and %00001111 ;if a>15 then a=a-16
+ ld (hl),a ;save new a
+ add a,a ;a=a*2
+ ld c,a ;bc=2a
+ ld b,0
+
+ ld hl,your_prevpos ;previous positions
+ add hl,bc ;16 turns ago
+ ld b,(hl) ;old x-pos
+ inc hl ;and
+ 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 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
+ srl a ;half that framerate
+ srl a ;and half again that framerate
+ ld hl,x-1
+ ld ix,spr_yexplosion ;base sprite
+
+explosion_stuff: ;in:a=frame*2+(0 to 1); (hl)=xpos-- ix=sprite
+ and %11111110
+ add a,a
+ add a,a ;frame*8
+ ld c,a
+ ld b,0 ;bc=a
+ add ix,bc ;go to correct sprite (each spr. is 8 bytes)
+ inc hl
+ ld d,(hl) ;load xpos
inc hl
- djnz csl
+ ld e,(hl) ;and y
+ jp putsprite ;and display it too
- call Level_event
- call Handle_Ship
- call Handle_enemies
- call Display_Screen
- call Misc_Keys
- jr game_main_loop
+;----hit----
-;---------------------- display -----------------------------------------------
+damage_you: ;damages you B points
+ ld a,(your_inv) ;shield left?
+ or a
+ jr z,dothadamage ;no shield
+ srl b ;shield: half the damage
+dothadamage:
+ ld hl,time2invert
+ xor a ;a=0
+ cp (hl) ;no already inverted?
+ cal z,do_invert ;then invert screen
+ ld a,2
+ ld (hl),a ;change back 2 frames from now
+
+ ld hl,your_armor ;armor left
+ 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
+ jp disp_armor ;and display new value
+no_armor:
+ ld a,%01 ;occ %xxxxxx01 = explode
+ ld (your_occ),a ;too bad, you're dead meat
+ ret
-Display_Screen:
- ld a,64 ;Display Image
- ld hl,GRAPH_MEM+(16*12)
- ld de,$fc00
-dsl: ld bc,12
- ldir
- inc de
- inc de
- inc de
- inc de
+;------------------------- 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
+place_multiples:
+ ld (hl),d ;set prev-x to d
+ inc hl ;next
+ ld (hl),e ;set prev-y to e
+ inc hl ;next
+ dnz place_multiples ;repeat
+ ret
+
+;------------------------- select upgrade -----------------------------------
+
+inc_armor:
+ ld a,(your_armor) ;load current armor
+ cp 25-6 ;may not become >=25
+ jr c,doincarmor ;ok then just add 6
+ ld a,24-6 ;set to maximum (6 will be added below)
+doincarmor:
+ add a,6 ;add 6 to armor
+ ld (your_armor),a ;change armor
+ ret
+
+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
+select1:
+ ld (hl),a ;reset pickups
+ cal inc_armor
+ jp disp_icons ;display and return
+select2:
+ dec a ;is it 2?
+ jr nz,select3 ;no, carry on
+ ld (hl),a ;reset pickups
+ inc a ;a=1
+ ld (your_tail),a ;ready tail beam
+ jp disp_icons ;display 'n return
+select3:
+ 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 maxweapon
+ 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
+ ld hl,your_weapon
+ ld a,(hl)
+ cp maxweapon ;upgrade from bullet
+ jr nc,upgradelaser ;nope, just upgrade
+ ld a,maxweapon-1 ;yes, set laser #1
+upgradelaser:
+ inc a ;next laser
+ cp maxlaser
+ jp nc,disp_icons ;laser maxed out
+ ld (hl),a
+ cal loadweapon
+ jp disp_icons ;display + return
+select5:
+ dec a ;is it 5?
+ jr nz,select6 ;no, carry on once more
+ ld (hl),a ;reset pickups
+ inc a
+ ld (your_multiples),a
+ ld de,(x)
+ cal Place_multiples
+ jp disp_icons ;display, return
+select6:
+ ld (hl),0 ;reset pickups
+ jp disp_icons ;display/return
+
+;------------------------- fire bullet --------------------------------------
+
+Fire_bullet:
+ 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_weapon) ;if you have bullets.....
+ cp maxweapon
+ jr nc,fireOK ;>weapons = laser
+ 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 a,(your_multiples) ;any multiples?
+ and %11 ;nope?
+ jr z,fireany ;then just fire somethin'
+ 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: ;HL=(x,y)
+ ld (firex),hl ;set position to fire from
+ ld a,(your_weapon)
+ ld ix,weapondata+2-(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), b=3 :P
+ add ix,bc
+
+fire_weapon: ;b=3
+ psh bc ;save counter
+ ld a,(ix) ;load this weapon
+ cp %11100000 ;%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
+
+fire_tail:
+ ld hl,your_tail
+ ld a,(hl)
dec a
- jr nz,dsl
+ ret nz
+ ld a,(ix-2) ;last weapon fired
+ cp %11100000 ;issit laser
+ ret z ;then return
+ xor %11111 ;smart way of going left instead of right :P
+ jr fire_ybullet ;fire tail bullet and return
+
+;-----fire LASER-----
+
+fire_laser:
+ ld b,0 ;overflow counter
+ ld hl,firex
+ ld d,(hl) ;d = your x-pos
+ inc hl
- ld hl,$1007 ;Display Score
- ld (_curRow),hl
- ld hl,(score)
-; jp _D_HL_DECI
+ 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
+ rl b ;b (=0) =b*2+overflow (if y>32 then bc=bc+256)
+ add a,a ;y*16 (width of screen)
+ rl b ;b=b*2+overflow (if y>64 then bc=bc+512)
+ inc a ;8 pixels to right (a=even so no overflow)
+
+ srl d ;X/2
+ 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
+ ld hl,dispbuffer ;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
+drawlaser:
+ ld (hl),%11111111
+ inc hl ;Go to next byte
+ dnz drawlaser
+handle_laser:
+ pop de ;de=(firex): x-pos unmodified
+
+check_laserhits: ;de = (x,y)
+ psh ix
+ 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
+
+ cal find_sprite ;ix=sprite to enemy (hl)
+ 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
+ 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
+ dec a ;minus one
+ add a,(ix+1) ;add enemy height (according to sprite @ix)
+ jp m,nolashit ;a-e>0 = hit
+enemy_lashit:
+ ld a,(curweapdamage) ;damage
+ cal enemy_hit ;hl=enemy+y
+nolashit:
+ 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
+ pop ix
ret
-;------------------------- handle ship ----------------------------------------
+;-----fire BULLETs-----
-Handle_Ship:
- ld a,(your_status)
- bit 4,a
- jr nz,you_not_normal
- or a
- jr z,ok
- dec a
- ld (your_status),a
- ld hl,(lives)
- ld a,l
- or h
- jr nz,ok
- pop af
- ret
-ok:
- ld a,%01111110
- out (1),a
- ld hl,y
- in a,(1)
- rra
- ld b,a
-
- jr c,no_down
- ld a,(hl)
- inc a
- cp 73 ;y < 73
- jr z,no_down
- ld (hl),a
-no_down: dec hl
- rr b
- jr c,no_left
- ld a,(hl)
- dec a
- jr z,no_left ;x > 0
- ld (hl),a
-no_left: rr b
- jr c,no_right
- ld a,(hl)
- inc a
- cp 89 ;x < 89
- jr z,no_right
- ld (hl),a
-no_right:ld d,(hl)
- inc hl
- rr b
- jr c,no_up
- ld a,(hl)
- dec a
- cp 15 ;y > 15
- jr z,no_up
- ld (hl),a
-no_up:
- ld ix,spr_ship
-
-display_common:
- ld e,(hl)
- jp drw_spr
-
-you_not_normal:
-
- ld hl,(score)
- ld de,-6
- add hl,de
- ld a,255
- cp h
- jr nz,_ok_
- ld hl,0
-_ok_: ld (score),hl
- ld a,(your_status)
- dec a
- ld (your_status),a
- inc a
- and 14
- xor 14
- ld hl,x-1
-
-explosion_stuff:
- rra
- add a,a
- add a,a
- add a,a
- ld c,a
- ld b,0
- ld ix,spr_explosion
- add ix,bc
- inc hl
- ld d,(hl)
- inc hl
- jr display_common
-
-;---------------------------- handle keys -------------------------------------
-
-Misc_Keys:
- ld a,$BF
- out (1),a
- nop
- nop
- in a,(1)
- rla
- rla
- jr nc,e_exit
-
- ld a,$FD
- out (1),a
- nop
- nop
- in a,(1)
- rra
- bit 5,a
- ret nz
-e_exit: pop af
+fire_ybullet: ;fire bullet type=C dam=(curweapdamage) at (firex/y)
+ ld c,a ;save bulletType in c
+ ld hl,ybullets ;check for unused bullet
+ ld de,4
+ ld b,nrybuls
+find_ybullet:
+ ld a,(hl)
+ or a
+ jr z,found_ybullet ;0 = no bullet here
+ add hl,de
+ dnz find_ybullet ;look next bullet
+ ret ;none found, return don't fire
+
+found_ybullet:
+ ld (hl),c ;use the bullet and set correct bullet-type
+ inc hl ;@damage
+ ld (hl),1 ;set bullet damage
+curweapdamage =$-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 a,(firey) ;your y-pos
+ add a,(ix+1) ;place bullet at the middle of your ship
+ inc hl ;go to bullet-y
+ ld (hl),a ;set y
+
+ xor a
+ ld (weapincs),a ;reset damage
ret
-;--------------------------- level events -------------------------------------
+;------------------------ handle bullets ------------------------------------
+
+bullet_left:
+ ld c,a ;c=type
+ and %11111 ;pixels to move
+ add a,(hl) ;a = X + (hl) to the right
+ sub 16 ;and 16 to the left (so -16..+15)
+ jr c,remove_bullet ;remove if x<0
+ cp 128
+ jr nc,remove_bullet ;or x>=128
+ ld (hl),a ;save new pos.
+ ld d,a ;d = X
+
+ inc hl ;@y-pos
+ ld a,c
+ cal _shracc ;%11110000->1111
+ srl a ;%1110->111
+ dec a
+ jr z,bullet_noymove ;1=straight forward
+ dec a
+ jr z,bullet_up ;2=up
+ dec a
+ jr z,bullet_halfup ;3=1/2up
+ dec a
+ jr z,bullet_down ;4=down
-Level_event:
- ld a,(nextevent)
+bullet_halfdown: ;5=1/2down
+ 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
- ld (nextevent),a
+ jr z,bullet_noymove
+ ld (hl),a
+bullet_noymove:
+ ld e,(hl) ;e = Y
+ ret
+
+remove_bullet:
+ pop hl ;cal bullet_left
+ pop hl ;enemy+type
+ ld (hl),0 ;dump this bullet!
+ jr next_ybullet+1 ;+1:skip pop hl at next_ybullet
+
+Handle_bullets:
+ ld hl,ybullets
+ ld b,nrybuls
+scan_bullets:
+ 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
+
or a
- ret nz
+ jp z,next_ybullet ;bulletType=0 >> no bullet
+ cal bullet_left ;move bullet left
+
+display_bullet:
+ psh de ;save de =position
+ dec hl ;@x
+ dec hl ;@damage
+ ld a,(hl) ;bullet damage=size
+ ld hl,bullettable ;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
+
+ cal safeputsprite ;display bullet; DE 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
-do_event:
- ld hl,(curevent)
+;--------------------------- check bullethits -------------------------------
+
+check_bullethits: ;INPUT: de=X,Y; (temp1)=bullet
+ ld b,nrenemies
+ ld hl,enemies+1
+
+hit_enemies: ;Hits with normal enemies
+ psh bc ;enemy counter
+ psh hl
+
+ ld a,(hl)
+ and %00000010
+ jr z,nohit ;no hit when enemy_occ <> 2/3
+
+ inc hl ;enemy type
+ ld a,(hl)
+ or a ;enemy #0 = pickup
+ jr z,nohit ;yes: don't destroy
+
+ cal find_sprite ;set ix to the sprite of this enemy
+
+ inc hl ;@x
+ ld a,(hl) ;check x
+ sub d ;minus bullet x-position
+ ld b,a ;psh a
+ sub 5 ;minus bullet x-size
+bulletxsize =$-1
+ jp p,nohit ;miss
+ ld a,b ;pop a
+ add a,(ix) ;add enemy width
+ jp m,nohit ;miss
+
+ inc hl ;@y
+ ld a,(hl) ;check y
+ sub e ;minus bullet y-position
+ ld b,a ;psh a
+ sub 3 ;substract bullet height
+bulletysize =$-1
+ jp p,nohit ;nope, missed it
+ ld a,b ;pop a
+ add a,(ix+1) ;add enemy height
+ dec a ;minus one
+ 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: ;*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),%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
inc hl
+ ld (hl),$00 ;explosionFrame 0
- ld de,enemies
- dec de
- dec de
-search_noenemy:
- inc de
- inc de
- ld a,(de)
- cp $ff
- jr nz,search_noenemy
+ ld hl,1 ;increase score by one
+ jp scoreInc ;+ret
- ld a,$5a
- ld (de),a
- inc de
+;--------------------------- level events -----------------------------------
+
+Level_event:
+ ld hl,nextevent ;time to next event <ld a,(nextevent)
+ dec (hl) ;decrease counter <dec a
+ ld a,(hl) ;look at counter <ld (nextevent),a
+ or a ;has it reached zero?
+ ret nz ;nope: get outta here!
+
+ ld bc,0 ;enemy frequency (lvl)
+eventtime =$-2
+ cal Random
+ ld (nextevent),a ;set time to next event
+ ld hl,eventleft
+ dec (hl) ;update enemy-counter
+
+ ld a,(hl) ;look at counter
+ or a ;has it reached 0?
+ jp z,Next_level ;yes: level finished
+ dec a ;has it reached 1?
+ 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),123 ;set delay
+ ret ;don't place any more enemies
+
+standby_event:
+ ld b,nrenemies
+ ld hl,enemies+1-enemysize
+ ld de,enemysize
+chk_enemyleft:
+ add hl,de
ld a,(hl)
- ld (de),a
+ or a ;0 = no enemy present
+ jr nz,enemyleft
+ dnz chk_enemyleft
+ ret
+enemyleft:
+ ld hl,eventleft
+ inc (hl)
+ ret
+
+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)
+
+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: ;de = enemy+1
+ ld bc,0 ;0..nrlvlenemies
+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
+ cal findenemyspecs ;hl = enemy #a specs
+
+ dec de ;goto hp64 (before occ)
+ ldi ;set hp64
+ ldi ;set hitpoints+occ of enemy class
+ ld a,(hl) ;save sprite-offset/2 (ldi decs bc so in a)
+ ldi ;set sprite
+ ldi ;set x-position
+
+ ld c,a ;c=sprite
+ ld a,(hl) ;load placeInfo
inc hl
- ld (curevent),hl
+ dec a ;is it 1?
+ jr z,random_enemy ;yes: create random value <51 in a
+ dec a ;is it 2?
+ jr z,lure_enemy ;yes: create a 100% luring enemy
+ ;otherwise?
+halflure_enemy: ;yes (of course it is): pick one (50% lure)
+ ld a,(timer) ;look at frame-number
+ and %00000001 ;make random if odd frame nr.
+ jr nz,random_enemy ;1st possibility: random enemy
+lure_enemy: ;2nd possibility: luring enemy
+ ld a,(y) ;place at same y-pos as YOUR ship
+ jr ypos_OK
+random_enemy:
+ ld b,0 ;bc = enemy sprite offset / 2
+ ld ix,spr_enemy00 ;first enemy sprite
+ add ix,bc ;add offset for current enemy
+ add ix,bc ;twice (offset stored as offset/2)
+ ld a,64-8 ;=57=screen height (8 is scorebar)
+ sub (ix+1) ;minus sprite height=bottom
+ ld c,b ;range=0 to...
+ ld b,a ;...57-y
+ cal Random ;random value on screen
+ypos_OK: ;random value successfully created
+ ld (de),a ;save y-position
+ inc de ;@movecounter
+ ldi ;set move-type
+ ld a,1 ;movecounter = 1
+ ld (de),a ;set
+ inc de ;@firecounter
+ ldi ;set time-to-1st-fire
+ ldi ;set firefreq
+ ret ;return
+
+;--------------------------- enemy fires ------------------------------------
+
+Enemy_fires: ;de = x,y
+ dec d
+ dec d ;d = x-2
+ inc e ;e = y+1
+
+ ld b,nrebuls
+ ld hl,ebullets
+find_ebullet:
ld a,(hl)
- ld (nextevent),a
+ or a
+ jr z,found_ebullet ;0 = not used
+ inc hl \ inc hl \ inc hl
+ dnz find_ebullet ;look next bullet
+ ret
+
+found_ebullet:
+ 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
+ ret
+
+;----------------------------- enemy bullets --------------------------------
+
+Enemy_bullets:
+ ld hl,ebullets
+ ld b,nrebuls
+handle_bullet:
+ psh bc
+ psh hl
+ ld a,(hl) ;load bulletType in a
+ 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
+ dnz handle_bullet
ret
-;--------------------------- handle enemies -----------------------------------
+enemy_bullet:
+ ld b,a ;save type&%1111
+ inc hl ;bullet x
+ ld a,(hl) ;check if it has reached the left side of scrn
+ bit 7,a ;x<0?
+ jr nz,remove_ebullet ;yes, remove bullet
+ dec (hl) ;move one left
+ dec (hl) ;and another one
+ ld d,(hl) ;d=x
+ inc hl ;@y
+
+ ld a,b ;restore type
+ 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
+
+ ld a,(timer)
+ rra
+ jr c,ebullet_common
+
+ 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
+ cal putsprite
+
+ebullet_hits:
+ ld a,(your_occ)
+ or a
+ jr nz,next_bullet ;0 = you're normal
+
+ pop hl
+ psh hl
+ inc hl ;check x
+ ld a,(x)
+ sub (hl)
+ add a,6
+ jp m,next_bullet
+ cp 9
+ jr nc,next_bullet
+
+ inc hl ;check y
+ ld a,(y)
+ sub (hl)
+ add a,6
+ jp m,next_bullet
+ cp 9
+ jr nc,next_bullet
+
+ 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:
- ld hl,enemies
+ ld hl,enemies+1
+ ld b,nrenemies ;handle all enemies
handle_enemy:
- push hl
- ld d,(hl)
+ psh bc
+ psh hl
+
+ ld a,(hl)
+ and %00000011
+ jr z,next_enemy ;occ "no enemy" 0
+ dec a
+ jr z,exploding_enemy ;occ "exploding" 1
+
+normal_enemy:
inc hl
- ld e,(hl)
+ ld c,(hl) ;c = enemy type = de
+ cal find_sprite
- ld a,d
+ inc hl
+ ld d,(hl) ;x
+ inc hl
+ ld e,(hl) ;y
+
+ inc hl ;@movetype
+ cal moving_enemy
+ dec hl
+
+ ld a,e ;new y value
+ cp 57
+ jr c,enemyonscreenY ;=on screen
+ cp -20 ;moved off at top
+ ld e,0 ;reset to top
+ jr nc,enemyonscreenY
+ ld e,57 ;otherwise reset to bottom
+enemyonscreenY:
+ ld (hl),e ;store new y
+ dec hl ;@x
+
+ ld a,d ;new x value
+ cp 128 ;x<128
+ jr c,enemyonscreenX ;=on screen
+ cp -7 ;x<=-8
+ jr c,remove_enemy ;=off screen
+enemyonscreenX:
+ ld (hl),d ;store new x
+ ld a,c ;a = enemy type
+ or a ;type 0? (pickup)
+ jr nz,check_enemyfire ;no, a normal enemy; let em fire
+ ld a,(timer) ;load time
+ and %1 ;move left once every 2 turns
+ jr z,firing_done ;don't move now
+ inc d ;increase x-position (don't move this turn)
+ inc (hl) ;and save it
+ jr firing_done ;continue
+
+check_enemyfire:
+ inc hl ;@y
+ inc hl ;@movetype
+ inc hl ;@movecount
+ inc hl ;@firecount
+ dec (hl) ;decrease counter till next blast
+ ld a,(hl) ;&&&doesn't seem efficient to me
+ or a ;has it reached zero?
+ jr nz,firing_done ;finished if not
+
+ inc hl ;@firefreq
+ ld a,(hl)
+ dec hl
+ ld (hl),a ;reset counter for next blast
+ psh de ;save registers for firing-use
+ cal Enemy_fires ;fires bullet
+ pop de ;restore (destroyed by Enemy_fires)
+firing_done:
+ cal putwidesprite ;display sprite @ix
+
+next_enemy:
+ pop hl
+ ld bc,enemysize
+ add hl,bc
+ pop bc
+ dnz handle_enemy
+ ret
+
+remove_enemy:
+ pop hl
+ ld (hl),$0000 ;bye bye enemy
+ jr next_enemy+1 ;continue AFTER pop hl (already done)
+
+exploding_enemy:
+ inc hl
+ ld a,(hl)
+ cp 16
+ jr z,remove_enemy ;remove when at last frame
+ inc a
+ ld (hl),a ;next frame
+ dec a ;1-16 -> 0-15
+ ld ix,spr_explosion ;base sprite
+ cal explosion_stuff ;display explosion
+ jr next_enemy
+
+;--------------------------- moving enemies ---------------------------------
+
+moving_enemy:
+ ld a,(hl) ;how does this enemy move?
+ bit 7,a ;direction indicator
+ jr nz,moveright
+moveleft:
+ dec d
+ jr moveXdone
+moveright:
+ inc d
+moveXdone:
+ res 7,a ;01111111=movetype:
+ and a
+ ret z ;0 = don't move
+ dec a
+ jr z,movetype_updown ;1 = 0 >< up / down
+ dec a
+ jr z,movetype_vslow ;2 = .75 >>
+ dec a
+ jr z,movetype_slow ;3 = .5 >>
+ dec a
+ jr z,movetype_fast ;4 = .5 <<
+ dec a
+ jr z,movetype_vfast ;5 = 1 <<
+ dec a
+ jr z,movetype_smart ;6
+ dec a
+ jr z,movetype_lure ;7 = 1 >> move y towards you
+ dec a
+ jr z,movetype_slowlure ;8 = 1 >> lure 1/2 speed
+ dec a
+; jr z,movetype_stoplure ;9 = 1 >> slowlure; stop at x=99
+; dec a
+; jr z,movetype_fulllure ;10 = x+y towards you 1/2 speed
+
+movetype_fulllure:
+ ld a,(timer)
+ and 1
+ ret z
+ cal movetype_lure
+ ld a,(x)
+ cp d
+ ret c ;move left (already did)
+lure_right:
+ inc d ;already moved left, so move right
+moverightonce:
+ inc d ;twice (=+1)
+ ret
+
+movetype_slowlure:
+ ld a,(timer)
+ and 1 ;half the time
+ jr z,moverightonce ;dont move at all (compensate move left +ret)
+movetype_lure:
+ ld a,104
+ cp d
+ jr c,dothelurethingy
+ inc d ;x<106: full stop
+dothelurethingy:
+ ld a,(y)
+ cp e
+ ret z ;don't move if equal
+ jr c,lure_up ;below you then move up
+lure_down: ;above then move 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_slow:
+ ld a,(timer)
+ and %1
+ ret z
+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
+ add a,128
+move_updated:
+ ld (hl),a
+
+ or a ;reset carry flag
+ dec hl ;@ <y>
+ and %00100000
+ ld a,(hl);&&&ld a,e ;load current y-position
+ jr z,movedown
+
+moveup: dec a ;decrease y-pos (=move up)
+ ret m ;don't move off the screen (y<0)
+ dec e ;save new y-pos
+ ret ;finish
+movedown:
+ inc a ;increase y-pos
+ cp 55 ;compare with bottom
+ ret nc ;return if it has passed that line (>40)
+ inc e ;otherwise save new position
+ ret ;and return
+
+;--------------------------- check collision --------------------------------
+
+Enemies_hit:
+ 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:
+ psh hl
+ ld a,(hl)
+ and %00000010
+ jr z,check_next ;2 or 3 = ok
+ inc hl
+
+collide_enemy: ;&&& include in Handle_enemy proc
+ cal find_sprite
+
+ inc hl
+ ld a,(hl) ;check x match
+ sub e ;enemy position minus yours minus 7
+ jp p,check_next
+ add a,6
+ add a,(ix) ;enemy width
+ jp m,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
+ dec hl
+ dec hl
+
+take_pickup:
+ 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 z,next_enemy
+ jr nz,collide ;enemy when <>0
+
+ psh hl
+ ld hl,your_pickup ;your pickups
+ ld a,(hl) ;current
+ inc a ;go to next
+ cp 6 ;pickups >=6
+ jr c,not_maxpickup
+ ld a,1 ;yes: reset to pickup 1
+not_maxpickup:
+ ld (hl),a ;save new
+ cal disp_icons ;display altered pickupicons
+ pop hl
+
+ dec hl ;to enemy occ
+ xor a ;set to 0 = gone
+ 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:
+ dec hl
+ 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
- ld d,a
- jr z,remove_enemy
+ jr z,storyLine
+
+ psh hl
+ ld hl,VIDEO_MEM ;copy text
+ ld de,dispbuffer ;to GRAPH_MEM
+ ld bc,1024 ;entire screen
+ ldir
+ cal _clrLCD
+ pop hl
- ld (hl),e
+ inc hl
+ ld a,(hl)
+ inc hl
+ ld b,(hl)
+ psh hl
+ cal DoSFX
+ cal _getkey
+ pop hl
+ ret
+
+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 = $ff
+ jr nz,dostory ;otherwise loop
+
+ ld bc,2+1 ;story ends
+ add hl,bc ;set hl to beginning of the level
+ ld (levelp),hl ;set the level-pointer
+ ret ;and return
+
+;--------------------------- SFX --------------------------------------------
+
+DoSFX: ;in:a=beginLine;b=nrOfLines
+ ld (curline),a
+SFXframe:
+ psh bc
+
+ ld a,0 ;get line number
+curline =$-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,dispbuffer
+ 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 --------------------------------------
+
+drawline:
+ ld (hl),a ;draw one piece of the divider-line
+ inc hl ;move right (8 pixels = 1 byte)
+ 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 b,16*7 ;draw 16x (screen width) 7x (height)
+ xor a ;blank line mask
+ cal drawline ;clear scorebar
+
+disp_lives:
+ ld de,5 ;(0,5)
+ ld a,(your_lives) ;nr of lives
+ or a
+ jr z,displivesdone ;no lives
+ ld b,a
+displivesloop:
+ psh bc
+ ld ix,spr_lship
+ cal safeputsprite ;put li'l ship
+ ld a,lshipsize+1
+ add a,d
+ ld d,a ;x=x+5
+ pop bc
+ dnz displivesloop ;one ship per life
+displivesdone:
+
+ ld ix,spr_icon01 ;armorIcon
+ ld de,$1901 ;icon #1
+ cal putwidesprite ;display icon
+ cal disp_armor ;display bar
+
+ ld ix,spr_icon00
+ ld a,(your_weapon) ;ur weapon
+ cp maxweapon ;laser?
+ psh af ;(your_weapon)
+ jr nc,no_tail ;if laser (nc) then tail ain't fired
+ ld a,(your_tail)
+ or a
+ jr z,no_tail
+ ld ix,spr_icon02 ;tailbeamIcon
+no_tail:
+ ld de,$2901 ;icon #2
+ cal putwidesprite ;display
+
+ ld ix,spr_icon00
+ pop af ;a=(your_weapon); cf=bullets
+ psh af
+ jr nc,no_bullets ;=laser
+ ld hl,$3945 ;position to display bullet-type digit
+ pop af ;digit=(your_weapon)
+ psh af
+ inc a ;1 = weapon #1 (=0)
+ 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
+ cal putwidesprite ;display icon
+
+ ld ix,spr_icon00 ;emptyIcon
+ pop af ;ld a,(your_weapon)
+ ld b,a
+ jr c,no_laser ;popped carry
+ ld hl,$3955 ;position to display bullet-type digit
+ ld (_penCol),hl ;set location
+ ld a,b ;(your_weapon) ;load = faster than push
+ sub maxweapon-1 ;1 = laser #1 (=maxweapon)
+ add a,'0' ;make digit
+ cal _vputmap ;display char
+ ld ix,spr_icon04 ;laserIcon
+no_laser:
+ ld de,$4901 ;icon #4
+ cal putwidesprite
+
+ ld ix,spr_icon00 ;emptyIcon
+ ld a,(your_multiples)
+ and %11
+ jr z,no_multiples
+ ld ix,spr_icon05
+no_multiples:
+ ld de,$5901 ;icon #5
+ cal putwidesprite
+
+ ld ix,spr_dividerline
+ ld de,$6901
+ cal putwidesprite
+
+ ld a,(your_pickup) ;pickups taken
+ 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
+ add a,$09 ;add 0ah
+ ld d,a ;y-pos = picks * $10 + $0a (19,29,39,49,59)
+ ld e,$01 ;x-pos = bottom (1a01,2a01,3a01,4a01,5a01)
+
+ ld ix,spr_icon
+ cal putwidesprite
+iconsdone:
+ ld hl,dispbuffer ;normal game-screen
+ ld (PutWhere),hl ;set sprite-position to normal screen
+
+ pop ix \ pop hl \ pop de \ pop bc
+ ret
+
+disp_armor:
+ ld de,16 ;line size
+ ld hl,(57*16)+VIDEO_MEM+3
+ ld b,3
+armorbarclr:
dec hl
- ld (hl),d
- ld ix,spr_enemy01
- call drw_spr
- jr next_enemy
+ ld (hl),0
+ add hl,de
+ ld (hl),0
+ sbc hl,de
+ dnz armorbarclr
+
+ ld a,(your_armor) ;load your armor (<25)
+ 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
+ add hl,de ;one down (resets carry)
+ ld (hl),%11111111 ;same piece
+ sbc hl,de ;up again
+ 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
+ add hl,de
+ ld (hl),a ;and just below
+ ret
-remove_enemy:
+disp_charge:
+ ld hl,(59*16)+VIDEO_MEM+3
+ ld b,3
+chargebarclr:
dec hl
- ld (hl),$0000
+ 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 chargebar ;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
-next_enemy:
+;--------------------------- proc -------------------------------------------
+
+Random: ;a=c<random<b+c; destr:none
+ psh hl
+ ld hl,rancount ;amount to increase with (0-255)
+randomloop:
+ inc (hl) ;change for next time
+ ld a,r ;value $0-7F (can be _anything_ so watch out!)
+ add a,0 ;add to last random value
+ranseed =$-1 ;SMC :P
+ add a,(hl) ;add the changing increase value
+ ;(this is because R can be anything;
+ ; ie always be even so freeze when a must be 1<=a<=1)
+ ld (ranseed),a ;save for next time
+ cp b ;a>=b
+ jr nc,randomloop ;then add again
+ add a,c ;a<b; a=a+c
+ pop hl
+ ret
+rancount: .db 0
+
+RandomY: ;HL = random Y 0..50 right side ((1..51)*16-1)
+ psh bc
+ ld bc,50*256+1 ;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,dispbuffer
+ add hl,de ;position on screen
+ pop bc
+ ret
+
+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
+
+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
+
+findenemyspecs: ;enemy #a specs in (hl); in:b=0; out:ac=?
+ ld hl,enemyspecs-8 ;enemy "0" specs (1 before enemy #1)
+ add a,a ;a=type*2
+ add a,a ;a=type*4
+ add a,a ;a=type*8
+ ld c,a ;b=0; c=bc=type*8
+ add hl,bc ;hl = enemy specs
+ 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
+
+ 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
+
+ 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
+ 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)
+
+ ld hl,$314b ;bottom-1 right before score ^^
+ ld (_penCol),hl ;set
+ ld hl,txt_score ;"Score"
+ cal _vputs ;display (small)
+
+ ld hl,$1007 ;bottom right
+ ld (_curRow),hl ;set
+ ld hl,(hiscore) ;hi-score
+ cal _dispahl ;display
+ ld hl,$3946 ;bottom right before hiscore ^^
+ ld (_penCol),hl ;set
+ ld hl,txt_hiscore ;"Hiscore"
+ cal _vputs ;display (small)
+ res 3,(iy+5)
+
+ ld b,16
+ ld de,16
+ ld hl,VIDEO_MEM+(49*16)-1
+restore_line:
+ set 1,(hl)
+ add hl,de
+ dnz restore_line
+
+ cal _getkey ;wait for keypress
+ jp quit ;restore some things and return to TI-OS/shell
+
+invship: ;procedure used in New_game
+ psh af
+ inc b
+ ld de,$C0
+ ld hl,VIDEO_MEM+$30-$C0;begin pos
+invshipinit:
+ add hl,de
+ dnz invshipinit
+ ld b,$B0 ;12 lines down
+invshiploop:
+ ld a,(hl)
+ cpl ;invert byte
+ ld (hl),a
+ inc hl
+ dnz invshiploop ;loop
+ pop af
+ ret
+
+New_game: ;stack must be +1 (so change the jp in cal :)
+ cal _clrLCD
+ ld hl,VIDEO_MEM
+ ld (PutWhere),hl ;will be reset after displaying iconbar
+ ld ix,spr_ship01 ;first ship: sprite
+ ld de,$0105 ;position
+ ld b,4 ;number of ships to display
+dispshipsloop:
+ psh bc ;counter
+ psh de ;position
+ cal putwidesprite ;display
+ pop de
+ ld bc,spr_ship01i-spr_ship01+2
+ add ix,bc ;go to next ship
+ ld a,12 ;below the previous one
+ add a,e
+ ld e,a
+ pop bc
+ dnz dispshipsloop ;loop
+
+ ld b,0 ;menu pos.
+selectship:
+ psh bc
+ cal invship
+selectshiploop:
+ halt
+ cal GET_KEY
+ or a
+ jr z,selectshiploop
+ pop bc
+ psh bc
+ cal invship
+ pop bc
+ cp K_SECOND
+ jr z,startthenewgame
+ cp K_ENTER
+ jr z,startthenewgame
+ cp K_DOWN
+ jr nz,selnotdown
+ inc b
+selnotdown:
+ cp K_UP
+ jr nz,selnotup
+ dec b
+selnotup:
+ ld a,b
+ and %11
+ ld b,a
+ jr selectship
+
+startthenewgame:
+ ld hl,spr_ship01-(spr_ship02-spr_ship01)
+ ld de,spr_ship02-spr_ship01
+ inc b ;your ship #0-3++
+searchyourship:
+ add hl,de ;next ship
+ dnz searchyourship
+ ld (your_ship),hl
+ xor a ;ld a,0
+ ld (your_score),a ;reset score
+ ld (your_score+1),a ;reset score (0)
+ ld (your_tail),a ;no tail beam
+ ld (your_weapon),a ;no laser
+ ld (your_pickup),a ;reset pickups
+ ld (your_multiples),a ;no multiples
+ 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
+ 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
+
+ cal inc_armor ;increase armor
+ ld hl,level ;level number
+ ld a,(hl)
+ inc a
+ ld (hl),a
+
+ add a,a
+ add a,a
+ ld h,0 ;increase score....
+ ld l,a ;by level number * 4
+ ld bc,20
+ add hl,bc ;plus 20
+ cal scoreInc ;update score
+
+ ld hl,(levelp) ;level pointer
+ ld b,0 ;advance one level
+ ld c,(hl)
+ add hl,bc ;passed the enemies
+ ld c,1+7+32+3
+ add hl,bc ;update to point to next level
+ ld (levelp),hl ;save
+
+samelevel:
+ ld hl,(your_ship)
+ ld (your_shipspr),hl
+
+ ld a,80
+ ld (nextevent),a ;time to first enemy appearance
+
+ ld hl,(levelp) ;level pointer
+ 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
inc hl
ld a,(hl)
- cp $ff
- jr nz,handle_enemy
-
- ret
-
-;--------------------------- putsprite ----------------------------------------
-
-offsets_table:
- .db 128,64,32,16,8,4,2,1
-drw_spr: ld a,d
- and 7
- ld hl,offsets_table
- ld c,a
- ld b,0
- add hl,bc
- ld a,(hl)
- ld (_smc1+1),a
-
- ld (_smc1+1),a
- ld hl,GRAPH_MEM
- ld a,e
- add a,a
- add a,e
- 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)
-_oloop: 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
-_smc1 ld a,1 ;Load pixel mask
-_iloop: sla c ;Test leftmost pixel
- jr nc,_noplot ;See if a plot is needed
- ld e,a ;OR pixel with screen
- or (hl)
- ld (hl),a
- ld a,e
-_noplot: rrca
- jr nc,_notedge ;Test if edge of byte reached
- inc hl ;Go to next byte
-_notedge:djnz _iloop
- pop hl ;Restore address
- ld bc,12 ;Go to next line
- add hl,bc
- pop bc ;Restore data
- djnz _oloop
- ret
-
-;drw_sprw:
- 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,GRAPH_MEM
-
- ld a,e
- add a,a
- add a,e
- 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
-wnoplot: rrca
- 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,12 ;Go to next line
- add hl,bc
- pop bc ;Restore data
- djnz woloop
- ret
-wover_1: ld c,(ix+2)
- inc ix
- djnz wiloop
- dec ix
- pop hl
- ld bc,12
- add hl,bc
- pop bc
- djnz woloop
- ret
-
-
-HL_Decimal:
- ld (_penCol),de ;set display position
- ld de,StringPlace+4 ;end of location to store string
- ld b,5 ;digits
-ConvLoop:
- call UNPACK_HL ;value to string
- add a,'0'
- ld (de),a ;store char
- dec de
- djnz ConvLoop ;loop
- ld hl,StringPlace ;display stored chars
- call _vputs
- ret
-
-
-
-
-;------------------------------- sprites --------------------------------------
-
-spr_ship:
- .db 7,7
- .db %11111000
- .db %11000000
- .db %11111100
- .db %11111110
- .db %11111100
- .db %11000000
- .db %11111000
+ ld (eventtime+1),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 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),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)
+
+ cal loadweapon ;load (your_weapon)
+
+ 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)
+
+;--------------------------- setup game -------------------------------------
+
+game_setup:
+ cal BLACKLCD ;white on black
+ ld hl,txt_level
+ ld de,$0703
+ ld (_curRow),de ;center
+ cal _puts ;display "LEVEL "
+
+ ld a,(level) ;current level
+ ld l,a
+ 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
+ cal _putmap ;display first digit
+
+ ld hl,txt_lives ;bar text: "Lx0"...
+ 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
+
+ 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
+
+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
+ add hl,bc
+ ld a,(hl)
+ ld (weapdamage),a ;damage of bullets
+ inc hl
+ ld a,(hl)
+ ld (weapdaminc),a ;damage increase
+ ret
+
+;----------------------------------------------------------------------------
+;--------------------------- putsprite --------------------------------------
+;----------------------------------------------------------------------------
+;in: de=(x,y); ix=sprite
+;out: ix=behind sprite; hl:a=right below sprite; b=0; d=width; ce=?
+
+putsprite:
+ ld c,(ix) ;save width
+_putsprite: ;putsprite with custom width
+ ld a,d ;a=X
+ bit 7,d ;check sign bit of X
+ jr z,CSpositive ;X>=0
+
+ neg ;a=|X|
+ cp (ix) ;off screen?
+ ret nc ;X<=-width: don't draw at all
+ ld b,a ;b=|X|mod 8=1..7=bits to draw
+ ld a,%11111111 ;all bits set (draw everything)
+CSclipleft:
+ srl a ;remove first bit in a for each b
+ dnz CSclipleft ;b=1: a=%01111111
+ ;b=2: a=%00111111
+ ;b=3: a=%00011111
+ ;b=4: a=%00001111
+ ;b=5: a=%00000111
+ ;b=6: a=%00000011
+ ;b=7: a=%00000001
+ res 7,d ;X+128 (right side of screen)
+ dec e ;Y--
+ jr CSdisplay ;done clipping
+
+CSpositive:
+ sub 129-8 ;minus (screen width - byte width)
+ ld b,a
+ ld a,%11111111 ;clipmask
+ jr c,CSdisplay ;x+width<128 then entire sprite is on screen
+ inc b ;b = number of pixels off screen
+CSclipright:
+ add a,a ;remove last bit in a for each b
+ dnz CSclipright ;b=1: a=%11111110
+ ;b=2: a=%11111100
+ ;b=3: a=%11111000
+ ;b=4: a=%11110000
+ ;b=5: a=%11100000
+ ;b=6: a=%11000000
+ ;b=7: a=%10000000
+ ;b>7: a=%00000000 = off screen
+
+CSdisplay: ;display the sprite ix at (d,e) masked
+ ld (CSclipmask),a ;set mask
+ cal findpixel ;convert de to screen location hl:a
+ ld (CSbitmask),a
+
+ ld d,c ;width
+ ld b,(ix+1) ;height
+CSyloop:
+ psh bc ;save rows to go
+ psh hl ;screen
+ ld b,d ;width
+ ld a,(ix+2) ;load image line
+ and 255 ;mask
+CSclipmask =$-1
+ ld c,a ;c=image
+ inc ix ;next
+CSbitmask =$+1
+ ld a,1 ;saved bitmask
+CSxloop:
+ sla c ;test leftmost pixel
+ jr nc,CSnodraw ;don't draw if it's 0
+ ld e,a ;psh af: save bitmask
+ or (hl)
+ ld (hl),a ;OR pixel with screen
+ ld a,e ;pop af
+CSnodraw:
+ rrca ;next bit
+ jr nc,CSbitdrawn ;carry set if bit "jumped"
+ inc hl ;next byte
+CSbitdrawn:
+ dnz CSxloop
+ pop hl ;screen at x-offset=0
+ ld bc,16
+ add hl,bc ;next line
+ pop bc ;rows counter
+ dnz CSyloop
+CSdone: ret
+
+;--------------------------- putbigsprite -----------------------------------
+
+putwidesprite:
+;destr: abcdehl+ix (ix=behind sprite; hl:a=right below sprite; b=0; d=width)
+ ld a,(ix) ;width
+ cp 9
+ jr c,putsprite ;width<=8: just draw the sprite
+
+ ld a,(ix)
+ sub 8 ;width>8
+ psh af
+ ld c,8
+ psh de
+ cal _putsprite ;otherwise draw one column (8 pixels wide)
+ pop de
+ inc ix ;no x-size to load
+ ld a,8 ;next
+ add a,d ;8 pixels right
+ ld d,a
+ pop bc ;then draw the remaining pixels (c=width-8)
+ ld c,b
+ jr _putsprite
+
+safeputsprite: ;cal putsprite with de intact
+ psh de
+ cal putsprite
+ pop de
+ ret
+
+;------------------------------- findpixel ----------------------------------
+;based upon CLEM's fp | 131 cycles | 28 bytes | in:(d,e); out:hla; destr:de
+
+findpixel:
+ ld a,e ;a=e=Y
+ add a,a
+ add a,a ;add a,a is 7 cycles faster than add hl,hl
+ ld h,0 ;switch to hl now (Y<64)
+ ld l,a ;hl=4*Y
+ ld a,d ;a=d=X
+ rra ;RRA: carry flag must be reset!
+ add hl,hl ;that's what the adds are for :P
+ rra
+ add hl,hl ;hl=16*Y
+ rra ;a=X/8
+ or l
+ ld l,a ;hl=hl+a
+ ld a,d
+ and 7 ;a=X\8
+ cpl
+ rlca
+ rlca
+ rlca
+ ld (FPbit),a
+ xor a
+FPbit =$+1
+ set 0,a
+ ld de,dispbuffer ;screen base position (where x+y=0)
+PutWhere =$-2
+ add hl,de
+ ret
+
+;----------------------------------------------------------------------------
+;------------------------------- sprites ------------------------------------
+;----------------------------------------------------------------------------
+
+spr_ship01:
+ .db 7,7 ;ship alpha class
+ .db %11000000 ;██
+ .db %11110000 ;████
+ .db %01111110 ; ██████
+ .db %11101000 ;███ █
+ .db %01111110 ; ██████
+ .db %11110000 ;████
+ .db %11000000 ;██
+spr_ship01i:
+ .db 8,7
+ .db %11000010 ;██ █
+ .db %11110001 ;████ █
+ .db %01111111 ; ███████
+ .db %11101001 ;███ █ █
+ .db %01111111 ; ███████
+ .db %11110001 ;████ █
+ .db %11000010 ;██ █
+
+spr_ship02:
+ .db 7,7 ;ship beta class
+ .db %11100000 ;███
+ .db %11111000 ;█████
+ .db %01111100 ; █████
+ .db %01110010 ; ███ █
+ .db %01111100 ; █████
+ .db %11111000 ;█████
+ .db %11100000 ;███
+spr_ship02i:
+ .db 8,7
+ .db %11100010 ;███ █
+ .db %11111001 ;█████ █
+ .db %01111101 ; █████ █
+ .db %01110011 ; ███ ██
+ .db %01111101 ; █████ █
+ .db %11111001 ;█████ █
+ .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 %11111100 ; ██████
+ .db %01100010 ; ██ █
+ .db %11111100 ; ██████
+ .db %11110000 ; ████
+ .db %11000000 ; ██
+spr_ship04i:
+ .db 8,7
+ .db %11000010 ; ██ █
+ .db %11110001 ; ████ █
+ .db %11111101 ; ██████ █
+ .db %01100011 ; ██ ██
+ .db %11111101 ; ██████ █
+ .db %11110001 ; ████ █
+ .db %11000010 ; ██ █
+
+spr_multiple:
+ .db 6,5 ;multiples
+ .db %01111000 ; ████
+ .db %11001100 ; ██ ██
+ .db %10000100 ; █ █
+ .db %11001100 ; ██ ██
+ .db %01111000 ; ████
+
+;-------------------------------- explosions --------------------------------
+
+spr_explosion:
+ .db 8,6 ;1
+ .db %00000000
+ .db %00011100 ; ███
+ .db %00111110 ; █████
+ .db %01010110 ; █ █ ██
+ .db %00111000 ; ███
+ .db %00000000
+
+ .db 8,6 ;2
+ .db %00110000 ; ██
+ .db %01001110 ; █ ▒███
+ .db %10111110 ; █ █████
+ .db %01001111 ; █ ▒████
+ .db %00111000 ; ███
+ .db %00011010 ; ██ █
+
+ .db 8,6 ;3
+ .db %10110000 ; █ ██
+ .db %01001110 ; █ ███
+ .db %10110101 ; █ ██▒█▒█
+ .db %01000101 ; █ ▒█▒█
+ .db %00111110 ; █████
+ .db %01011010 ; █ ██ █
+
+ .db 8,6 ;4
+ .db %00101010 ; ▒ █▒█ █
+ .db %01000110 ; █ ▒██
+ .db %10110101 ; █ ██ █ █
+ .db %01100110 ; ██ ██▒
+ .db %00111100 ; ████▒
+ .db %01011001 ; █ ██ ▒█
+
+ .db 8,6 ;5
+ .db %01000000 ; █▒ ▒ ▒
+ .db %00100101 ; ▒█ █▒█
+ .db %00010100 ; ▒ ▒█ █ ▒
+ .db %01000100 ; █▒ █
+ .db %00010010 ; ▒█▒▒█
+ .db %10011010 ; █▒ ██ █▒
+
+ .db 8,6 ;6
+ .db %01000100 ; █ █
+ .db %00100000 ; ▒█ ▒ ▒
+ .db %00000001 ; ▒ ▒ █
+ .db %01000100 ; █ █
+ .db %00100010 ; █▒ █
+ .db %01001000 ; ▒█ ▒█ ▒
+
+ .db 8,6 ;7
+ .db %00001000 ; ▒ █▒
+ .db %11000010 ; ██ ▒ █
+ .db %00000000 ; ▒
+ .db %00100000 ; ▒█ ▒
+ .db %00000001 ; ▒ ▒█
+ .db %00110000 ; ▒██▒
+
+ .db 8,6 ;8
+ .db %00000100 ; ▒█
+ .db %00000000 ; ▒▒ ▒
+ .db %01000000 ; █
+ .db %00000000 ; ▒
+ .db %00000010 ; █▒
+ .db %00100100 ; █▒ █
+
+spr_yexplosion:
+ .db 8,5 ;1
+ .db %00000000
+ .db %00101100 ; █ ██
+ .db %00011110 ; ████
+ .db %00110100 ; ██ █
+ .db %00011000 ; ██
+ .db %00000000
+
+ .db 8,5 ;2
+ .db %00111000 ; ███
+ .db %01011100 ; █ ███
+ .db %10010111 ;█ █ ███
+ .db %01000110 ; █ ██
+ .db %00111000 ; ███
+ .db %00000000
+
+ .db 8,6 ;3
+ .db %00111100 ; ████
+ .db %01001111 ; █ ████
+ .db %10100011 ;█ █ ██
+ .db %11000110 ;██ ██
+ .db %01110101 ; ███ █ █
+ .db %00111000 ; ███
+
+ .db 8,6 ;4
+ .db %00110110 ; ██ ██
+ .db %00000101 ; █ █
+ .db %11000001 ;██ █
+ .db %01100001 ; ██ █
+ .db %11000010 ;██ █
+ .db %01010001 ; █ █ █
+
+;--------------------------------- bullets ----------------------------------
spr_bullet01:
- .db 3,5
- .db %01000000
- .db %11100000
+ .db 2,1
+ .db %11000000 ;▒██
+spr_bullet02:
+ .db 4,1
+ .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 ; ██▒
+
+bullettable:
+ .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] [000:direction 00000:speed] [offset]
+;damage = min.damage + dam.inc*incs (0<=incs<=6)
+;speed in pixels/frame (>=%10010=forward; <=%01110=backwards)
+;direction: 0=straight forward; 1=up; 2=1/2up; 3=down; 4=1/2down
+
+maxnrweapons = 8+1
+weapondata:
+ .db 1,1,%00000000,0,%00000000,0,%00010010,3 ;1 single fire
+ .db 4,1,%00000000,0,%00000000,0,%00010011,3 ;2 fast single
+ .db 1,1,%00000000,0,%00010010,0,%00010010,6 ;3 double
+ .db 1,1,%01110010,2,%10010010,2,%00110010,2 ;4 triple
+ .db 3,2,%01110011,2,%10010011,2,%00110011,2 ;5
+ .db 5,3,%01110011,2,%10010100,2,%00110011,2 ;6
+ .db 7,4,%01110100,2,%10010100,2,%00110100,2 ;7
+ .db 12,5,%01110110,2,%10010110,2,%00110110,2 ;8
+maxweapon = 8
+ .db 1,1,%00000000,0,%00000000,0,%11100000,3 ;1 single laser
+ .db 1,1,%00000000,0,%11100000,0,%11100000,6 ;2 double laser
+ .db 1,1,%11100000,0,%11100000,6,%11100000,3 ;3 triple laser
+maxlaser = 11
+
+collidedamage = 4
+
+;------------------------------------ bar -----------------------------------
+
+spr_lship:
+ .db 5,3 ;li'l ship indicating lives left
+ .db %11100000 ;███
+ .db %01111000 ; ████
+ .db %11100000 ;███
+lshipsize = 5 ;space between two ship icons
+
+spr_icon:
+ .db 16,7 ;selected.......:.......:
+ .db %11111111 ;████████████████
+ .db %11000000 ;██ █
+ .db %11000000 ;██ █
+ .db %11000000 ;██ █
+ .db %11000000 ;██ █
+ .db %11000000 ;██ █
+ .db %11111111 ;████████████████
+ .db 7
+ .db %11111111
+ .db %00000001
+ .db %00000001
+ .db %00000001
+ .db %00000001
+ .db %00000001
+ .db %11111111
+spr_icon00:
+ .db 16,7 ;unused .......:.......:
+ .db %10101010 ;█ █ █ █ █ █ █ █
+ .db %11010101 ;██ █ █ █ █ █ █ █
+ .db %10101010 ;█ █ █ █ █ █ █ █
+ .db %11010101 ;██ █ █ █ █ █ █ █
+ .db %10101010 ;█ █ █ █ █ █ █ █
+ .db %11010101 ;██ █ █ █ █ █ █ █
+ .db %10101010 ;█ █ █ █ █ █ █ █
+ .db 7
+ .db %10101010
+ .db %01010101
+ .db %10101010
+ .db %01010101
+ .db %10101010
+ .db %01010101
+ .db %10101010
+spr_icon01:
+ .db 16,7 ;armor ;.......:.......:
+ .db %10000111 ;█ ███████ ▒
+ .db %10011000 ;█ ██ ██ ▒
+ .db %10110011 ;█ ██ ████ ██ ▒
+ .db %10110000 ;█ ██ ████ ██ ▒
+ .db %10110011 ;█ ██ ████ ██ ▒
+ .db %10011000 ;█ ██ ██ ▒
+ .db %10000111 ;█ ███████ ▒
+ .db 7
+ .db %11110000
+ .db %00001100
+ .db %11000110
+ .db %11100110
+ .db %11000110
+ .db %00001100
+ .db %11110000
+spr_icon02:
+ .db 16,7 ;tailbeam.......:.......:
+ .db %10000000 ;█ ▒
+ .db %10000011 ;█ ██ ▒
+ .db %10000001 ;█ ███ ▒
+ .db %10111011 ;█ ███ ██████ ██▒
+ .db %10000001 ;█ ███ ▒
+ .db %10000011 ;█ ██ ▒
+ .db %10000000 ;█ ▒
+ .db 7
+ .db %00000000
+ .db %00000000
+ .db %11000000
+ .db %11110011
+ .db %11000000
+ .db %00000000
+ .db %00000000
+spr_icon02b:
+ .db 16,7 ;torpedo .......:.......:
+ .db %10111000 ;█ ███ █ █ █▒
+ .db %10011100 ;█ ███ █ █ █▒
+ .db %10111000 ;█ ███ █ █ █ ▒
+ .db %10000000 ;█ ███ █ █ ▒
+ .db %11100001 ;███ ████ █ █▒
+ .db %10011000 ;█ ██ ████ █ █▒
+ .db %11100110 ;███ ██ ██ █ ▒
+ .db 7
+ .db %00010101
+ .db %00010101
+ .db %01001010
+ .db %11101010
+ .db %11100101
+ .db %11110101
+ .db %00110010
+spr_icon03:
+ .db 16,7 ;bullets .......:.......:
+ .db %10000000 ;█ ██ ▒
+ .db %10000011 ;█ █████ ▒▒▒ ▒
+ .db %10011000 ;█ ██ ██ ▒▒▒ ▒
+ .db %11111100 ;██████ ▒▒▒ ▒
+ .db %10011000 ;█ ██ ██ ▒▒▒ ▒
+ .db %10000011 ;█ █████ ▒▒▒ ▒
+ .db %10000000 ;█ ██ ▒
+ .db 7
+ .db %11000000
.db %11100000
+ .db %11000000
+ .db %00000000
+ .db %11000000
.db %11100000
+ .db %11000000
+spr_icon04:
+ .db 16,7 ;laser .......:.......:
+ .db %10000000 ;█ ▒
+ .db %10001010 ;█ █ █ ▒▒▒ ▒
+ .db %11101100 ;███ ██ ▒▒▒ ▒
+ .db %11110111 ;████ ███████▒▒▒█▒
+ .db %11101100 ;███ ██ ▒▒▒ ▒
+ .db %10001010 ;█ █ █ ▒▒▒ ▒
+ .db %10000000 ;█ ▒
+ .db 7
+ .db %00000000
+ .db %00000000
+ .db %00000000
+ .db %11111111
+ .db %00000000
+ .db %00000000
+ .db %00000000
+spr_icon05:
+ .db 16,7 ;multiple.......:.......:
+ .db %10000011 ;█ ███ ▒
+ .db %10000001 ;█ ████ ██ ▒
+ .db %10000001 ;█ ████ ▒
+ .db %10000011 ;█ ███ ▒
+ .db %10011000 ;█ ██ ▒
+ .db %10111100 ;█ ████ ██ ██▒
+ .db %10011000 ;█ ██ ▒
+ .db 7
+ .db %10000000
+ .db %11100110
.db %11100000
-
-spr_bullet02:
- .db 3,3
+ .db %10000000
+ .db %00000000
+ .db %11000011
+ .db %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 "v0.98.77 ",127," by Shiar",0 ;right behind txt_email
+_txt_about = $3321
+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_pressenter: .db "Enter to continue",0 ;pause
+txt_teacher: .db "(2",Lpi,"*.98)/sin 13",0 ;teacher
+txt_teacherans: .db Lneg,"14.6549373495",0
+
+;---------------------------- save data -------------------------------------
+
+storehi_start:
+hiscore .dw 0 ;default hiscore
+hiname .db "shiar.98",0 ; " " name
+storehi_end:
+
+storesave_start: ;--SAVED GAME-- defs:
+level .db 1 ;level number 1
+levelp .dw level01 ;pointer to level data l01
+pickuptimer .db 4 ;counts when to place a pickup 4
+your_ship .dw spr_ship01 ;your sprite sprs1
+your_score .dw 0 ;current score 0
+your_pickup .db 0 ;pickups already picked up 0
+your_occ .db 0 ;0=normal 1..16=exploding 0
+your_inv .db 0 ;invincibility left 0
+your_armor .db 12 ;HP left 12
+your_lives .db 3 ;lives left 3
+your_weapon .db 0 ;current weapon upgrade 0
+your_multiples .db 0 ;multiples present 0
+your_tail .db 0 ;tail beam present 0
+storesave_end:
+
+time2invert: .db 0 ;time until b<>w switch (0 at startup)
+
+;------------------------------ levels data ---------------------------------
+
+;format:boss: [moveType] [enemyType]
+; @level: [nr.dif.enemies]x [enemy nr]
+; [min. enemy frequency] [enemy frequency max.inc] [next lvl]
+; [level_info: 0000:damage 0:diagfire 0:ground 0:ceiling 0:?]
+; [level_move] [tunnel size] [groundtype]
+; [16_ground] [16_ceiling] [stars1] [stars2]
+;efrequency must be odd if halfluring!
+
+level00:
+ .db 0 ;story identifier
+ .db $21,$1d,"Cosmic year 6716" ,0,0,$1d,$06
+ .db $1b,$1d,"STORYLINE COMING SOON" ,0,0,$1d,$06
+ .db $09,$19,"STORYLINE COMING SOON" ,0,1
+ .db $2e,$21,"**** NEMESIS 86" ,0,1
+ .db $52,$36,"by Shiar" ,0,0,$19,$23
+ .db $ff ;story end
+
+ .db 20 ;boss for level01
+level01: ;intro-like, just a few enemies to begin with
+ .db 2,6,8
+ .db 26,70,20,%00010000,0,0,0
+ .db 1,2,3,4,5,6,6,5,4,3,4,5,4,5,6,5
+ .db 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
+ .db 1,1
+
+ .db 21
+level02: ;first wave of enemies; easeey
+ .db 3,6,7,8
+ .db 20,60,60,%00100000,0,0,0
+ .db 1,2,3,4,5,6,6,5,4,3,4,5,4,5,6,5
+ .db 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
+ .db 1,1
+
+ .db 22
+level03: ;some more enemies
+ .db 4,7,8,9,10
+ .db 17,40,75,%00110000,0,0,0
+ .db 1,2,3,4,5,6,6,5,4,3,4,5,4,5,6,5
+ .db 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
+ .db 1,1
+
+ .db 0,0 ;storyline ID
+ .db 1,1,"Long-Range scanners are ",
+ .db "showing",0,1
+ .db 1,8,"lots of enemy vessels on ",
+ .db "an intercept",0,1
+ .db 1,15,"course.",0,1
+ .db 1,24,"I'm changing course to a",
+ .db " nearby ",0,1
+ .db 1,31,"asteroid belt and try to",0,1
+ .db 1,38,"lose them inthere.",0,0
+ .db 1,38+5,$FF
+
+ .db 23
+level04: ;light asteroid belt
+ .db 3,1,2,4
+ .db 12,24,80,%00111000
+ .db 2,0,0
+ .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 24
+level05: ;inside asteroid belt
+ .db 5,1,2,3,4,5
+ .db 6,10,180,%01011000
+ .db 2,0,0
+ .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 25
+level02a:
+ .db 3,4,5,6
+ .db 30,1,40,%01000000
+ .db 0,0,0
+ .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 0
+
+ .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 26
+level03b:
+ .db 1,$02
+ .db $13,40,$4b,%00100100,0,-5,1
+ .db 1,2,3,4,5,6,6,5,4,3,4,5,4,5,6,5
+ .db 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
+ .db 1,1
+
+ .db 0
+
+ .db 0
+ .db $01,01,"Blablabla...",0,1
+ .db $01,34,"this storyline sux",0,0,1,39
+ .db $FF
+
+ .db 27
+level03a:
+ .db 1,$03
+ .db $2d,$3f,%00010110,0,-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
+
+ .db $07,$08
+level04b:
+ .db 1,$04
+ .db $11,$41,%00100001,0,0,0
+ .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 $07,$09
+level05a:
+ .db 1,$05
+ .db $11,$45,%00100101,%10,-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 $07,$08
+level06c:
+ .db 1,$06
+ .db $19,$3a,%00100111,0,-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 $07,$09
+level07:
+ .db 1,$07
+ .db $09,$ff,%00100001,0,0,0
+ .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
+
+;------------------------------ enemies -------------------------------------
+
+;format: [HP64] [000000:HP 00:occ] [sprite] [xpos] [appearance(ypos)]
+; [movetype] [time2fire] [firefreq]
+;appearances: 1=random; 2=lure; 3=halflure
+;case movetype:
+; 1=updown; 2=1/4x; 3=1/2x; 4=1.5x; 5=2x; 6=smart; 7=y-lure;
+; 8=y-lure 1/2x; 9=8 stop at x=99; 10=x+y-lure 1/2x
+enemyspecs:
+;1-5=asteroids
+ .db 0,%00100110,(spr_enemyA1-spr_enemy00)/2,128,1,0,0,0
+ .db 0,%00111110,(spr_enemyA2-spr_enemy00)/2,128,1,0,0,0
+ .db 0,%01011010,(spr_enemyA3-spr_enemy00)/2,128,1,4,0,0
+ .db 1,%00001010,(spr_enemyA4-spr_enemy00)/2,128,1,3,0,0
+ .db 0,%00111110,(spr_enemyA4-spr_enemy00)/2,128,1,5,0,0
+;6-10=basic enemies
+ .db 0,%00010010,(spr_enemyE1-spr_enemy00)/2,128,1,0,10,0 ;weak
+ .db 0,%00110010,(spr_enemyE4-spr_enemy00)/2,128,1,3,6,50 ;slow
+ .db 0,%00100110,(spr_enemyE2-spr_enemy00)/2,128,1,0,1,0
+ .db 0,%00101110,(spr_enemyE3-spr_enemy00)/2,128,3,0,19,39
+ .db 0,%00101010,(spr_enemyE5-spr_enemy00)/2,128,3,4,1,0 ;fast
+;11=jumping bug (up/down)
+ .db 0,%00001111,(spr_enemyN3-spr_enemy00)/2,128,2,1,87,5
+
+ .db 0,%00000011,(spr_enemy00-spr_enemy00)/2,1,0,0,0,0 ;12
+ .db 0,%00000011,(spr_enemy00-spr_enemy00)/2,1,0,0,0,0 ;13
+ .db 0,%00000011,(spr_enemy00-spr_enemy00)/2,1,0,0,0,0 ;14
+ .db 0,%00000011,(spr_enemy00-spr_enemy00)/2,1,0,0,0,0 ;15
+ .db 0,%00000011,(spr_enemy00-spr_enemy00)/2,1,0,0,0,0 ;16
+ .db 0,%00000011,(spr_enemy00-spr_enemy00)/2,1,0,0,0,0 ;17
+ .db 0,%00000011,(spr_enemy00-spr_enemy00)/2,1,0,0,0,0 ;18
+ .db 0,%00000011,(spr_enemy00-spr_enemy00)/2,1,0,0,0,0 ;19
+;20-22=first bosses
+ .db 1,%00101011,(spr_boss0_1-spr_enemy00)/2,127,1,8,20,12 ;20
+ .db 1,%00110011,(spr_boss0_1-spr_enemy00)/2,127,1,8,15,10 ;21
+ .db 1,%01001011,(spr_boss0_2-spr_enemy00)/2,127,3,9,10,9 ;22
+;23-24=asteroid bosses
+ .db 2,%00001011,(spr_boss0_3-spr_enemy00)/2,127,1,10,36,14
+ .db 2,%00110011,(spr_boss0_3-spr_enemy00)/2,127,2,10,28,12
+;25-26=big bosses
+ .db 2,%00000111,(spr_boss0_4-spr_enemy00)/2,127,3,7,18,7 ;25=bigboss1
+ .db 2,%01001011,(spr_boss0_5-spr_enemy00)/2,127,3,7,18,7 ;26=bigboss2
+
+spr_enemy00:
+ .db 16,8 ;pickup
+ .db %11111111 ; ████████████
+ .db %10000110 ; █ ██ █
+ .db %10000110 ; █ ██ █
+ .db %10111111 ; █ ████████ █
+ .db %10111111 ; █ ████████ █
+ .db %10000110 ; █ ██ █
+ .db %10000110 ; █ ██ █
+ .db %11111111 ; ████████████
+ .db 8
+ .db %11110000
+ .db %00010000
+ .db %00010000
+ .db %11010000
+ .db %11010000
+ .db %00010000
+ .db %00010000
+ .db %11110000
+ .db 0
+
+spr_enemyA1:
+ .db 7,6 ;asteroid one
+ .db %00011000 ; ██
+ .db %01101100 ; ██ ██
+ .db %10011110 ;█ ████
+ .db %11111010 ;█████ █
+ .db %10111100 ;█ ████
+ .db %01110000 ; ███
+spr_enemyA2:
+ .db 8,7 ;asteroid two
+ .db %00111100 ; ████
+ .db %01011010 ; █ ██ █
+ .db %01101101 ; ██ ██ █
+ .db %11111101 ;██████ █
+ .db %11111111 ;████████
+ .db %10110110 ;█ ██ ██
+ .db %01100000 ; ██
+ .db 0
+spr_enemyA3:
+ .db 8,8 ;asteroid three
+ .db %00011110 ; ████
+ .db %01110011 ; ███ ██
+ .db %01111101 ; █████ █
+ .db %10110111 ;█ ██ ███
+ .db %11111110 ;███████
+ .db %11111101 ;██████ █
+ .db %01010111 ; █ █ ███
+ .db %00001110 ; ███
+spr_enemyA4:
+ .db 7,6 ;asteroid four
+ .db %01111000 ; ████
+ .db %10110110 ;█ ██ ██
+ .db %11111101 ;██████ █
+ .db %01111011 ; ████ ██
+ .db %01001110 ; █ ███
+ .db %00110000 ; ██
+
+spr_enemyE1:
+ .db 6,7 ;weak
+ .db %00111100 ; ████
+ .db %01000100 ; █ █
+ .db %10111000 ;█ ███
+ .db %11100000 ;███
+ .db %10111000 ;█ ███
+ .db %01000100 ; █ █
+ .db %00111100 ; ████
+ .db 0
+spr_enemyE2:
+ .db 6,6 ;weak
+ .db %00111100 ; ████
+ .db %01010000 ; █ █
+ .db %10100000 ;█ █
+ .db %10100000 ;█ █
+ .db %01010000 ; █ █
+ .db %00111100 ; ████
+spr_enemyE3:
+ .db 6,6 ;normal solid (Galaxian enemy)
+ .db %00111100 ; ████
+ .db %01110000 ; ███
+ .db %11110000 ;████
+ .db %11110000 ;████
+ .db %01110000 ; ███
+ .db %00111100 ; ████
+spr_enemyE4:
+ .db 6,7
+ .db %00011100 ; ███
+ .db %01101000 ; ██ █
+ .db %10011000 ;█ ██
+ .db %01110000 ; ███
+ .db %10011000 ;█ ██
+ .db %01101000 ; ██ █
+ .db %00011100 ; ███
+ .db 0
+spr_enemyE5:
+ .db 6,6 ;speedy
+ .db %00011100 ; ███
+ .db %01111000 ; ████
+ .db %11100000 ;███
+ .db %11100000 ;███
+ .db %01111000 ; ████
+ .db %00011100 ; ███
+
+spr_enemyG1:
+ .db 8,6 ;G-Type
+ .db %00111111 ; █████
+ .db %01001000 ; █ █
+ .db %10110100 ;█ ██ █
+ .db %10110100 ;█ ██ █
+ .db %01001000 ; █ █
+ .db %00111111 ; █████
+spr_enemyG2:
+ .db 8,6 ;smaller nacelles
+ .db %00000111 ; ███
+ .db %01101100 ; ██ ██
+ .db %10110100 ;█ ██ █
+ .db %10110100 ;█ ██ █
+ .db %01101100 ; ██ ██
+ .db %00000111 ; ███
+spr_enemyG3:
+ .db 8,6 ;shuttle
+ .db %00001111 ; ████
+ .db %01111100 ; █████
+ .db %10011100 ;█ ███
+ .db %10011100 ;█ ███
+ .db %01111100 ; █████
+ .db %00001111 ; ████
+spr_enemyG4:
+ .db 8,6 ;G-Type solid
+ .db %00111111 ; █████
+ .db %01111000 ; ████
+ .db %11111100 ;██████
+ .db %11111100 ;██████
+ .db %01111000 ; ████
+ .db %00111111 ; █████
+spr_enemyG5:
+ .db 6,6 ;G lost his head; large window ;)
+ .db %01111100 ; █████
+ .db %10110000 ;█ ██
+ .db %10111000 ;█ ███
+ .db %10111000 ;█ ███
+ .db %10110000 ;█ ██
+ .db %01111100 ; █████
+spr_enemyG6:
+ .db 7,6 ;small G-type
+ .db %00011110 ; ████
+ .db %01111000 ; ████
+ .db %11110000 ;████
+ .db %11110000 ;████
+ .db %01111000 ; ████
+ .db %00011110 ; ████
+
+spr_enemyS1:
+ .db 6,6 ;solid
+ .db %00111000 ; ███
+ .db %01111100 ; █████
+ .db %11111000 ; █████
+ .db %11111000 ; █████
+ .db %01111100 ; █████
+ .db %00111000 ; ███
+spr_enemyS2:
+ .db 7,6 ;some attack vessel
+ .db %00011100 ; ███
+ .db %01110010 ; ███ █
+ .db %10101100 ; █ █ ██
+ .db %10101100 ; █ █ ██
+ .db %01110010 ; ███ █
+ .db %00011100 ; ███
+spr_enemyS3:
+ .db 7,6 ;interceptor
+ .db %00011110 ; ████
+ .db %01111110 ; ██████
+ .db %11111100 ; ██████
+ .db %11111100 ; ██████
+ .db %01111110 ; ██████
+ .db %00011110 ; ████
+spr_enemyS4:
+ .db 8,6 ;cheap intercept
+ .db %00011011 ; ██ ██
+ .db %01110110 ; ███ ██
+ .db %10111100 ; █ ████
+ .db %10111100 ; █ ████
+ .db %01110110 ; ███ ██
+ .db %00011011 ; ██ ██
+
+spr_enemyN1:
+ .db 8,7 ;some cool Nemesis-MSX enemy
+ .db %00111110 ; █████
+ .db %11110001 ;████ █
+ .db %00001110 ; ███
+ .db %00010101 ; █ █ █
+ .db %00001110 ; ███
+ .db %11110001 ;████ █
+ .db %00111110 ; █████
+ .db 0
+spr_enemyN2:
+ .db 8,7 ;
+ .db %00111110 ; █████
+ .db %00011101 ; ███ █
+ .db %11111111 ;████ ███
+ .db %01110110 ; ██ ███
+ .db %11111111 ;████ ███
+ .db %00011101 ; ███ █
+ .db %00111110 ; █████
+ .db 0
+spr_enemyN3:
+ .db 8,7 ;Nem3MSX jumper lvl#3
+ .db %10111110 ;█ █████
+ .db %01011101 ; █ ███ █
+ .db %01111110 ; ██████
+ .db %00010100 ; █ █
+ .db %01111110 ; ██████
+ .db %01011101 ; █ ███ █
+ .db %10111110 ;█ █████
+ .db 0
+
+spr_boss0_1:
+ .db 16,10 ;boss type one..:.......:
+ .db %00000001 ; ██████ ██
+ .db %00001110 ; ███ █ ███
+ .db %00110010 ; ██ █ ████
+ .db %01001101 ; █ ██ ██
+ .db %11101011 ;███ █ ██ █
+ .db %11101011 ;███ █ ██ █
+ .db %01001101 ; █ ██ ██
+ .db %00110010 ; ██ █ ████
+ .db %00001110 ; ███ █ ███
+ .db %00000001 ; ██████ ██
+ .db 10
+ .db %11111011
+ .db %00101110
+ .db %11110000
+ .db %10000000
.db %01000000
- .db %11100000
.db %01000000
-
-spr_enemy01:
- .db 6,6
- .db %00111100
- .db %01110000
+ .db %10000000
.db %11110000
+ .db %00101110
+ .db %11111011
+ .db 0
+spr_boss0_2:
+ .db 16,10 ;boss type two..:.......:
+ .db %11111110 ;███████
+ .db %00000011 ; ███ ████
+ .db %00110101 ; ██ █ ████ █
+ .db %01111010 ; ████ █ █ █ ██
+ .db %10001101 ;█ ██ █ ██ ██
+ .db %10001101 ;█ ██ █ ██ ██
+ .db %01111010 ; ████ █ █ █ ██
+ .db %00110101 ; ██ █ ████ █
+ .db %00000011 ; ███ ████
+ .db %11111110 ;███████
+ .db 9
+ .db %00000000
+ .db %10001111
+ .db %11100001
+ .db %10010110
+ .db %01101100
+ .db %01101100
+ .db %10010110
+ .db %11100001
+ .db %10001111
+spr_boss0_3:
+ .db 16,11 ;bigasteroid one
+ .db %00011110 ; ████
+ .db %01110011 ; ███ ███
+ .db %01111111 ; ███████ █
+ .db %01111111 ; █████████
+ .db %11111110 ;███████ ███
+ .db %11111111 ;███████████
+ .db %11111111 ;████████████
+ .db %10111110 ;█ █████ ████
+ .db %01011111 ; █ ███████
+ .db %00110111 ; ██ ███
+ .db %00001110 ; ███
+ .db 9
+ .db %00000000
+ .db %10000000
+ .db %01000000
+ .db %11000000
+ .db %11100000
+ .db %11100000
.db %11110000
+ .db %11110000
+ .db %11000000
+ .db 0
+spr_boss0_4:
+ .db 16,18 ;bigboss one :
+ .db %00000000 ; █ █
+ .db %00000111 ; ███ ███
+ .db %00000011 ; ████ █
+ .db %00000001 ; ██ ██
+ .db %00000011 ; ███ ██
+ .db %00000000 ; █████
+ .db %00010111 ; █ ██████████
+ .db %00111111 ; ██████ ██ ██
+ .db %11111000 ;█████ ██ █ ███
+ .db %00001111 ; █████ ██ █ █
+ .db %11111000 ;█████ ██ █ ███
+ .db %00111111 ; ██████ ██ ██
+ .db %00010111 ; █ ██████████
+ .db %00000000 ; █████
+ .db %00000011 ; ███ ██
+ .db %00000001 ; ██ ██
+ .db %00000011 ; ████ █
+ .db %00000111 ; ███ ███
+ .db 19 ; █ █
+ .db %01010000 ;modelled after a Nemesis][MSX boss
.db %01110000
- .db %00111100
-
-spr_explosion:
- .db 8,6
- .db %00000000
- .db %00011100
- .DB %00111110
- .DB %01010110
- .DB %00111000
- .DB %00000000
- .db 8,6
- .db %00110000
- .db %01001110
- .DB %10111110
- .DB %01001111
- .DB %00111000
- .DB %00011010
- .db 8,6
- .db %11110011
- .db %01001110
- .DB %10110101
- .DB %01000101
- .DB %00111110
- .DB %11011010
- .db 8,6
- .db %11110011
- .db %01001110
- .DB %10110101
- .DB %01000101
- .DB %00111110
- .DB %11011010
- .db 8,6
- .db %01000001
- .db %00100110
- .DB %00010101
- .DB %01000100
- .DB %00010010
- .DB %10011010
- .db 8,6
- .db %01000010
- .db %00100000
- .DB %00000001
- .DB %01000100
- .DB %00100010
- .DB %10001010
- .db 8,6
- .db %00001000
- .db %11000010
- .DB %00000000
- .db %00100000
- .db %00000001
- .db %00110000
- .db 8,6
- .db %00000100
- .DB %00000000
- .DB %01000000
- .DB %00000000
- .db %00000001
- .db %00100100
-
-;---------------------------- level data -------------------------------------
-Leveldata:
- .db $90,$40
- .db $90,$30
- .db $90,$20
- .db $90,$10
- .db $00,$00
-
-;---------------------------- texts ------------------------------------------
-
-title_message:
- .db "G A L A X I A N",0
-
-;---------------------------- save data --------------------------------------
-
-stored_data_start:
-
-curevent .dw Leveldata ;next event
-nextevent .db (Leveldata) ;time to next event
-score .dw $0000
-lives .dw $0003
-level .dw $0003
-x .db $46
-y .db $46
-lasers .db $03
-ybullets .dw 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-ebuls .dw 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-enemies .dw $3335,$2323,$4040,$ffff,$ffff
- .dw $ffff,$ffff,$ffff,$ffff,$ffff
- .dw 0,0,0,0,0
- .dw 0,0,0,0,0
- .dw 0,0,0,0,0,0,0,0,0,0
- .dw 0,0,0,0,0,0,0,0,0,$ffff
-
-boss_status .db 00
-boss_pwr .db 00
-boss_x .db 00
-boss_y .db 00
-boss_2bytes .dw 0000
-
-timer .dw $0000
-your_status .db $00
- .db $00
-warped_status .db $00
-
-variables_end:
-
-stored_data_end:
-
+ .db %11010000
+ .db %10110000
+ .db %10110000
+ .db %11111000
+ .db %11111110
+ .db %01101100
+ .db %11010111
+ .db %10110101
+ .db %11010111
+ .db %01101100
+ .db %11111110
+ .db %11111000
+ .db %10110000
+ .db %10110000
+ .db %11010000
+ .db %01110000
+ .db %01010000
+spr_boss0_5:
+ .db 16,15 ;bigboss two :
+ .db %00001111 ; █████
+ .db %00111110 ; █████ █████
+ .db %01111101 ; █████ █ ███████
+ .db %00000011 ; ██
+ .db %00000100 ; █ █
+ .db %00000011 ; █████
+ .db %00011110 ; ████ ██ ████
+ .db %11110011 ;████ ██ █ █
+ .db %00011110 ; ████ ██ ████
+ .db %00000011 ; █████
+ .db %00000100 ; █ █
+ .db %00000011 ; ██
+ .db %01111101 ; █████ █ ███████
+ .db %00111110 ; █████ █████
+ .db %00001111 ; █████
+ .db 15 ;modelled after a Nemesis][MSX boss
+ .db %10000000
+ .db %11111000
+ .db %01111111
+ .db %00000000
+ .db %10000000
+ .db %11100000
+ .db %11011110
+ .db %01010000
+ .db %11011110
+ .db %11100000
+ .db %10000000
+ .db %00000000
+ .db %01111111
+ .db %11111000
+ .db %10000000
+ .db 0
+
+;----------------------------------------------------------------------------
+;----------------------------- logo ------------------------------------------
+;----------------------------------------------------------------------------
+
+logo_nemesis:
+.db %11111111,%11111111,%11111111,%11111110,%11111111,%11110111,%11111111,%11111110,%11111111,%111101111,%11111111,%00001011,%11111111,%11111111,%11111111,%11111110
+.db %01111111,%11111111,%11111111,%11111110,%11111111,%11110111,%11111111,%11111110,%11111111,%111101111,%11111111,%00011011,%11111111,%11111111,%11111111,%11111100
+.db %00111111,%11111111,%11111111,%11111110,%11111111,%11110111,%11111111,%11111110,%11111111,%111101111,%11111111,%00111011,%11111111,%11111111,%11111111,%11111000
+.db %00011111,%11111111,%11111111,%11111110,%11111111,%11110111,%11111111,%11111110,%11111111,%111101111,%11111111,%01111011,%11111111,%11111111,%11111111,%11110000
+.db %00000000,%00000000,%00000001,%00011110,%00010000,%00000000,%10000001,%00011110,%00010000,%000000001,%00000000,%00001000,%01000000,%00000000,%00000000,%00000000
+.db %00000000,%00000000,%00000011,%00011110,%00110000,%00000001,%10000011,%00011110,%00110000,%000000011,%00000000,%00011000,%11000000,%00000000,%00000000,%00000000
+.db %00000000,%00000000,%00000111,%00011110,%01110000,%00000011,%10000111,%00011110,%01110000,%000000111,%00000000,%00111001,%11000000,%00000000,%00000000,%00000000
+.db %00000000,%00000000,%00001111,%00011110,%11111111,%00000111,%10001111,%00011110,%11111111,%000001111,%11111111,%01111011,%11111111,%11000000,%00000000,%00000000
+.db %00000000,%00000000,%00001111,%00011110,%11111111,%00000111,%10001111,%00011110,%11111111,%000001111,%11111111,%01111011,%11111111,%11000000,%00000000,%00000000
+.db %00000000,%00000000,%00001111,%00011110,%11111111,%00000111,%10001111,%00011110,%11111111,%000001111,%11111111,%01111011,%11111111,%11000000,%00000000,%00000000
+.db %00000000,%00000000,%00001111,%00011110,%11111111,%00000111,%10001111,%00011110,%11111111,%000001111,%11111111,%01111011,%11111111,%11000000,%00000000,%00000000
+.db %00000000,%00000000,%00001111,%00011110,%11110000,%00000111,%10001111,%00011110,%11110000,%000000000,%00001111,%01111000,%00000011,%11000000,%00000000,%00000000
+.db %00000000,%00000000,%00001111,%00011110,%11110000,%00000111,%10001111,%00011110,%11110000,%000000000,%00001111,%01111000,%00000011,%11000000,%00000000,%00000000
+.db %00000000,%00000000,%00001111,%00011110,%11110000,%00000111,%10001111,%00011110,%11110000,%000000000,%00001111,%01111000,%00000011,%11000000,%00000000,%00000000
+.db %00000000,%00000000,%00001111,%00011110,%11110000,%00000111,%10001111,%00011110,%11110000,%000000000,%00001111,%01111000,%00000011,%11000000,%00000000,%00000000
+.db %00000000,%00000000,%00001111,%00011110,%11111111,%11110111,%10001111,%00011110,%11111111,%111101111,%11111111,%01111011,%11111111,%11000000,%00000111,%11010001
+.db %00000000,%00000000,%00001111,%00011110,%11111111,%11110111,%10001111,%00011110,%11111111,%111101111,%11111111,%01111011,%11111111,%11000000,%00000001,%00011011
+.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
+;----------------------------------------------------------------------------
+;----------------------------------------------------------------------------
+;----------------------------------------------------------------------------
-
-;NEMESIS'86 by Shiar
-
-
-;0.01.717 -- 17.VII.99 -- size 984
+; 0.98.77 -- 7.VII.00 -- size 6707
;
-; + movement of ship over whole screen
-; + enemies moving from right to left, appearing right at specified times
-
-
-
-
+; # 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
+; - removed contrast changes
+; + 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)
+; + random enemy is chosen from any number of enemies per level
+; * time to first enemy fire defined per enemy, not per level
+; + CLIPPED sprites!! no more in/out popping enemies! wow...
+; * bullets/enemies removed when _entirely_ off screen
+; # enemies would sometimes be hit by bullets going right below them
+; # size of the second bullet was too big (invisible hit)
+; * the frequency an enemy fires bullets is defined per enemy
+; + wide clipped sprites implemented (width 1-16 pixels)
+; # bosses first move left until x=100, otherwise they'd be off-screen
+; * at status bar left below ships are displayed for lives left
+; * armor bar is two pixels high (better visible)
+; # bullet overflow fixed again (>63 bullets fired)
+; # correct weapon loaded when continuing a saved game
+; # game freezed when generating a random value <=1
+; * you explode in a different way than the enemies
+; + screen inverts for a brief time when you are hit!
+; # stats-bar was messed up when ya got 0 lives left
+; * two new (big) bosses modeled after a common MSX Nemesis2-boss
+; * score increased once every 32 frames (instead of every 256)
+; # ground fixed for new random routine (smaller routine; incs -2 to 2)
+; + laser will upgrade as well when you reselect it
+; * 2nd can be used in main menu (wow!)
+; # altered variable storage space because of Nemesis grew beyond 6kb
+; # fixed armor bar display when at maximum
+; + a few new enemies (asteroids) and remade 1st 4 levels; new pickup
+; - torpedo since it was kinda useless
+; + second icon now selects TAIL BEAM: bullet going backwards
+; # armor increase at the end of a level doesn't overflow armorbar
+; + you can choose your own ship out of four vessel after NEW GAME!
+; + enemies can appear at any x-position and move both left and right
+; + move patterns given per enemy, not per level
+; * new (faster) enemy-move system; 10 basic moves (x2 left+right)
+; # enemies can _never_ move above or below visible screen
+; * "randomY"-enemies are placed entirely on screen (height calced)
+; # the major TI-OS crash bug WAS afterall caused by sprites drawn
+; (partially) outside screen memory. temporarily fixed by setting
+; virtual screen buffer to $8200 (enough mem there)
+; + upto 29 cool enemy sprites and redone first five levels
+; * improved enemy-move routine; smooth luring, five speeds+backwards
+; # after pause weapon will not be fired
+; # teacher key fixed (waits for GRAPH to be release before&after)
+;
+; + added - removed * changed # bug fixed
\ No newline at end of file
git.shiar.nl / nemesis.git / blobdiff