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conway-op.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
lda $D020
sta oldD020
lda $D021
sta oldD021
lda $0286
sta oldChar
lda #$FF
sta $D40E
sta $D40F
lda #$80
sta $D412
sei
lda $01
and #$F8
ora #$06
sta $01
cli
lda #$0C
sta $D020
sta $D021
jsr clearShadowAndBoard
lda #$9B
jsr $FFD2
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
bne LBL1L0
ldy #$00
LBL1L2:
lda $C127,Y
sta $0527,Y
iny
cpy #$FF
bne LBL1L2
ldy #$00
LBL1L4:
lda $C226,Y
sta $0626,Y
iny
cpy #$FF
bne LBL1L4
ldy #$00
LBL1L6:
lda $C325,Y
sta $0725,Y
iny
cpy #$9A
bne LBL1L6
lda $CB
sta k
php
clc
LBL1L9:
lda k
cmp #$3E
bne !_skip+
jmp LBL1L11 // too far for a Branch Instr.
!_skip:
php
clc
lda #$28
ldx #$00
sta i
stx i+1
LBL2L1: // Top of FOR Loop
lda i+1
cmp #$03
bne !+
lda i
cmp #$98
!:
//bcs !+
//jmp LBL2L3 // if c==0 jump to BODY
bcc LBL2L3 // if c==0 jump to BODY
//!:
jmp LBL2L4 // jump out of FOR
LBL2L2:
clc
lda #$01
adc i
sta i
lda #$00
adc i+1
sta i+1
jmp LBL2L1 // jump to top of FOR loop
LBL2L3:
lda #$00
sta n
clc
lda i
adc #$00
sta arg0
lda i+1
adc #$04
sta arg0+1
clc
lda i
adc #$00
sta arg1
lda i+1
adc #$C0
sta arg1+1
php
sec
lda arg0
sbc #$29
sta $02
lda arg0+1
sbc #$00
sta $03
ldy #$00
lda ($02),Y
cmp #$20
beq LBL3L3 // if z==1 jump to ELSE
inc n
LBL3L3:
sec
lda arg0
sbc #$28
sta $02
lda arg0+1
sbc #$00
sta $03
ldy #$00
lda ($02),Y
cmp #$20
beq LBL3L8 // if z==1 jump to ELSE
inc n
LBL3L8:
sec
lda arg0
sbc #$27
sta $02
lda arg0+1
sbc #$00
sta $03
ldy #$00
lda ($02),Y
tax
cmp #$20
beq LBL3L13 // if z==1 jump to ELSE
inc n
LBL3L13:
sec
lda arg0
sbc #$01
sta $02
lda arg0+1
sbc #$00
sta $03
ldy #$00
lda ($02),Y
cmp #$20
beq LBL3L18 // if z==1 jump to ELSE
inc n
LBL3L18:
clc
lda #$01
adc arg0
sta $02
lda #$00
adc arg0+1
sta $03 // added
ldy #$00
lda ($02),Y
cmp #$20
beq LBL3L23 // if z==1 jump to ELSE
inc n
LBL3L23:
clc
lda #$27
adc arg0
sta $02
lda #$00
adc arg0+1
sta $03
ldy #$00
lda ($02),Y
cmp #$20
beq LBL3L28 // if z==1 jump to ELSE
inc n
LBL3L28:
clc
lda #$28
adc arg0
sta $02
lda #$00
adc arg0+1
sta $03
ldy #$00
lda ($02),Y
cmp #$20
beq LBL3L33 // if z==1 jump to ELSE
inc n
LBL3L33:
clc
lda #$29
adc arg0
sta $02
lda #$00
adc arg0+1
sta $03
ldy #$00
lda ($02),Y
cmp #$20
beq LBL3L38 // if z==1 jump to ELSE
inc n
LBL3L38:
ldy #$00
lda arg0
ldx arg0+1
sta !+
stx !++
.byte $AD
!:
.byte $00
!:
.byte $00
cmp #$20
bne LBL3L43 // jump to ELSE mkp
php
lda n
cmp #$03
bne LBL4L3 // jump to ELSE
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:
plp
jmp LBL3L44
LBL3L43:
php
lda n
cmp #$02
//bcc !_skip+
//jmp LBL4L8 // jump to ELSE
bcs LBL4L8
//!_skip:
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:
clc
lda n
cmp #$03
//bcs !_skip+
//jmp LBL4L13 // if c==0 jump to ELSE
bcc LBL4L13
//!_skip:
//bne !_skip+
beq LBL4L13 // if z==1 jump to ELSE
//!_skip:
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:
plp
LBL3L44:
plp
jmp LBL2L2 // jump to iterator
LBL2L4:
plp
ldy #$00
LBL2L5:
lda $C028,Y
sta $0428,Y
iny
cpy #$FF
bne LBL2L5
ldy #$00
LBL2L7:
lda $C127,Y
sta $0527,Y
iny
cpy #$FF
bne LBL2L7
ldy #$00
LBL2L9:
lda $C226,Y
sta $0626,Y
iny
cpy #$FF
bne LBL2L9
ldy #$00
LBL2L11:
lda $C325,Y
sta $0725,Y
iny
cpy #$9A
bne LBL2L11
lda $CB
sta k
php
clc
lda k
cmp #$11
bne LBL2L16 // jump to ELSE
jsr randomizeBoard
LBL2L16:
lda k
cmp #$1D
bne LBL2L21 // jump to ELSE
clc
ldy #$00
ldx #$18
jsr $FFF0
lda #<STRLBL1
sta $02
lda #>STRLBL1
sta $03
jsr PRN
LBL2L21:
plp
jmp LBL1L9 // jump to top of WHILE loop
LBL1L11:
plp
lda #$00
sta $C6
jsr $FFE4
jsr clearShadowAndBoard
lda oldD020
sta $D020
lda oldD021
sta $D021
lda oldChar
sta $0286
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
randomizeBoard:
php
lda #$28
ldx #$00
sta i
stx i+1
LBL1L13: // Top of FOR Loop
lda i+1
cmp #$03
bne !+
lda i
cmp #$98
!:
//bcs !+
//jmp LBL1L15 // if c==0 jump to BODY
bcc LBL1L15
//!:
plp
rts
LBL1L14:
clc
lda #$01
adc i
sta i
lda #$00
adc i+1
sta i+1
jmp LBL1L13 // jump to top of FOR loop
LBL1L15:
lda $D41B
sta a
php
lda a
cmp #$7F
//bcs !_skip+
//jmp LBL2L26 // if c==0 jump to ELSE
bcc LBL2L26 // if c==0 jump to ELSE
//!_skip:
beq LBL2L26 // if z==1 jump to ELSE
lda #$51
sta a
jmp LBL2L27
LBL2L26:
lda #$20
sta a
LBL2L27:
plp
clc
lda board
adc i
sta !+
lda board+1
adc i+1
sta !++
lda a
.byte $8D // <-- STA absolute
!:
.byte $00
!:
.byte $00
clc
lda shadow
adc i
sta !+
lda shadow+1
adc i+1
sta !++
lda a
.byte $8D // <-- STA absolute
!:
.byte $00
!:
.byte $00
jmp LBL1L14 // jump to iterator
plp
rts
clearShadowAndBoard:
lda #$00
sta i
sta i+1
LBL1L18: // Top of FOR Loop
cmp #$03
bne !+
lda i
cmp #$E8
!:
//bcs !+
//jmp LBL1L20 // if c==0 jump to BODY
bcc LBL1L20
//!:
rts
LBL1L19:
clc
lda #$01
adc i
sta i
lda #$00
adc i+1
sta i+1
jmp LBL1L18 // jump to top of FOR loop
LBL1L20:
clc
lda board
adc i
sta !+
lda board+1
adc i+1
sta !++
lda #$20
.byte $8D // <-- STA absolute
!:
.byte $00
!:
.byte $00
clc
lda shadow
adc i
sta !+
lda shadow+1
adc i+1
sta !++
lda #$20
.byte $8D // <-- STA absolute
!:
.byte $00
!:
.byte $00
clc
lda colour
adc i
sta !+
lda colour+1
adc i+1
sta !++
lda #$01
.byte $8D // <-- STA absolute
!:
.byte $00
!:
.byte $00
jmp LBL1L19 // jump to iterator
rts
PRN:
ldy #$00
!:
lda ($02),Y
beq !+
jsr $FFD2
iny
jmp !-
!:
rts
!:
.byte $00
// ; $de5 " 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
// ; $e0d " "
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
// ; $e35 "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
// ; $e4c " 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