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This commit is contained in:
Samuel Walker 2025-03-21 13:58:03 -06:00
parent c245c5848a
commit 01943c4c8c
1 changed files with 84 additions and 81 deletions
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165
main.s
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@ -18,6 +18,56 @@
bg_pallets:
.byte $0F, $30, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
double_dabble:
lda #0
sta $01
sta $02
ldx #8
dabble:
; check first digit
lda $01
and #$F
jsr check
sta $03
lda #$F0
and $01
ora $03
sta $01
; check second digit
lda $01
and #$F0
lsr
lsr
lsr
lsr
jsr check
asl
asl
asl
asl
sta $03
lda #$F
and $01
ora $03
sta $01
; check third digit
lda $02
and #$F
jsr check
sta $03
lda #$F0
and $02
ora $03
sta $02
; Shift
clc
rol $00
rol $01
rol $02
lda $00
dex
bne dabble
rts
check:
cmp #5
@ -71,93 +121,46 @@ loop:
bne loop
lda #54
sta $00
lda #0
sta $01
sta $02
ldx #8
dabble:
; check first digit
lda $01
and #$F
jsr check
sta $03
lda #$F0
and $01
ora $03
sta $01
; check second digit
lda $01
and #$F0
lsr
lsr
lsr
lsr
jsr check
asl
asl
asl
asl
sta $03
lda #$F
and $01
ora $03
sta $01
; check third digit
lda $02
and #$F
jsr check
sta $03
lda #$F0
and $02
ora $03
sta $02
; Shift
clc
rol $00
rol $01
rol $02
lda $00
dex
bne dabble
lda $2002
lda #$20
sta $2006
lda #$20
sta $2006
lda $02
and #$F
cmp #0
bne :+
lda #10
: sta $2007
lda $01
and #$F0
lsr
lsr
lsr
lsr
cmp #0
bne :+
lda #10
: sta $2007
lda $01
and #$F
cmp #0
bne :+
lda #10
: sta $2007
lda #%10000000
sta $2000
lda #%00001010
sta $2001
lda $2002
lda #0
sta $2005
sta $2005
forever:
jmp forever
nmi:
inc $05
lda $05
sta $00
jsr double_dabble
lda $2002
lda #$20
sta $2006
lda #$20
sta $2006
lda $02
and #$F
cmp #0
bne :+
lda #10
: sta $2007
lda $01
and #$F0
lsr
lsr
lsr
lsr
cmp #0
bne :+
lda #10
: sta $2007
lda $01
and #$F
cmp #0
bne :+
lda #10
: sta $2007
lda #0
sta $2005
sta $2005
rti