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conway-unsafe.asm
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// Variable Labels
.label shadow = $0334
.label board = $0336
.label colour = $0338
.label n = $033A
.label alive = $033B
.label i = $033C
.label arg0 = $033E
.label arg1 = $0340
.label k = $0342
.label a = $0343
.label oldD020 = $0344
.label oldD021 = $0345
.label oldChar = $0346
* = $0801
BasicUpstart($0834)
* = $0834
lda #$00
ldx #$C0
sta shadow
stx shadow+1
ldx #$04
sta board
stx board+1
ldx #$D8
sta colour
stx colour+1
jsr saveregs
jsr SIDRND // initialize random number generator
sei
lda $01
and #$F8
ora #$06
sta $01
cli
lda #$0C
sta $D020
lda #$0C
sta $D021
jsr clearShadowAndBoard
lda #$9B
jsr $FFD2
clc
ldy #$00
ldx #$18
jsr $FFF0
lda #<STRLBL0
sta $02
lda #>STRLBL0
sta $03
jsr PRN
jsr randomizeBoard
ldy #$00
LBL1L0:
lda $C028,Y
sta $0428,Y
iny
cpy #$FF
beq LBL1L1
jmp LBL1L0
LBL1L1:
ldy #$00
LBL1L2:
lda $C127,Y
sta $0527,Y
iny
cpy #$FF
beq LBL1L3
jmp LBL1L2
LBL1L3:
ldy #$00
LBL1L4:
lda $C226,Y
sta $0626,Y
iny
cpy #$FF
beq LBL1L5
jmp LBL1L4
LBL1L5:
ldy #$00
LBL1L6:
lda $C325,Y
sta $0725,Y
iny
cpy #$9A
beq LBL1L7
jmp LBL1L6
LBL1L7:
lda $CB
sta k
lda $02
pha
lda $03
pha
php
clc
LBL1L8:
LBL1L9: // Top of WHILE Loop
lda k // $0342
cmp #$3E
.byte $D0, $03 // BNE +3
jmp LBL1L11 // if z==1 jump to ELSE
LBL1L10:
lda $02
pha
lda $03
pha
php
clc
LBL2L0:
lda #$28
ldx #$00
sta i
stx i+1
LBL2L1: // Top of FOR Loop
lda i+1
cmp #$03
.byte $D0, $05 // BNE +5
lda i
cmp #$98
.byte $B0, $03 // BCS +3
jmp LBL2L3 // if c==0 jump to BODY
jmp LBL2L4 // jump out of FOR
LBL2L2:
clc
lda #$01
adc i
pha
lda #$00
adc i+1
tax
pla
sta i
stx i+1
jmp LBL2L1 // jump to top of FOR loop
LBL2L3:
lda #$00
sta n // 033A
clc
lda i
adc #$00
tay
lda i+1
adc #$04
tax
tya
sta arg0
stx arg0+1
clc
lda i
adc #$00
tay
lda i+1
adc #$C0
tax
tya
sta arg1
stx arg1+1
lda $02
pha
lda $03
pha
php
LBL3L0:
sec
lda $033E
sbc #$29
pha
lda $033F
sbc #$00
tax
pla
sta $02
ldy #$00
stx $03
lda ($02),Y
LBL3L1: // Top of IF statement
cmp #$20
.byte $D0, $03 // BNE +3
jmp LBL3L3 // if z==1 jump to ELSE
LBL3L2:
inc n
LBL3L3:
LBL3L4:
LBL3L5:
sec
lda $033E
sbc #$28
pha
lda $033F
sbc #$00
tax
pla
sta $02
ldy #$00
stx $03
lda ($02),Y
LBL3L6: // Top of IF statement
cmp #$20
.byte $D0, $03 // BNE +3
jmp LBL3L8 // if z==1 jump to ELSE
LBL3L7:
inc n
LBL3L8:
LBL3L9:
LBL3L10:
sec
lda $033E
sbc #$27
pha
lda $033F
sbc #$00
tax
pla
sta $02
ldy #$00
stx $03
lda ($02),Y
LBL3L11: // Top of IF statement
cmp #$20
.byte $D0, $03 // BNE +3
jmp LBL3L13 // if z==1 jump to ELSE
LBL3L12:
inc n
LBL3L13:
LBL3L14:
LBL3L15:
sec
lda $033E
sbc #$01
pha
lda $033F
sbc #$00
tax
pla
sta $02
ldy #$00
stx $03
lda ($02),Y
LBL3L16: // Top of IF statement
cmp #$20
.byte $D0, $03 // BNE +3
jmp LBL3L18 // if z==1 jump to ELSE
LBL3L17:
inc n
LBL3L18:
LBL3L19:
LBL3L20:
clc
lda #$01
adc arg0
pha
lda #$00
adc arg0+1
tax
pla
sta $02
ldy #$00
stx $03
lda ($02),Y
LBL3L21: // Top of IF statement
cmp #$20
.byte $D0, $03 // BNE +3
jmp LBL3L23 // if z==1 jump to ELSE
LBL3L22:
inc n
LBL3L23:
LBL3L24:
LBL3L25:
clc
lda #$27
adc arg0
pha
lda #$00
adc arg0+1
tax
pla
sta $02
ldy #$00
stx $03
lda ($02),Y
LBL3L26: // Top of IF statement
cmp #$20
.byte $D0, $03 // BNE +3
jmp LBL3L28 // if z==1 jump to ELSE
LBL3L27:
inc n
LBL3L28:
LBL3L29:
LBL3L30:
clc
lda #$28
adc arg0
pha
lda #$00
adc arg0+1
tax
pla
sta $02
ldy #$00
stx $03
lda ($02),Y
LBL3L31: // Top of IF statement
cmp #$20
.byte $D0, $03 // BNE +3
jmp LBL3L33 // if z==1 jump to ELSE
LBL3L32:
inc n
LBL3L33:
LBL3L34:
LBL3L35:
clc
lda #$29
adc arg0
pha
lda #$00
adc arg0+1
tax
pla
sta $02
ldy #$00
stx $03
lda ($02),Y
LBL3L36: // Top of IF statement
cmp #$20
.byte $D0, $03 // BNE +3
jmp LBL3L38 // if z==1 jump to ELSE
LBL3L37:
inc n
LBL3L38:
LBL3L39:
clc
LBL3L40:
ldy #$00
lda arg0
ldx arg0+1
sta $02
stx $03
lda ($02),Y
LBL3L41: // Top of IF statement
cmp #$20
.byte $F0, $03 // BEQ +3
jmp LBL3L43 // jump to ELSE
LBL3L42:
lda $02
pha
lda $03
pha
php
clc
LBL4L0:
LBL4L1: // Top of IF statement
lda n // $033A
cmp #$03
.byte $F0, $03 // BEQ +3
jmp LBL4L3 // jump to ELSE
LBL4L2:
lda arg1
sta LBL5L0
lda arg1+1
sta LBL5L1
lda #$51
.byte $8D // <-- STA absolute
LBL5L0: // <-- low byte
.byte $00
LBL5L1: // <-- hi byte
.byte $00
LBL4L3:
LBL4L4:
plp
pla
sta $03
pla
sta $02
jmp LBL3L44
LBL3L43:
lda $02
pha
lda $03
pha
php
clc
LBL4L5:
LBL4L6: // Top of IF statement
lda n // $033A
cmp #$02
.byte $90, $03 // BCC +3
jmp LBL4L8 // jump to ELSE
LBL4L7:
lda arg1
sta LBL5L2
lda arg1+1
sta LBL5L3
lda #$20
.byte $8D // <-- STA absolute
LBL5L2: // <-- low byte
.byte $00
LBL5L3: // <-- hi byte
.byte $00
LBL4L8:
LBL4L9:
clc
LBL4L10:
LBL4L11: // Top of IF statement
lda n // $033A
cmp #$03
.byte $B0, $03 // BCS +3
jmp LBL4L13 // if c==0 jump to ELSE
.byte $D0, $03 // BNE +3
jmp LBL4L13 // if z==1 jump to ELSE
LBL4L12:
lda arg1
sta LBL5L4
lda arg1+1
sta LBL5L5
lda #$20
.byte $8D // <-- STA absolute
LBL5L4: // <-- low byte
.byte $00
LBL5L5: // <-- hi byte
.byte $00
LBL4L13:
LBL4L14:
plp
pla
sta $03
pla
sta $02
LBL3L44:
plp
pla
sta $03
pla
sta $02
jmp LBL2L2 // jump to iterator
LBL2L4:
plp
pla
sta $03
pla
sta $02
ldy #$00
LBL2L5:
lda $C028,Y
sta $0428,Y
iny
cpy #$FF
beq LBL2L6
jmp LBL2L5
LBL2L6:
ldy #$00
LBL2L7:
lda $C127,Y
sta $0527,Y
iny
cpy #$FF
beq LBL2L8
jmp LBL2L7
LBL2L8:
ldy #$00
LBL2L9:
lda $C226,Y
sta $0626,Y
iny
cpy #$FF
beq LBL2L10
jmp LBL2L9
LBL2L10:
ldy #$00
LBL2L11:
lda $C325,Y
sta $0725,Y
iny
cpy #$9A
beq LBL2L12
jmp LBL2L11
LBL2L12:
lda $CB
sta k // 0342
lda $02
pha
lda $03
pha
php
clc
LBL2L13:
LBL2L14: // Top of IF statement
lda k // $0342
cmp #$11
.byte $F0, $03 // BEQ +3
jmp LBL2L16 // jump to ELSE
LBL2L15:
jsr randomizeBoard
LBL2L16:
LBL2L17:
clc
LBL2L18:
LBL2L19: // Top of IF statement
lda k // $0342
cmp #$1D
.byte $F0, $03 // BEQ +3
jmp LBL2L21 // jump to ELSE
LBL2L20:
clc
ldy #$00
ldx #$18
jsr $FFF0
lda #<STRLBL1
sta $02
lda #>STRLBL1
sta $03
jsr PRN
LBL2L21:
LBL2L22:
plp
pla
sta $03
pla
sta $02
jmp LBL1L9 // jump to top of WHILE loop
LBL1L11:
plp
pla
sta $03
pla
sta $02
lda #$00
sta $C6
jsr $FFE4
jsr clearShadowAndBoard
jsr restoreregs
clc
ldy #$0A
ldx #$0A
jsr $FFF0
lda #$05
jsr $FFD2
lda #<STRLBL2
sta $02
lda #>STRLBL2
sta $03
jsr PRN
lda #$9A
jsr $FFD2
lda #<STRLBL3
sta $02
lda #>STRLBL3
sta $03
jsr PRN
sei
lda #$37 // Default Value
sta $01
cli
rts
LBL0L0:
randomizeBoard:
lda $02
pha
lda $03
pha
php
clc
LBL1L12:
lda #$28
ldx #$00
sta i
stx i+1
LBL1L13: // Top of FOR Loop
lda i+1
cmp #$03
.byte $D0, $05 // BNE +5
lda i
cmp #$98
.byte $B0, $03 // BCS +3
jmp LBL1L15 // if c==0 jump to BODY
jmp LBL1L16 // jump out of FOR
LBL1L14:
clc
lda #$01
adc i
pha
lda #$00
adc i+1
tax
pla
sta i
stx i+1
jmp LBL1L13 // jump to top of FOR loop
LBL1L15:
lda $D41B
sta a
lda $02
pha
lda $03
pha
php
clc
LBL2L23:
LBL2L24: // Top of IF statement
lda a // $0343
cmp #$7F
.byte $B0, $03 // BCS +3
jmp LBL2L26 // if c==0 jump to ELSE
.byte $D0, $03 // BNE +3
jmp LBL2L26 // if z==1 jump to ELSE
LBL2L25:
lda #$51
sta a // 0343
jmp LBL2L27
LBL2L26:
lda #$20
sta a // 0343
LBL2L27:
plp
pla
sta $03
pla
sta $02
clc
lda board
adc i
tay
lda board+1
adc i+1
tax
tya
sta LBL2L28
stx LBL2L29
lda a
.byte $8D // <-- STA absolute
LBL2L28: // <-- low byte
.byte $00
LBL2L29: // <-- hi byte
.byte $00
clc
lda shadow
adc i
tay
lda shadow+1
adc i+1
tax
tya
sta LBL2L30
stx LBL2L31
lda a
.byte $8D // <-- STA absolute
LBL2L30: // <-- low byte
.byte $00
LBL2L31: // <-- hi byte
.byte $00
jmp LBL1L14 // jump to iterator
LBL1L16:
plp
pla
sta $03
pla
sta $02
rts
LBL0L1:
clearShadowAndBoard:
lda $02
pha
lda $03
pha
php
clc
LBL1L17:
lda #$00
tax
sta i
stx i+1
LBL1L18: // Top of FOR Loop
lda i+1
cmp #$03
.byte $D0, $05 // BNE +5
lda i
cmp #$E8
.byte $B0, $03 // BCS +3
jmp LBL1L20 // if c==0 jump to BODY
jmp LBL1L21 // jump out of FOR
LBL1L19:
clc
lda #$01
adc i
pha
lda #$00
adc i+1
tax
pla
sta i
stx i+1
jmp LBL1L18 // jump to top of FOR loop
LBL1L20:
clc
lda board
adc i
tay
lda board+1
adc i+1
tax
tya
sta LBL2L32
stx LBL2L33
lda #$20
.byte $8D // <-- STA absolute
LBL2L32: // <-- low byte
.byte $00
LBL2L33: // <-- hi byte
.byte $00
clc
lda shadow
adc i
tay
lda shadow+1
adc i+1
tax
tya
sta LBL2L34
stx LBL2L35
lda #$20
.byte $8D // <-- STA absolute
LBL2L34: // <-- low byte
.byte $00
LBL2L35: // <-- hi byte
.byte $00
clc
lda colour
adc i
tay
lda colour+1
adc i+1
tax
tya
sta LBL2L36
stx LBL2L37
lda #$01
.byte $8D // <-- STA absolute
LBL2L36: // <-- low byte
.byte $00
LBL2L37: // <-- hi byte
.byte $00
jmp LBL1L19 // jump to iterator
LBL1L21:
plp
pla
sta $03
pla
sta $02
rts
LBL0L2:
saveregs:
lda $D020
sta oldD020
lda $D021
sta oldD021
lda $0286
sta oldChar
rts
LBL0L3:
restoreregs:
lda oldD020
sta $D020
lda oldD021
sta $D021
lda oldChar
sta $0286
rts
SIDRND:
pha
lda #$FF
sta $D40E
sta $D40F
lda #$80
sta $D412
pla
rts
PRN:
ldy #$00
PRN_LOOP:
lda ($02),Y
beq PRN_END
jsr $FFD2
iny
jmp PRN_LOOP
PRN_END:
rts
// ; $deb " CONWAYS GAME OF LIFE HOLD H, R OR Q"
STRLBL0:
.byte $20, $43, $4F, $4E, $57, $41, $59, $53, $20, $47, $41, $4D, $45, $20, $4F, $46, $20, $4C, $49, $46, $45, $20, $20, $20, $20, $48, $4F, $4C, $44, $20, $48, $2C, $20, $52, $20, $4F, $52, $20, $51, $00
// ; $e13 " "
STRLBL1:
.byte $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $20, $00
// ; $e3b "CONWAYS GAME OF LIFE\n\n"
STRLBL2:
.byte $43, $4F, $4E, $57, $41, $59, $53, $20, $47, $41, $4D, $45, $20, $4F, $46, $20, $4C, $49, $46, $45, $0D, $0D, $00
// ; $e52 " PROGRAMMED BY: MICHAEL K. PELLEGRINO\n USING HIS 6502 C COMPILER 2023 04 07\n\n GITHUB.COM/MKPELLEGRINO\n"
STRLBL3:
.byte $20, $20, $50, $52, $4F, $47, $52, $41, $4D, $4D, $45, $44, $20, $42, $59, $3A, $20, $4D, $49, $43, $48, $41, $45, $4C, $20, $4B, $2E, $20, $50, $45, $4C, $4C, $45, $47, $52, $49, $4E, $4F, $0D, $20, $55, $53, $49, $4E, $47, $20, $48, $49, $53, $20, $36, $35, $30, $32, $20, $43, $20, $43, $4F, $4D, $50, $49, $4C, $45, $52, $20, $20, $20, $32, $30, $32, $33, $20, $30, $34, $20, $30, $37, $0D, $0D, $20, $20, $20, $20, $20, $20, $20, $20, $20, $47, $49, $54, $48, $55, $42, $2E, $43, $4F, $4D, $2F, $4D, $4B, $50, $45, $4C, $4C, $45, $47, $52, $49, $4E, $4F, $0D, $00