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96 lines
1.8 KiB
Plaintext
96 lines
1.8 KiB
Plaintext
;license:MIT
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;(c) 2018 by 4am
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;
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!cpu 6502
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!to "build/FX.INDEXED/FOURSPIRAL",plain
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*=$6000
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!source "src/fx/macros.a"
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lda #$13
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sta $FB
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lda #$17
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sta $FD
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lda #$00
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sta $FA
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sta $FC
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@outerloop
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lda $FC
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sta $FE
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lda $FA
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sta $FF
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lda #$00
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sta $F9
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@loop lda $FE
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ldy $FF
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jsr HGRHalfBlockCopy
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lda #$27
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sec
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sbc $FF
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tay
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lda $FE
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jsr HGRHalfBlockCopy
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lda #$2F
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sec
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sbc $FE
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pha
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jsr HGRHalfBlockCopy
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pla
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ldy $FF
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jsr HGRHalfBlockCopy
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lda #$28
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jsr WaitForKeyWithTimeout
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bmi @exit
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ldx $F9
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bne @a
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inc $FF
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lda $FB
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cmp $FF
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bcs @loop
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inc $FC
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inc $F9
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lda $FC
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sta $FE
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lda $FB
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sta $FF
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@a dex
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bne @b
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inc $FE
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lda $FD
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cmp $FE
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bcs @loop
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dec $FB
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inc $F9
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lda $FD
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sta $FE
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lda $FB
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sta $FF
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@b dex
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bne @c
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dec $FF
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lda $FF
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cmp $FA
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bpl @loop
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lda $FD
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cmp $FC
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beq @exit
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dec $FD
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inc $F9
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lda $FD
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sta $FE
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lda $FA
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sta $FF
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@c dex
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bne @loop
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dec $FE
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lda $FE
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cmp $FC
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bpl @loop
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inc $FA
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beq @exit
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jmp @outerloop
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@exit rts
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!source "src/wait.a"
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+HGR_HALF_BLOCK_COPY_ROUTINES
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