- .include "asm86.h"
+ .include "asm86.h"
.include "ti86asm.inc"
- .include "ti86abs.inc"
+
.org _asm_exec_ram
+
+TEXT_MEM = _textShadow
+
nop
- jp Start
- .dw $0000
- .dw Title
-Title: .db "Nemesis v0.01 by Shiar",0
-Start: call _runindicoff
+ jp init
+ .dw $0001 ;description type 2 (= +YASicon)
+ .dw Title ;pointer to description
+ .dw spr_ship ;pointer to YAS icon
-TEXT_MEM = $c0f9
-temp1 = $c120
-StringPlace = $c180
-jpf1 = $c200
+Title: .db "Nemesis v0.8.93 by Shiar",0
+just_fired = TEXT_MEM ;byte
+temp1 = TEXT_MEM+1 ;word
+RanPos = TEXT_MEM+3 ;byte
-;-------------------- init ----------------------------------------------------
+;---------------------- init --------------------------------------------------
init:
- set 0,(iy+3)
- ld (iy+13),0
+ call _runindicoff ;turn the run-indicator off, obviously
+ call _clrLCD ;clean the screen
+
+ ld a,(CONTRAST) ;load current contrast level
+ cp $1f ;if already at maximum...
+ jr z,skipdarken ;...then skip level increase
+ inc a ;otherwise increase contrast level
+skipdarken:
+ out (2),a ;set it
+
+;---------------------- main menu ---------------------------------------------
+
+LogoPut:
+ ld hl,logo_nemesis ;from...
+ ld de,VIDEO_MEM+16 ;...to one line from top
+ ld a,19 ;19 rows
+LogoLoop:
+ ld bc,16 ;set screen width
+ ldir ;display one line
+ dec a ;decrease line-counter
+ jr nz,LogoLoop ;repeat when counter is not yet zero
+
+menutext:
+ ld hl,$1608 ;just below logo
+ ld (_penCol),hl
+ ld hl,txt_about ;display "by Shiar (ICQ#43840958)"
+ call _vputs
-;-------------------- main menu -----------------------------------------------
+ ld hl,$0705 ;located one row above bottom
+ ld (_curRow),hl ;go there
+ ld hl,txt_1player ;display "ONE PLAYER"
+ call _puts
+ ld hl,$0706 ;below oneplayer text
+ ld (_curRow),hl
+ ld hl,txt_2players ;display "TWO PLAYERS"
+ call _puts
+
+ call _getkey ;wait for keypress
+ call New_level ;prepare level
- jp play_game
+;------------------------------------------------------------------------------
+;---------------------- game loop ---------------------------------------------
+;------------------------------------------------------------------------------
+
+game_main_loop:
+ ld hl,timer ;update time
+ inc (hl)
-;-------------------- exit ----------------------------------------------------
+Clear_screen:
+ xor a ;empty bitmask
+ ld hl,GRAPH_MEM ;screen location (top left)
+ ld b,$E0 ;loop 0E0h = 224 times = 256-32 for score-bar)
+clearloop:
+ ld (hl),a ;clear four times (total = 224*4 = 896 bytes)
+ inc hl
+ ld (hl),a
+ inc hl
+ ld (hl),a
+ inc hl
+ ld (hl),a
+ inc hl
+ djnz clearloop ;repeat 224x
+
+check_exitkey:
+ ld a,%00111111 ;<exit> pressed?
+ out (1),a
+ nop \ nop
+ in a,(1)
+ bit 6,a ;test bit 6 = <EXIT>
+ jr z,quit ;yes: quit game
+
+game_stuff:
+ call Level_event ;insert enemies
+ call Handle_Ship ;move you
+ call Fire_bullet ;check for fire
+ call Handle_enemies ;move enemies
+ call Handle_bullets ;move your bullets
+ call Enemy_bullets ;move enemy bullets
+ call Enemies_hit ;check for collision with enemies
+
+ call Display_Screen ;display all
+; halt \ halt ;delay
+ jr game_main_loop ;loop
+
+;--------------------------- exit ---------------------------------------------
+
+quit:
+ ld a,(CONTRAST) ;load original contrast level
+ out (2),a ;and set it back
+ ret ;quit Nemesis :(
+
+;--------------------------- display ------------------------------------------
-exit_game:
+Display_Screen:
+ ld hl,GRAPH_MEM ;from storage (top left)
+ ld de,VIDEO_MEM ;to screen (top left)
+ ld a,56 ;display height = 64 bytes (minus 8 for bar)
+displayloop:
+ ld bc,16 ;display width = 16 bytes (16*8bits=256pixels)
+ ldir ;16x de >> hl
+ dec a ;next line
+ jr nz,displayloop ;loop 64x
+
+ ld hl,$3946 ;Display Armor left
+ ld (_penCol),hl ;place @ armorIcon
+ ld a,(your_armor) ;load armor left
+ add a,'0' ;make digit
+ call _vputmap ;display char
+
+ ld hl,$396b ;Display Score
+ ld (_penCol),hl ;bottom right of screen
+ ld hl,(timer)
+ ld h,0
+
+_D_HL_DECI: ;------- display 5-digit value -------
+ ld de,savestr+4 ;savenr saves number string
+ ld b,5 ;five digits
+ldhld: call UNPACK_HL ;one digit of hl
+ add a,'0' ;make number
+ ld (de),a ;save into savenr
+ dec de ;point to next digit
+ djnz ldhld ;repeat for all digits
+
+ ld hl,savestr
+ call _vputs ;display string
ret
-;----------------------- game setup -------------------------------------------
+savestr:
+ .db "SHIAR",0
-play_game:
- ld hl,stored_data_start
- ld bc,variables_end-stored_data_start-1
+;------------------------- handle ship ----------------------------------------
-;---------------------- display setup ----------------------------------------
+Handle_Ship:
+ ld a,(your_occ)
+ or a
+ jr z,ok ;0 = normal stat
-set_up_display:
- call _clrLCD
+ inc a ;next (explosion)frame
+ ld (your_occ),a ;save
- 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
+ cp 34 ;last explosion frame?
+ jr c,exploding_you ;not yet: display explosion
+ cp 40 ;delay finished?
+ jp z,game_over ;yes = game over
+ ret ;don't display anything
-;------------------------ in-game texts ---------------------------------------
+ok:
+ ld a,%01111110
+ out (1),a
+ ld hl,y
+ in a,(1)
+ rra ;rotate right (put last bit in c)
+ ld b,a ;we need a
+
+ jr c,no_down
+ ld a,(hl)
+ cp 49 ;55-6 = bottom of screen
+ jr z,no_down
+ inc a
+ ld (hl),a
+no_down:
+ dec hl
+ rr b ;because we now use b, it's rr instead of rra
+ jr c,no_left
+ ld a,(hl)
+ sub 1 ;<dec a> doesn't affect c-flag
+ jr c,no_left ;-1 = left side
+ ld (hl),a
+no_left:
+ rr b
+ jr c,no_right
+ ld a,(hl)
+ cp 121 ;127-6 = right side
+ jr z,no_right
+ inc a
+ ld (hl),a
+no_right:
+ ld d,(hl)
+ inc hl
+ rr b
+ jr c,no_up
+ ld a,(hl)
+ sub 1 ;<dec a> doesn't affect carry-flag
+ jr c,no_up ;-1 = top of screen
+ ld (hl),a ;save new y
+
+no_up: ld e,(hl)
+ ld ix,spr_ship01 ;ship sprite
+ ld hl,your_inv ;invulnerable?
+ ld a,(hl) ;load time in a
+ or a ;is it 0?
+ jp z,putsprite ;yes so ship = normal (display \ ret)
+
+ ld b,a ;save inv-time
+ ld a,(timer) ;load frame nr.
+ and %00000011 ;a=0 once every four frames
+ jr nz,not_time ;a<>0 = not time to update counter
+ dec (hl) ;decrease inv-time left
+not_time:
+ and %00000010 ;a switches 0<->1 every 2 frames
+ jr z,no_flicker ;don't show normal sprite anyway
+ ld a,b ;pop inv-time
+ and %11110000 ;inv-time <16 ticks left?
+ jp z,putsprite ;yes: display normal sprite
+
+no_flicker:
+ ld ix,spr_ship01i ;display inv-ship (ld ix is faster than add ix)
+ jp putsprite ;ret
+
+exploding_you:
+ srl a ;half the framerate
+ dec a ;first frame is 1>inc>srl>dec = 0
+ ld hl,x-1
-in_game_text:
- .db 16,0,"LIVES",0
- .db 16,3,"LEVEL",0
- .db 16,6,"SCORE",0
+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
+ ld e,(hl)
+ jp putsprite
+
+damage_you:
+ ld a,(your_inv) ;invulnerability left?
+ or a
+ ret nz ;return if inv>0
+ ld hl,your_armor ;armor left
+ ld a,(hl) ;check
+ dec a ;is it 0?
+ jp m,no_armor ;yes, 0hp left so explode
+ ld (hl),a ;no, so save decreased hp
+ ret ;and return
+no_armor:
+ ld a,%01 ;occ %xxxxxx01 = explode
+ ld (your_occ),a ;set to explode
+ ret
-str_question:
- .db "-----",0
+;------------------------- fire bullet ----------------------------------------
-;-------------------------- game loop -----------------------------------------
+Fire_bullet:
+ ld a,(your_occ) ;are you 100% OK?
+ or a ;a=0??
+ ret nz ;return if not normal stat
-game_main_loop:
- ld hl,timer
- inc (hl)
+ ld a,%00111111 ;function keys (F1-F5)
+ out (1),a ;ask for them
+ ld hl,just_fired ;usefull delay 10 clocks (nop\nop is 8)
+ in a,(1) ;get zem!
+ bit 4,a ;test bit 4 = F1-key
+ jr z,fire ;fire pressed?
+ ld (hl),0 ;no: reset just_fired
+ ret
- xor a
- ld hl,GRAPH_MEM+(16*12)
- ld b,a
-csl: ld (hl),a
+fire: ld a,(hl) ;just_fired
+ or a ;zero when first time
+ ret nz ;return when already pressed
+ ld (hl),1 ;set just_fired
+
+ ld hl,ybullets
+ ld de,3
+ ld b,10
+find_ybullet:
+ ld a,(hl)
+ or a
+ jr z,found_ybullet ;0 = no bullet here
+ add hl,de
+ djnz find_ybullet ;look next bullet
+ ret
+
+found_ybullet:
+ ld (hl),1 ;use bullet
inc hl
- ld (hl),a
+ ld a,(x)
+ add a,5
+ ld (hl),a ;set x
+ ld a,(y)
+ add a,2
inc hl
- ld (hl),a
+ ld (hl),a ;set y
+ ret
+
+;------------------------ handle bullets --------------------------------------
+
+remove_bullet:
+ dec hl
+ ld (hl),0 ;dump this bullet!
+ ret
+
+Handle_bullets:
+ ld hl,ybullets
+ ld b,10
+scan_bullets:
+ push bc
+ push hl
+ ld (temp1),hl
+ ld a,(hl)
inc hl
- djnz csl
+ dec a ;type 1?
+ call z,bullet_2left ;yes: 2left
+ pop hl
+ pop bc
+ ld de,3
+ add hl,de ;3 x <inc hl>
+ djnz scan_bullets ;next bullet (loop)
+ ret
- call Level_event
- call Handle_Ship
- call Handle_enemies
- call Display_Screen
- call Misc_Keys
- jr game_main_loop
+bullet_2left:
+ ld a,(hl) ;d = X
+ inc a ;move right
+ cp 122 ;off screen? (x=127-5) &&&
+ jr z,remove_bullet
+ inc a ;move right
+ cp 122 ;off screen?
+ jr z,remove_bullet
+ ld (hl),a ;save new pos.
+ ld d,a
+ inc hl ;to y-pos
+ ld e,(hl) ;e = Y
+ ld ix,spr_bullet01
+ push de
+ call putsprite ;display bullet
+ pop de
+ ld b,nrenemies
+ ld hl,enemies
-;---------------------- display -----------------------------------------------
+hit_enemies: ;Hits with normal enemies
+ push hl
-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
- dec a
- jr nz,dsl
+ ld a,(hl)
+ and %00000010
+ jr z,nohit ;no hit when enemy_occ <> 2/3
- ld hl,$1007 ;Display Score
- ld (_curRow),hl
- ld hl,(score)
-; jp _D_HL_DECI
- ret
+ inc hl ;enemy type
+ ld a,(hl)
+ or a ;enemy #0 = pickup
+ jr z,nohit ;yes: don't destroy
-;------------------------- handle ship ----------------------------------------
+ inc hl
+ ld a,(hl) ;check x
+ sub d
+ add a,5
+ jp m,nohit
+ cp 8
+ jr nc,nohit
-Handle_Ship:
- ld a,(your_status)
- bit 4,a
- jr nz,you_not_normal
- or a
- jr z,ok
- dec a
- ld (your_status),a
- ld hl,(lives)
- ld a,l
- or h
- jr nz,ok
- pop af
- ret
-ok:
- ld a,%01111110
- out (1),a
- ld hl,y
- in a,(1)
- rra
- ld b,a
-
- jr c,no_down
- ld a,(hl)
- inc a
- cp 73 ;y < 73
- jr z,no_down
- ld (hl),a
-no_down: dec hl
- rr b
- jr c,no_left
- ld a,(hl)
- dec a
- jr z,no_left ;x > 0
- ld (hl),a
-no_left: rr b
- jr c,no_right
- ld a,(hl)
- inc a
- cp 89 ;x < 89
- jr z,no_right
- ld (hl),a
-no_right:ld d,(hl)
- inc hl
- rr b
- jr c,no_up
- ld a,(hl)
- dec a
- cp 15 ;y > 15
- jr z,no_up
- ld (hl),a
-no_up:
- ld ix,spr_ship
-
-display_common:
- ld e,(hl)
- jp drw_spr
-
-you_not_normal:
-
- ld hl,(score)
- ld de,-6
- add hl,de
- ld a,255
- cp h
- jr nz,_ok_
- ld hl,0
-_ok_: ld (score),hl
- ld a,(your_status)
- dec a
- ld (your_status),a
- inc a
- and 14
- xor 14
- ld hl,x-1
+ inc hl
+ ld a,(hl) ;check y
+ sub e
+ add a,5
+ jp m,nohit
+ cp 10
+ jr nc,nohit
-explosion_stuff:
- rra
- add a,a
- add a,a
- add a,a
- ld c,a
- ld b,0
- ld ix,spr_explosion
- add ix,bc
- inc hl
- ld d,(hl)
- inc hl
- jr display_common
-
-;---------------------------- handle keys -------------------------------------
-
-Misc_Keys:
- ld a,$BF
- out (1),a
- nop
- nop
- in a,(1)
- rla
- rla
- jr nc,e_exit
+ xor a
+ push hl
+ ld hl,(temp1)
+ ld (hl),a ;remove bullet
+ pop hl
- ld a,$FD
- out (1),a
- nop
- nop
- in a,(1)
- rra
- bit 5,a
- ret nz
-e_exit: pop af
+ dec hl
+ dec hl
+ dec hl
+ ld a,(hl) ;occ
+ ld b,a ;push occ
+ and %11111100 ;occ/4 = HP left ;<srl a\srl a
+ jr nz,hpleft ;not zero -> jump
+ ld (hl),%01 ;set to explode
+
+ ld a,(RanPos) ;use random var
+ and %01011011 ;matches 0 100/2/2/2/2/2=3% of the time
+ jr nz,pickupdone ;otherwise just explode
+ ld (hl),%00000110 ;change it into a pickup (with 2 HP)
+pickupdone:
+ inc hl
+ ld b,(hl) ;save enemy type
+ ld (hl),$00 ;explosionFrame 0
+
+ pop hl
+ ret
+
+hpleft:
+ ld a,b ;pop occ
+ sub %00000100 ;decrease HP by one
+ ld (hl),a ;save
+ pop hl
+ ret
+
+nohit:
+ pop hl
+ inc hl
+ inc hl
+ inc hl
+ inc hl
+ djnz hit_enemies ;check next enemy
ret
;--------------------------- level events -------------------------------------
Level_event:
- ld a,(nextevent)
- dec a
- ld (nextevent),a
- or a
- ret nz
+ 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 a,(eventtime) ;enemy frequency (lvl)
+ 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 nz,do_event ;nope: wait for enemies to leave
+ inc hl ;nextevent located behind eventleft
+ ld (hl),119 ;set delay
+ ret ;don't place any more enemies
do_event:
- ld hl,(curevent)
- inc hl
-
- ld de,enemies
- dec de
- dec de
-search_noenemy:
+ ld de,enemies-4
+chk_noenemy:
+ inc de
inc de
inc de
- ld a,(de)
- cp $ff
- jr nz,search_noenemy
-
- ld a,$5a
- ld (de),a
inc de
+ ld a,(de)
+ or a ;0 = no enemy present
+ jr nz,chk_noenemy
+
+place_enemy:
+ ld a,(eventenemy) ;enemy type to place (lvl)
+ ld hl,enemy00 ;enemy 1 specs
+ add a,a ;a=type*2
+ add a,a ;a=type*4
+ ld c,a ;c=type
+ ld b,0 ;bc = enemy nr.
+ add hl,bc ;hl = enemy specs
+ ld a,(hl) ;load hitpoints+occ of this enemy class
+ ld (de),a ;occ
+
+ inc hl ;next enemyInfo byte
+ inc de ;next byte of current enemy
+ ld a,(hl) ;load movement+type of this enemy class
+ ld (de),a ;enemy type
+
+ inc de ;set x-pos
+ ld a,122 ;appear at right edge of screen (128-6)
+ ld (de),a ;= x-position
+
+ inc de ;set y-pos
+ inc hl ;where to place??
+ ld a,(hl) ;load placeInfo
+ 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:
+ call Random ;make a (in a) random value 0-255
+ cp 51 ;y may not be more than 51
+ jr c,ypos_OK ;OK if a<51
+ and %00111111 ;a = 0..63
+ sub 13 ;a = -13..50
+ jr c,random_enemy ;not OK if a<0
+
+ypos_OK: ;random value successfully created
+ ld (de),a ;save y-position
+
+ ld hl,add2enemy-3 ;offset to xtra enemy info
+ add hl,de ;hl points to <xtra info: move>
+ ld (hl),1 ;set move-counter to 1
+ inc hl ;hl to <xtra info: fire>
+ ld (hl),1 ;set time-to-fire to 1 frame (fires directly)
+ ret ;return
+
+Random:
+ ld a,(RanPos) ;a handy random-var.
+ ld hl,x ;add your x-coord for randomness
+ adc a,(hl)
+ ld hl,y ;add your y-coord for randomness
+ adc a,(hl)
+ ld (RanPos),a ;save altered random-var
+ ret ;RanPos also in #a
+
+;--------------------------- enemy fires --------------------------------------
+
+Enemy_fires: ;de = x,y
+ dec d
+ dec d ;d = x-2
+ inc e ;e = y+1
+
+ ld b,10
+ ld hl,ebullets
+find_ebullet:
ld a,(hl)
- ld (de),a
+ or a
+ jr z,found_ebullet ;0 = not used
+ inc hl \ inc hl \ inc hl
+ djnz find_ebullet ;look next bullet
+ ret
+found_ebullet:
+ ld (hl),1 ;use bullet &&&
inc hl
- ld (curevent),hl
- ld a,(hl)
- ld (nextevent),a
+ ld (hl),d ;set x-pos
+ inc hl
+ ld (hl),e ;set y-pos
+ ret
+
+;----------------------------- enemy bullets ----------------------------------
+
+Enemy_bullets:
+ ld hl,ebullets
+ ld b,10
+handle_bullet:
+ push bc
+ push hl
+ ld a,(hl) ;load bulletType in a
+ or a ;is it 0?
+ jr nz,enemy_bullet ;no: handle bullet
+next_bullet:
+ pop hl ;do not move the <pop hl>
+ pop bc
+ inc hl \ inc hl \ inc hl
+ djnz handle_bullet
ret
+enemy_bullet:
+ ld b,a ;save type
+ inc hl ;bullet x
+ ld a,(hl) ;check if it has reached the left side of scrn
+ and %11111110 ;it is <2 (0 or 1)?
+ jr z,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
+ dec a ;type 1?
+ jr z,ebullet_common ;normal bullet
+
+ebullet_down:
+ ld a,(timer)
+ rra
+ jr c,ebullet_common
+ inc (hl)
+
+ebullet_common:
+ ld e,(hl) ;e=y
+ ld ix,spr_bullet11 ;display enemy bullet
+ call putsprite
+
+ebullet_hits:
+ ld a,(your_occ)
+ or a
+ jr nz,next_bullet ;0 = you're normal
+
+ pop hl
+ push 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
+
+ call 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 b,nrenemies ;handle all enemies
handle_enemy:
+ push bc
push hl
- ld d,(hl)
- inc hl
- ld e,(hl)
- ld a,d
- or a
- jr z,next_enemy
+ ld a,(hl)
+ and %00000011
+ jr z,next_enemy ;occ "no enemy" 0
dec a
+ jr z,exploding_enemy ;occ "exploding" 1
+ ld b,a ;b=2 if moving, otherwise b=1
+
+normal_enemy: ;occ "normal" 2 or "moving" 3
+ inc hl
+ push hl
+
+ ld e,(hl) ;e = enemy type
+ ld d,0 ;de = e
+ ld hl,sprites ;hl = @sprites offset-table
+ add hl,de ;points to offset of current enemy offset
+ ld e,(hl) ;de = @enemy offset
+
+ ld ix,spr_enemy00 ;first enemy sprite
+ add ix,de ;add offset for current enemy
+ pop hl
+
+ inc hl
+ ld a,(hl) ;x
+ dec a ;move left
+ jr c,remove_enemy ;off screen
+ jr z,remove_enemy ;"
ld d,a
- jr z,remove_enemy
- ld (hl),e
- dec hl
- ld (hl),d
- ld ix,spr_enemy01
- call drw_spr
- jr next_enemy
+ inc hl
+ ld e,(hl) ;y
+ ld a,b ;moving state was stored in b earlier
+ dec a ;is it 1?
+ call nz,moving_enemy ;2 = moving enemy
+
+ymove_done:
+ dec hl ;@x
+ ld (hl),d ;store new x
+
+ push hl
+ push de ;save registers for firing-use
+ call putsprite ;display sprite @ix
+ pop de ;restore (destroyed by putsprite)
+ pop hl
+
+check_enemyfire:
+ ld bc,add2enemy+1-2 ;offset of <xtra enemy info: fire>
+ add hl,bc ;go there (@hl)
+ dec (hl) ;decrease counter till next blast
+ ld a,(hl) ;load new counter
+ or a ;has it reached zero?
+ jr nz,next_enemy ;finished if not
+
+ add a,64 ;re-set counter for next blast
+ ld (hl),a ;save
+ call Enemy_fires ;fires bullet
+
+next_enemy:
+ pop hl
+ ld bc,$0004
+ add hl,bc
+ pop bc
+ djnz handle_enemy
+ ret
remove_enemy:
+ pop hl
+ ld (hl),$0000 ;bye bye enemy
+ push hl
+ jr next_enemy
+
+exploding_enemy:
+ inc hl
+ push hl
+ ld a,(hl)
+ call explosion_stuff ;display explosion
+ pop hl
+
+ ld a,(hl)
+ cp 15
+ jr z,remove_enemy ;remove when at last frame
+ inc a
+ ld (hl),a ;next frame
+ jr next_enemy
+
+;--------------------------- moving enemies -----------------------------------
+
+moving_enemy:
+movetype_updown: ;&&&
+ ld bc,add2enemy
+ add hl,bc
+
+ ld a,(hl)
+ dec a
+ jr nz,move_updated
+ add a,128
+move_updated:
+ ld (hl),a
+
+ or a ;reset carry flag
+ sbc hl,bc
+ and %00100000
+ jr z,movedown
+
+moveup:
+ ld a,(hl) ;load y-position
+ dec a ;decrease y-pos (=move up)
+ ret m ;don't move off the screen (y<0)
+ ld (hl),a ;save new y-pos
+ ret ;finish
+movedown:
+ ld a,(hl) ;load current y
+ inc a ;increase y-pos
+ cp 55 ;compare with bottom
+ ret nc ;return if it has passed that line (>40)
+ ld (hl),a ;otherwise save new position
+ ret ;and return
+
+;--------------------------- check collision ----------------------------------
+
+Enemies_hit:
+ ld a,(your_occ)
+ or a ;0 = you're normal
+ ret nz
+
+ ld de,(x) ;e = X, d = Y
+ ld hl,enemies
+ ld b,nrenemies ;check all 20 enemies
+check_collision:
+ push hl
+ ld a,(hl)
+ and %00000010
+ jr z,check_next ;2 or 3 = ok
+ inc hl
+
+collide_enemy:
+; push hl
+; push bc
+; ld hl,enemy00 ;enemy 1 specs
+; add a,a ;a=type*2
+; add a,a ;a=type*4
+; ld c,a ;c=type
+; ld b,0 ;bc = 4 * enemy nr.
+; add hl,bc ;hl = enemy specs
+; ld a,(hl) ;load size byte
+; pop bc
+; pop hl
+; ld c,a ;save size in c
+
+ inc hl
+ ld a,(hl) ;check x match
+ sub e ;enemy position minus yours
+ add a,6
+ jp m,check_next
+ cp 12
+ jr nc,check_next
+
+ inc hl
+ ld a,(hl) ;check y match
+ sub d ;same as with x-check
+ add a,6
+ jp m,check_next
+ cp 12
+ jr nc,check_next
+ dec hl
dec hl
- ld (hl),$0000
-next_enemy:
+take_pickup:
+ ld a,(hl) ;load enemy type
+ or a
+ jr nz,collide ;enemy when <>0
+
+ ld a,(your_armor)
+ inc a
+ ld (your_armor),a
+
+ dec hl ;to enemy occ
+ xor a ;set to 0 = gone
+ ld (hl),a ;remove
+ jr check_next ;all done, next..
+
+collide:
+ xor a
+ ld (hl),a ;explosionFrame 0
+ dec hl
+ inc a
+ ld (hl),a ;set to explode
+ call damage_you ;auch!
+
+check_next:
pop hl
inc hl
inc hl
- ld a,(hl)
- cp $ff
- jr nz,handle_enemy
-
+ inc hl
+ inc hl
+ djnz check_collision
ret
+;--------------------------- game over ----------------------------------------
+
+game_over:
+ call _clrLCD ;clear screen
+ ld hl,$0603
+ ld (_curRow),hl ;center
+ ld hl,txt_gameover
+ call _puts ;display "GAME OVER"
+
+ ld hl,lives
+ dec (hl) ;decrease lives
+
+ ld b,$20
+wait2: halt \ halt
+ djnz wait2 ;delay
+ call _getkey ;wait for keypress
+
+;--------------------------- new game -----------------------------------------
+
+New_level:
+ xor a ;a=0
+ ld a,3
+ ld (your_armor),a ;no armor
+ xor a
+ ld hl,x ;begin position x=...
+ ld (hl),a ;...=a=0=left
+ inc hl ;y=...
+ ld (hl),24 ;...=24=middle
+ ld (level),a ;reset level nr
+ ld (score),a ;reset score
+ ld hl,level01-3 ;set level pointer to level#1
+ ld (levelp),hl ;reset level pointer
+
+;--------------------------- next level ---------------------------------------
+
+Next_level:
+ ld hl,level
+ inc (hl) ;increase level nr.
+ ld a,80
+ ld (nextevent),a ;time to first enemy appearance
+
+ ld hl,(levelp) ;level pointer
+ inc hl
+ inc hl
+ inc hl ;update to point to next level
+ ld (levelp),hl ;save
+
+ ld a,(hl) ;load new level-enemy type
+ ld (eventenemy),a ;set level-enemy
+ inc hl
+ ld a,(hl) ;load new appearance-time
+ ld (eventtime),a ;set
+ inc hl
+ ld a,(hl) ;load nr of enemies in this level
+ ld (eventleft),a ;set nr of events left
+
+ xor a
+ ld (timer),a ;reset time
+ ld hl,your_occ ;hl = your_occ
+ ld (hl),a ;reset your ship (not exploding)
+ inc hl ;hl = your_inv
+ ld (hl),50 ;set 50 frames invulnerable
+
+;--------------------------- setup game ---------------------------------------
+
+game_setup:
+ call _clrLCD ;clear screen
+ ld a,%10111011
+ ld hl,VIDEO_MEM ;screen location (top left)
+ ld b,0 ;b = 0 (loop 0-1 = 0FFh = 256 times)
+clearloop2:
+ inc a
+ ld (hl),a ;clear four times (total = 256*4 = 1024 bytes)
+ inc hl
+ ld (hl),a
+ inc hl
+ xor $ff
+ ld (hl),a
+ inc hl
+ ld (hl),a
+ inc hl
+ xor $ff
+ djnz clearloop2 ;repeat 256x
+
+ ld hl,$0703
+ ld (_curRow),hl ;center
+ ld hl,txt_level
+ call _puts ;display "LEVEL "
+
+ ld a,(level)
+ ld l,a
+ ld h,$00
+
+ call UNPACK_HL
+ add a,'0'
+ ld b,a
+ call UNPACK_HL
+ add a,'0'
+ call _putc ;display second digit
+ ld a,b
+ call _putmap ;display first digit
+
+ ld hl,$0904
+ ld (_curRow),hl ;display lives left below level nr
+ ld hl,txt_lives ;bar text: "Lx0"...
+ ld a,(lives) ;lives left
+ add a,'0' ;make value
+ ld (txt_lives+3),a ;add to text
+ call _puts ;display the string
+
+ ld b,$20
+wait: halt \ halt
+ djnz wait ;delay
+ call _getkey ;wait for keypress
+
+ ld ix,spr_icon00 ;empty icon
+ ld de,$1a01 ;icon #1
+ call putwidesprite ;display
+ ld ix,spr_icon00 ;emptyIcon
+ ld de,$2a01 ;icon #2
+ call putwidesprite
+; ld ix,spr_icon02 ;emptyIcon
+; ld de,$3a01 ;icon #3
+; call putwidesprite
+ ld ix,spr_icon00 ;emptyIcon
+ ld de,$4a01 ;icon #4
+ call putwidesprite
+ ld ix,spr_icon00 ;emptyIcon
+ ld de,$5a01 ;icon #5
+ call putwidesprite
+
+ ld ix,spr_icon02 ;armorIcon
+ ld de,$3a01 ;bottom mid
+ call putwidesprite ;display
+
+ ld hl,GRAPH_MEM ;from storage (top left)
+ ld de,VIDEO_MEM+(56*16);to screen (top left)
+ ld a,8 ;display height = 64 bytes (minus 8 for bar)
+displayloop3:
+ ld bc,16 ;display width = 16 bytes (16*8bits=256pixels)
+ ldir ;16x de >> hl
+ dec a ;next line
+ jr nz,displayloop3 ;loop 8x
+
+ ld hl,$3900 ;display Lives
+ ld (_penCol),hl ;bottom left
+ ld hl,savestr+2
+ ld (hl),'L'
+ inc hl
+ ld (hl),'x'
+ inc hl
+
+ ld a,(lives) ;nr of lives in a
+ add a,'0' ;make digit
+ ld (hl),a
+ dec hl \ dec hl
+ call _vputs ;display on screen
+
+ ld hl,VIDEO_MEM+(16*56);56 rows down = eight rows from bottom
+ ld b,16 ;draw 16x (screen width)
+drawline:
+ ld a,%11111111 ;horizontal line mask
+ ld (hl),a ;draw one piece of the divider-line
+ inc hl ;move right (8 pixels = 1 byte)
+ djnz drawline ;repeat (16bytes * 8pixels =128= screen width)
+ ret
+
;--------------------------- putsprite ----------------------------------------
+;--------------------------- de =(X,Y) ----------------------------------------
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
+ .db 128,64,32,%10000,%01000,%00100,%00010,%00001
+putsprite:
+ ld a,d ;a = X
+ and %00000111 ;a = X mod 8 = bit nr. to mask
+ ld hl,offsets_table ;pixel mask table
+ ld c,a ;bit nr.
+ ld b,0 ;word
+ add hl,bc ;add to table
+ ld a,(hl) ;a = pixel mask
+ ld (_smc1+1),a ;alter pixel mask
+
+ ld hl,GRAPH_MEM ;save-location
+ ld a,e ;y-coord
+ 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)
+ srl d ;d/2
+ srl d ;d/4
+ srl d ;d/8 (8 bits in byte) ** c is set when overflow
+ add a,d ;a = (Y*16+X/8) mod 256
+ jr nc,_n1 ;jump if no carry = no overflow = a<=255
+ inc b ;a>255 so increase bc by 256
+_n1: ld c,a ;c = (Y*16+X/8) mod 256
+ add hl,bc ;bc = Y*16+X/8
- ld d,(ix)
- ld b,(ix+1)
-_oloop: push bc ;Save # of rows
- push hl ;Save screen address
- 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
+ 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,16 ;Go to next line
+ add hl,bc
+ pop bc ;Restore data
+ djnz _oloop
ret
+;--------------------------- putbigsprite -------------------------------------
+putwidesprite:
+ ld a,d
+ and 7
+ ld hl,offsets_table
+ ld c,a
+ ld b,0
+ add hl,bc
+ ld a,(hl)
+ ld (wsmc1+1),a
+ ld (wsmc2+1),a
+
+ ld hl,GRAPH_MEM
+
+ ld a,e
+ add a,a
+ add a,a
+ add a,a
+
+ rl b
+ add a,a
+ rl b
+ srl d
+ srl d
+ srl d
+ add a,d
+ jr nc,n1
+ inc b
+n1: ld c,a
+ add hl,bc
+
+ ld d,(ix)
+ ld b,(ix+1)
+woloop: push bc ;Save # of rows
+ push hl ;Save screen address
+ ld b,d ;Load width
+ ld c,(ix+2) ;Load one line of image
+ inc ix
+wsmc1: ld a,1 ;Load pixel mask
+wiloop: sla c ;Test leftmost pixel
+ jr nc,wnoplot ;See if a plot is needed
+ ld e,a ;OR pixel with screen
+ or (hl)
+ ld (hl),a
+ ld a,e
+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,16 ;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,16
+ add hl,bc
+ pop bc
+ djnz woloop
+ ret
-
+;------------------------------------------------------------------------------
;------------------------------- sprites --------------------------------------
+;------------------------------------------------------------------------------
spr_ship:
- .db 7,7
- .db %11111000
- .db %11000000
- .db %11111100
- .db %11111110
- .db %11111100
- .db %11000000
- .db %11111000
+ .db 9,1 ;ship icon
+ .db %11100000 ; ███
+ .db %01111000 ; ████
+ .db %00111110 ; █████
+ .db %01111001 ; ████ █
+ .db %01111001 ; ████ █
+ .db %01111001 ; ████ █
+ .db %00111110 ; █████
+ .db %01111000 ; ████
+ .db %11100000 ; ███
+
+spr_ship01:
+ .db 7,7 ;ship alpha class
+ .db %01111000 ; ████
+ .db %11100000 ; ███
+ .db %11111100 ; ██████
+ .db %11110010 ; ████ █
+ .db %11111100 ; ██████
+ .db %11100000 ; ███
+ .db %01111000 ; ████
+spr_ship01i:
+ .db 7,7 ;ship alpha class
+ .db %01010000 ; █ █
+ .db %10100000 ; █ █
+ .db %01010100 ; █ █ █
+ .db %10100010 ; █ █ █
+ .db %01010100 ; █ █ █
+ .db %10100000 ; █ █
+ .db %01010000 ; █ █
+
+spr_ship02:
+ .db 7,7 ;ship beta class
+ .db %11000000 ; ██
+ .db %11110000 ; ████
+ .db %01111100 ; █████
+ .db %01110010 ; ███ █
+ .db %01111100 ; █████
+ .db %11110000 ; ████
+ .db %11000000 ; ██
spr_bullet01:
- .db 3,5
- .db %01000000
- .db %11100000
- .db %11100000
- .db %11100000
- .db %11100000
-
+ .db 5,3 ;your bullets
+ .db %00110000 ; ░▒▓█▒
+ .db %11111000 ; ░▒▓████▒
+ .db %00110000 ; ░▒▓█▒
spr_bullet02:
- .db 3,3
- .db %01000000
- .db %11100000
- .db %01000000
+ .db 5,3
+ .db %11110000 ; ░▒▓███▒
+ .db %11111000 ; ░▒▓████▒
+ .db %11110000 ; ░▒▓███▒
-spr_enemy01:
- .db 6,6
- .db %00111100
- .db %01110000
- .db %11110000
- .db %11110000
- .db %01110000
- .db %00111100
+spr_bullet11:
+ .db 3,3 ;enemy bullets
+ .db %01000000 ; ▒▓▒░
+ .db %11100000 ; ▒██▓▒░
+ .db %01000000 ; ▒▓▒░
+
+;---------------------------------------- explosion -------------------------------------------
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 --------------------------------------
+ .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 ; █▒ █
+
+;--------------------------------------- bar -----------------------------------
+
+spr_icon00:
+ .db 16,7 ;unused .......:.......:
+ .db %10101010,%10101010 ; █ █ █ █ █ █ █ █
+ .db %11010101,%01010101 ; ██ █ █ █ █ █ █ █
+ .db %10101010,%10101010 ; █ █ █ █ █ █ █ █
+ .db %11010101,%01010101 ; ██ █ █ █ █ █ █ █
+ .db %10101010,%10101010 ; █ █ █ █ █ █ █ █
+ .db %11010101,%01010101 ; ██ █ █ █ █ █ █ █
+ .db %10101010,%10101010 ; █ █ █ █ █ █ █ █
+spr_icon01:
+ .db 16,7 ;invulnerable....:.......:
+ .db %10000000,%01010100 ; █ O O O
+ .db %10011110,%00101010 ; █ OOOO O O O
+ .db %10111000,%00010101 ; █ OOO O O O
+ .db %10111111,%10101010 ; █ OOOOOOO O O O
+ .db %10111111,%00010101 ; █ OOOOOOO O O O
+ .db %10111000,%00101010 ; █ OOO O O O
+ .db %10011110,%01010100 ; █ OOOO O O O
+spr_icon02:
+ .db 16,7 ;armor ; .......:.......:
+ .db %10001111,%10000000 ; █ █████
+ .db %10010000,%01000100 ; █ █ █ XXX
+ .db %10101110,%00101010 ; █ █ ███ █ XXX
+ .db %10100111,%10101010 ; █ █ ████ █ XXX
+ .db %10101110,%00101010 ; █ █ ███ █ XXX
+ .db %10010000,%01000100 ; █ █ █ XXX
+ .db %10001111,%10000000 ; █ █████
+
+;---------------------------- texts -------------------------------------------
+
+txt_about: .db "v0.8.93 ","by Shiar "
+ .db "(ICQ#43840958)",0
+txt_1player: .db "1 PLAYER",0
+txt_2players: .db "2 PLAYERS",0
+txt_level: .db "LEVEL ",0
+txt_gameover: .db "GAME OVER!",0
+txt_lives: .db "Lx0?",0
+
+;---------------------------- save data ---------------------------------------
stored_data_start:
-curevent .dw Leveldata ;next event
-nextevent .db (Leveldata) ;time to next event
+timer .db $00 ;frame counter
+level .db $00 ;level number
+levelp .dw level01 ;pointer to level data
+
+eventenemy .db $02 ;enemy type
+eventtime .db $15 ;enemy frequency
+eventleft .db $00 ;nr. of enemies still to come
+nextevent .db $50 ;time to next event
+
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:
+your_occ .db $00 ;0=normal 1..16=exploding
+your_inv .db $50 ;invincibility left
+your_armor .db $13 ;HP left
+lives .db $03 ;
+x .db $16 ;x-pos
+y .db $46 ;think about it..
+hp .db $00 ;hitpoints left
+
+ybullets .dw 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ;10 x (state,x,y)
+ebullets .dw 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ;10 x (state,x,y)
+
+nrenemies = 10
+enemies .dw $0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000
+ .dw $0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000
+ .dw $0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000
+ .dw $0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000
+
+enemiesxtra .dw $0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000
+ .dw $0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000
+ .dw $0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000
+ .dw $0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000,$0000
+add2enemy = 40
+
+; %111111 (HP left) 11 (00=no enemy 01=exploding 10=normal 11=moving)
+; %11111111 (ship type or explosion frame) %11111111 (x) %11111111 (y)
+
+;---------------------------- enemy data --------------------------------------
+
+sprites:
+ .db $00
+ .db spr_enemy01-spr_enemy00
+ .db spr_enemy02-spr_enemy00
+ .db spr_enemy03-spr_enemy00
+ .db spr_enemy04-spr_enemy00
+ .db spr_enemy05-spr_enemy00
+ .db spr_enemy06-spr_enemy00
+ .db spr_enemy07-spr_enemy00
+
+spr_enemy00:
+ .db 6,5 ;pickup
+ .db %11111100 ; ██████
+ .db %10010100 ; █ █ █
+ .db %11111100 ; ██████
+ .db %10010100 ; █ █ █
+ .db %11111100 ; ██████
+spr_enemy01:
+ .db 6,6 ;enemy type one
+ .db %00111100 ; ████
+ .db %01110000 ; ███
+ .db %11110000 ; ████
+ .db %11110000 ; ████
+ .db %01110000 ; ███
+ .db %00111100 ; ████
+spr_enemy02:
+ .db 8,6 ;enemy type two
+ .db %00111111 ; █████
+ .db %01111000 ; ████
+ .db %11111100 ; ██████
+ .db %11111100 ; ██████
+ .db %01111000 ; ████
+ .db %00111111 ; █████
+spr_enemy03:
+ .db 6,6 ;enemy type three
+ .db %01111100 ; █████
+ .db %11110000 ; ████
+ .db %11111000 ; █████
+ .db %11111000 ; █████
+ .db %11110000 ; ████
+ .db %01111100 ; █████
+spr_enemy04:
+ .db 6,6 ;enemy type four
+ .db %00111000 ; ███
+ .db %01111100 ; █████
+ .db %11111000 ; █████
+ .db %11111000 ; █████
+ .db %01111100 ; █████
+ .db %00111000 ; ███
+spr_enemy05:
+ .db 7,6 ;enemy type four
+ .db %00011110 ; ████
+ .db %01111110 ; ██████
+ .db %11111100 ; ██████
+ .db %11111100 ; ██████
+ .db %01111110 ; ██████
+ .db %00011110 ; ████
+spr_enemy06:
+ .db 7,6 ;enemy type four
+ .db %00011100 ; ███
+ .db %01111110 ; ██████
+ .db %10111000 ; █ ███
+ .db %10111000 ; █ ███
+ .db %01111110 ; ██████
+ .db %00011100 ; ███
+spr_enemy07:
+ .db 8,6 ;enemy type four
+ .db %00011110 ; ████
+ .db %01111111 ; ███████
+enemy00:.db %10011100 ; █ ███
+ .db %10011100 ; █ ███
+ .db %01111111 ; ███████
+ .db %00011110 ; ████
+
+ ;enemyInfo: %000000:HP %10:occ $00:type $00:app $00:unused
+enemy01: ;#1 HP:1 app:random
+ .db %00000010,1,1,0
+enemy02: ;#2 HP:1 app:halflure
+ .db %00000010,2,3,0
+enemy03: ;#3 HP:1 app:random moving
+ .db %00000011,3,1,0
+enemy04: ;#4 HP:2 app:lure
+ .db %00000110,4,2,0
+enemy05: ;#5 HP:2 app:random moving
+ .db %00000111,5,1,0
+enemy06: ;#6 HP:2 app:lure moving
+ .db %00000111,6,2,0
+enemy07: ;#7 HP:4 app:halflure moving
+ .db %00001111,7,3,0
+
+;----------------------------- level info -------------------------------------
+
+level01:
+ .db $01,$1b,$2f ;enemy nr ; enemy frequency ; next lvl
+level02: ;frequency must be odd if halfluring!
+ .db $02,$11,$4b
+level03:
+ .db $03,$1d,$3f
+level04:
+ .db $04,$0d,$4f
+level05:
+ .db $05,$2d,$3d
+level06:
+ .db $06,$2b,$39
+level07:
+ .db $07,$25,$f9
+
+;----------------------------- logo -------------------------------------------
+
+logo_nemesis:
+.db %11111111,%11111111,%11111111,%11111110,%11111111,%11110111,%11111111,%11111110,%11111111,%111101111,%11111111,%00001011,%11111111,%11111111,%11111111,%11111000
+.db %01111111,%11111111,%11111111,%11111110,%11111111,%11110111,%11111111,%11111110,%11111111,%111101111,%11111111,%00011011,%11111111,%11111111,%11111111,%11110000
+.db %00111111,%11111111,%11111111,%11111110,%11111111,%11110111,%11111111,%11111110,%11111111,%111101111,%11111111,%00111011,%11111111,%11111111,%11111111,%11100000
+.db %00011111,%11111111,%11111111,%11111110,%11111111,%11110111,%11111111,%11111110,%11111111,%111101111,%11111111,%01111011,%11111111,%11111111,%11111111,%11000000
+.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 ----------------------------
+;Game · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · NEMESIS
+;Version · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 0.8.93
+;Latest modification · · · · · · · · · · · · · · · · · · · · · · · · · 3.IX.99
+;Calc · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · TI-86 only
+;Size · · · · · · · · · · · · · · · · · · · · · · · · · · · 2417 bytes on calc
+;Author · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · SHIAR
+;ICQ · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · #43840958
+;E-mail · · · · · · · · · · · · · · · · · · · · · · · · · · shiar0@hotmail.com
+;Homepage · · · · · · · · · · · · · · · · · · coming soon (www.wish.net/~shiar)
-;NEMESIS'86 by Shiar
+;Notes:
+; <*> This game is not yet finished (BETA) and there may still be some bugs.
+; <*> Source will be released when the game has been finished.
+; <*> Have fun, and have even more fun with the completed version of NEMESIS!
+;----------------------------- version history --------------------------------
-;0.01.717 -- 17.VII.99 -- size 984
+;0.01.717 -- 17.VII.99 -- size 909
;
-; + movement of ship over whole screen
+; + used "Galaxian"-game engine (drawings, movement, enemy-routines)
+; + movement of ship over 3/4 screen (96 pixels; 32 pixels for score)
; + enemies moving from right to left, appearing right at specified times
+;
+; 0.1.718 -- 18.VII.99 -- size 832
+;
+; # no crash when level restarts for the third time
+; * exit-procedure updated, unnecessary stuff/keychecks removed
+; - alot of unused code removed
+; + different types of enemies (just look different)
+; + collision detection!! enemy ships disappear when you hit them
+;
+; 0.2.718 -- 18.VII.99 -- size 1078
+;
+; + ability to fire bullets (F1). Enemies disappear on impact
+; * enemies explode instead of disappearing
+;
+; 0.3.719 -- 19.VII.99 -- size 1326
+;
+; * bullets appear correctly (not INSIDE your ship)
+; + some enemies can take multiple hits (differs per class)
+; + all enemies fire bullets at random
+; + if you're hit by bullet/enemy, you'll lose one hitpoint
+;
+; 0.4.720 -- 20.VII.99 -- size 1406
+;
+; # collision detection fixed and optimized (much faster now!)
+; + shell-icon added (YAS type)
+; * code optimizations, some data "compression"
+; * explosion looks better, and some vars removed/smaller
+; # enemies are removed when at left side (instead of becoming invisible)
+; + displays level number before each level begins
+;
+; 0.5.725 -- 25.VII.99 -- size 1703
+;
+; * waits a sec at level display (in case of accidental keypress)
+; * moving enemies (move up+down)
+; # bullets removed correctly so they can be used again later
+; * first level made
+; # enemy weaponfire is fired from correct positions
+; + your ship explodes on impact with ships/bullets
+; * game over screen will be displayed just *after* your ship's gone
+; + frame counter onscreen
+;
+; 0.6.820 -- 20.IIX.99 -- size 2077
+;
+; * play field increased to full screen instead of 3/4
+; + bottom eight lines used for score (etc) display
+; - no more solid levels, enemies are placed at random
+; + enemies appear every x turns (depends on level)
+; # fixed bullets so they don't disappear at 3/4 of the screen
+; * A LOT of optimizations both in speed and size!!
+; + enemy type, frequency, and number specified per level
+; + bottom score bar displays score, lives and icons (to be used later)
+; * smarter enemy handling (so enemies have different sizes)
+; + bottom bar divided from playing field by a horizontal line
+; + five levels (and five enemies) made
+; # game vars reset at start and game over
+; + NEMESIS LOGO displayed at startup!! (also, program grew 350bytes ):
+; + version/credits string displayed below logo: v0.6.820 by shiar (ICQ#)
+;
+; 0.6.825 -- 25.IIX.99 -- size 2085
+;
+; # pointer to fifth ship corrected (ships in level 5 weren't displayed)
+; # calc doesn't crash anymore when game is continued after game over!!
+; + lives are decreased when ship is destroyed
+; # last eight pixels of divider line are shown correctly now
+;
+; 0.7.92 -- 02.IX .99 -- size 2303
+;
+; + contrast is increased one level at startup (and restored on exit)
+; + invulnerable for a sec when you enter the game (inv-pickup later)
+; + when in invulnerable-mode, your ship look different!
+; + at the beginning you get three *hitpoints* so you can be hit 3 times
+; * bottomline icons are now 16 pixels wide and 7 pixels high!
+; + hitpoint icon added: displays nr. of hps left next to a nice picture
+; * maximum invulnerability-time is increased (can last upto 1024 frames)
+; + when invulnerable-mode has nearly expired, your ship flashes!
+; * again a lot of optimizations esp. in size ('bout 100 bytes)
+; + pickups! 10% chance a destroyed enemy changes into an armor-pickup
+; # code optimization caused some bullets to reappear as "fake" bullets
+; * pickups can't be destroyed by bullets (they pass right through it)
+;
+; 0.8.93 -- 03.IX .99 -- size 2433
+;
+; + enemies move individually, not all at the same time!! Looks very nice
+; # titlescreen background is cleared (looked weird in Rascall and TI-OS)
+; + enemies fire at a ### rate instead of firing at will (too random)
+; # moving enemies don't move off the screen top/bottom (they wait there)
+; + seven playable levels going easy to hard (including moving enemies)
+; # xtraInfo data wasn't reset when a moving enemy entered the game
+; * longer delay when level is completed (NextLevel screen came too soon)
+;To FIX: pickups fire bullets!?!
-
+; + added - removed * changed # bug fixed
git.shiar.nl / nemesis.git / blobdiff