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invader_16.bas.asm
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; Provided under the CC0 license. See the included LICENSE.txt for details.
processor 6502
include "vcs.h"
include "macro.h"
include "multisprite.h"
include "2600basic_variable_redefs.h"
ifconst bankswitch
if bankswitch == 8
ORG $1000
RORG $D000
endif
if bankswitch == 16
ORG $1000
RORG $9000
endif
if bankswitch == 32
ORG $1000
RORG $1000
endif
if bankswitch == 64
ORG $1000
RORG $1000
endif
else
ORG $F000
endif
ifconst bankswitch_hotspot
if bankswitch_hotspot = $083F ; 0840 bankswitching hotspot
.byte 234 ; stop unexpected bankswitches
endif
endif
game
.
;
.
;
.
;
.
;
.
;
.
;
.
;
.L00 ; includesfile multisprite_bankswitch.inc
.L01 ; set kernel_options no_blank_lines
.
;
.L02 ; set kernel multisprite
.L03 ; set romsize 8k
.
;
.
;
.
;
.L04 ; scorecolor = 14
LDA #14
STA scorecolor
.
;
.L05 ; dim _sc3 = score + 2
.
;
.
;
.L06 ; dim inv_x = a : a = 84
LDA #84
STA a
.L07 ; dim inv_y = b : b = 76
LDA #76
STA b
.L08 ; dim inv_delay = c : c = 0
LDA #0
STA c
.L09 ; dim inv_dir = f : f = 1
LDA #1
STA f
.L010 ; dim inv_shot_x = g : g = 0
LDA #0
STA g
.L011 ; dim inv_shot_y = h : h = 0
LDA #0
STA h
.L012 ; dim inv_fire_delay = k : k = 0
LDA #0
STA k
.L013 ; dim inv_fired = l : l = 0
LDA #0
STA l
.L014 ; dim inv_hit = n : n = 0
LDA #0
STA n
.L015 ; dim inv_blast_delay = o : o = 0
LDA #0
STA o
.
;
.
;
.L016 ; dim tur_x = d : d = 84
LDA #84
STA d
.L017 ; dim tur_y = e : e = 14
LDA #14
STA e
.L018 ; dim shot_x = i : i = tur_x
LDA tur_x
STA i
.L019 ; dim shot_y = j : j = tur_y
LDA tur_y
STA j
.L020 ; dim tur_fired = m : m = 0
LDA #0
STA m
.
;
.
;
.
;
.main
; main
.
;
.L021 ; gosub draw__move_turret
jsr .draw__move_turret
.L022 ; gosub draw__move_turret_shot
jsr .draw__move_turret_shot
.L023 ; gosub draw__move_invader
jsr .draw__move_invader
.L024 ; gosub draw__move_inv_shot
jsr .draw__move_inv_shot
.L025 ; gosub col_shot_inv
jsr .col_shot_inv
.
;
.L026 ; if _sc3 >= 70 then goto game_over
LDA _sc3
CMP #70
BCC .skipL026
.condpart0
jmp .game_over
.skipL026
.
;
.L027 ; drawscreen
sta temp7
lda #>(ret_point1-1)
pha
lda #<(ret_point1-1)
pha
lda #>(drawscreen-1)
pha
lda #<(drawscreen-1)
pha
lda temp7
pha
txa
pha
ldx #2
jmp BS_jsr
ret_point1
.
;
.L028 ; goto main
jmp .main
.
;
.
;
.
;
.
;
.
;
.
;
.
;
.draw__move_invader
; draw__move_invader
.
;
.L029 ; inv_delay = inv_delay + 1
INC inv_delay
.
;
.
;
.L030 ; if inv_delay = 15 && inv_hit = 0 then player0:
LDA inv_delay
CMP #15
BNE .skipL030
.condpart1
LDA inv_hit
CMP #0
BNE .skip1then
.condpart2
LDX #<player2then_0
STX player0pointerlo
LDA #>player2then_0
STA player0pointerhi
LDA #9
STA player0height
.skip1then
.skipL030
.
;
.
;
.L031 ; if inv_delay = 30 && inv_hit = 0 then player0:
LDA inv_delay
CMP #30
BNE .skipL031
.condpart3
LDA inv_hit
CMP #0
BNE .skip3then
.condpart4
LDX #<player4then_0
STX player0pointerlo
LDA #>player4then_0
STA player0pointerhi
LDA #9
STA player0height
.skip3then
.skipL031
.
;
.L032 ; if inv_delay > 30 then inv_delay = 0
LDA #30
CMP inv_delay
BCS .skipL032
.condpart5
LDA #0
STA inv_delay
.skipL032
.
;
.
;
.L033 ; COLUP0 = 52
LDA #52
STA COLUP0
.
;
.
;
.L034 ; if inv_hit = 0 && inv_dir = 1 && inv_delay = 15 then inv_x = inv_x + 1
LDA inv_hit
CMP #0
BNE .skipL034
.condpart6
LDA inv_dir
CMP #1
BNE .skip6then
.condpart7
LDA inv_delay
CMP #15
BNE .skip7then
.condpart8
INC inv_x
.skip7then
.skip6then
.skipL034
.L035 ; if inv_hit = 0 && inv_dir = 1 && inv_delay = 30 then inv_x = inv_x + 1
LDA inv_hit
CMP #0
BNE .skipL035
.condpart9
LDA inv_dir
CMP #1
BNE .skip9then
.condpart10
LDA inv_delay
CMP #30
BNE .skip10then
.condpart11
INC inv_x
.skip10then
.skip9then
.skipL035
.
;
.L036 ; if inv_x > 143 then inv_dir = 0 : inv_x = 143 : inv_y = inv_y - 5
LDA #143
CMP inv_x
BCS .skipL036
.condpart12
LDA #0
STA inv_dir
LDA #143
STA inv_x
LDA inv_y
SEC
SBC #5
STA inv_y
.skipL036
.
;
.
;
.L037 ; if inv_hit = 0 && inv_dir = 0 && inv_delay = 15 then inv_x = inv_x - 1
LDA inv_hit
CMP #0
BNE .skipL037
.condpart13
LDA inv_dir
CMP #0
BNE .skip13then
.condpart14
LDA inv_delay
CMP #15
BNE .skip14then
.condpart15
DEC inv_x
.skip14then
.skip13then
.skipL037
.L038 ; if inv_hit = 0 && inv_dir = 0 && inv_delay = 30 then inv_x = inv_x - 1
LDA inv_hit
CMP #0
BNE .skipL038
.condpart16
LDA inv_dir
CMP #0
BNE .skip16then
.condpart17
LDA inv_delay
CMP #30
BNE .skip17then
.condpart18
DEC inv_x
.skip17then
.skip16then
.skipL038
.
;
.L039 ; if inv_x < 26 then inv_dir = 1 : inv_x = 26 : inv_y = inv_y - 5
LDA inv_x
CMP #26
BCS .skipL039
.condpart19
LDA #1
STA inv_dir
LDA #26
STA inv_x
LDA inv_y
SEC
SBC #5
STA inv_y
.skipL039
.
;
.
;
.L040 ; player0x = inv_x - 8 : player0y = inv_y
LDA inv_x
SEC
SBC #8
STA player0x
LDA inv_y
STA player0y
.L041 ; return
tsx
lda 2,x ; check return address
eor #(>*) ; vs. current PCH
and #$E0 ; mask off all but top 3 bits
beq *+5 ; if equal, do normal return
JMP BS_return
RTS
.
;
.
;
.
;
.
;
.draw__move_inv_shot
; draw__move_inv_shot
.
;
.L042 ; player2:
LDX #<playerL042_2
STX player2pointerlo
LDA #>playerL042_2
STA player2pointerhi
LDA #9
STA player2height
.
;
.L043 ; COLUP2 = 14
LDA #14
STA COLUP2
.
;
.L044 ; inv_fire_delay = inv_fire_delay + 1
INC inv_fire_delay
.
;
.L045 ; if inv_fired = 0 && inv_fire_delay = 180 then inv_shot_x = inv_x : inv_shot_y = inv_y - 9
LDA inv_fired
CMP #0
BNE .skipL045
.condpart20
LDA inv_fire_delay
CMP #180
BNE .skip20then
.condpart21
LDA inv_x
STA inv_shot_x
LDA inv_y
SEC
SBC #9
STA inv_shot_y
.skip20then
.skipL045
.L046 ; if inv_fired = 0 && inv_fire_delay = 180 then player2x = inv_shot_x : player2y = inv_shot_y
LDA inv_fired
CMP #0
BNE .skipL046
.condpart22
LDA inv_fire_delay
CMP #180
BNE .skip22then
.condpart23
LDA inv_shot_x
STA player2x
LDA inv_shot_y
STA player2y
.skip22then
.skipL046
.L047 ; if inv_fired = 0 && inv_fire_delay = 180 then inv_fired = 1
LDA inv_fired
CMP #0
BNE .skipL047
.condpart24
LDA inv_fire_delay
CMP #180
BNE .skip24then
.condpart25
LDA #1
STA inv_fired
.skip24then
.skipL047
.
;
.L048 ; if inv_fired = 1 then inv_shot_y = inv_shot_y - 2 : player2y = inv_shot_y
LDA inv_fired
CMP #1
BNE .skipL048
.condpart26
LDA inv_shot_y
SEC
SBC #2
STA inv_shot_y
LDA inv_shot_y
STA player2y
.skipL048
.
;
.L049 ; if inv_shot_y < 12 then inv_fired = 0 : inv_fire_delay = 0 : inv_shot_y = 88 : player2y = inv_shot_y
LDA inv_shot_y
CMP #12
BCS .skipL049
.condpart27
LDA #0
STA inv_fired
STA inv_fire_delay
LDA #88
STA inv_shot_y
LDA inv_shot_y
STA player2y
.skipL049
.
;
.L050 ; return
tsx
lda 2,x ; check return address
eor #(>*) ; vs. current PCH
and #$E0 ; mask off all but top 3 bits
beq *+5 ; if equal, do normal return
JMP BS_return
RTS
.
;
.
;
.
;
.
;
.col_shot_inv
; col_shot_inv
.L051 ; if shot_x + 3 >= inv_x && shot_x + 3 <= inv_x + 6 && shot_y > inv_y then inv_hit = 1
; complex condition detected
LDA shot_x
CLC
ADC #3
; todo: this LDA is spurious and should be prevented -> LDA 1,x
CMP inv_x
BCC .skipL051
.condpart28
; complex condition detected
LDA inv_x
CLC
ADC #6
PHA
LDA shot_x
CLC
ADC #3
PHA
TSX
PLA
PLA
; todo: this LDA is spurious and should be prevented -> LDA 2,x
CMP 1,x
BCC .skip28then
.condpart29
LDA inv_y
CMP shot_y
BCS .skip29then
.condpart30
LDA #1
STA inv_hit
.skip29then
.skip28then
.skipL051
.
;
.L052 ; if inv_hit = 1 then inv_blast_delay = inv_blast_delay + 1
LDA inv_hit
CMP #1
BNE .skipL052
.condpart31
INC inv_blast_delay
.skipL052
.
;
.L053 ; if inv_blast_delay > 30 then score = score + 10 : inv_hit = 0 : gosub reset_blast
LDA #30
CMP inv_blast_delay
BCS .skipL053
.condpart32
SED
CLC
LDA score+2
ADC #$10
STA score+2
LDA score+1
ADC #$00
STA score+1
LDA score
ADC #$00
STA score
CLD
LDA #0
STA inv_hit
jsr .reset_blast
.skipL053
.
;
.L054 ; if inv_hit = 1 then player0:
LDA inv_hit
CMP #1
BNE .skipL054
.condpart33
LDX #<player33then_0
STX player0pointerlo
LDA #>player33then_0
STA player0pointerhi
LDA #9
STA player0height
.skipL054
.
;
.L055 ; return
tsx
lda 2,x ; check return address
eor #(>*) ; vs. current PCH
and #$E0 ; mask off all but top 3 bits
beq *+5 ; if equal, do normal return
JMP BS_return
RTS
.
;
.
;
.
;
.
;
.reset_blast
; reset_blast
.L056 ; player0:
LDX #<playerL056_0
STX player0pointerlo
LDA #>playerL056_0
STA player0pointerhi
LDA #9
STA player0height
.
;
.
;
.L057 ; inv_blast_delay = 0 : inv_x = ( rand & 117 ) + 26 : inv_y = 76
LDA #0
STA inv_blast_delay
; complex statement detected
sta temp7
lda #>(ret_point2-1)
pha
lda #<(ret_point2-1)
pha
lda #>(randomize-1)
pha
lda #<(randomize-1)
pha
lda temp7
pha
txa
pha
ldx #2
jmp BS_jsr
ret_point2
AND #117
CLC
ADC #26
STA inv_x
LDA #76
STA inv_y
.
;
.L058 ; return
tsx
lda 2,x ; check return address
eor #(>*) ; vs. current PCH
and #$E0 ; mask off all but top 3 bits
beq *+5 ; if equal, do normal return
JMP BS_return
RTS
.
;
.
;
.
;
.
;
.draw__move_turret
; draw__move_turret
.L059 ; player1:
LDX #<playerL059_1
STX player1pointerlo
LDA #>playerL059_1
STA player1pointerhi
LDA #9
STA player1height
.
;
.
;
.L060 ; _COLUP1 = 196
LDA #196
STA _COLUP1
.
;
.L061 ; if joy0left && tur_x >= 26 then tur_x = tur_x - 1
bit SWCHA
BVS .skipL061
.condpart34
LDA tur_x
CMP #26
BCC .skip34then
.condpart35
DEC tur_x
.skip34then
.skipL061
.L062 ; if joy0right && tur_x <= 143 then tur_x = tur_x + 1
bit SWCHA
BMI .skipL062
.condpart36
LDA #143
CMP tur_x
BCC .skip36then
.condpart37
INC tur_x
.skip36then
.skipL062
.
;
.
;
.
;
.
;
.L063 ; player1x = tur_x : player1y = tur_y
LDA tur_x
STA player1x
LDA tur_y
STA player1y
.
;
.L064 ; return
tsx
lda 2,x ; check return address
eor #(>*) ; vs. current PCH
and #$E0 ; mask off all but top 3 bits
beq *+5 ; if equal, do normal return
JMP BS_return
RTS
.
;
.
;
.
;
.
;
.draw__move_turret_shot
; draw__move_turret_shot
.L065 ; player3:
LDX #<playerL065_3
STX player3pointerlo
LDA #>playerL065_3
STA player3pointerhi
LDA #9
STA player3height
.
;
.L066 ; COLUP3 = 14
LDA #14
STA COLUP3
.
;
.L067 ; if joy0fire && tur_fired = 0 then tur_fired = 1 : shot_x = tur_x : shot_y = tur_y + 1 : player3x = shot_x : player3y = shot_y
bit INPT4
BMI .skipL067
.condpart38
LDA tur_fired
CMP #0
BNE .skip38then
.condpart39
LDA #1
STA tur_fired
LDA tur_x
STA shot_x
LDA tur_y
CLC
ADC #1
STA shot_y
LDA shot_x
STA player3x
LDA shot_y
STA player3y
.skip38then
.skipL067
.
;
.L068 ; if tur_fired = 1 then shot_y = shot_y + 2 : player3x = shot_x : player3y = shot_y
LDA tur_fired
CMP #1
BNE .skipL068
.condpart40
LDA shot_y
CLC
ADC #2
STA shot_y
LDA shot_x
STA player3x
LDA shot_y
STA player3y
.skipL068
.
;
.L069 ; if shot_y > 77 && ! joy0fire then tur_fired = 0 : shot_y = 0 : player3y = shot_y
LDA #77
CMP shot_y
BCS .skipL069
.condpart41
bit INPT4
BPL .skip41then
.condpart42
LDA #0
STA tur_fired
STA shot_y
LDA shot_y
STA player3y
.skip41then
.skipL069
.
;
.L070 ; return
tsx
lda 2,x ; check return address
eor #(>*) ; vs. current PCH
and #$E0 ; mask off all but top 3 bits
beq *+5 ; if equal, do normal return
JMP BS_return
RTS
.
;
.
;
.
;
.game_over
; game_over
.