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https://github.com/deater/dos33fsprogs.git
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54 lines
571 B
ArmAsm
54 lines
571 B
ArmAsm
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; fake sierpinski
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; just plot X AND Y
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; 51 initial
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; 46, put YY in X
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; 39, optimized to death?
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.include "zp.inc"
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.include "hardware.inc"
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;================================
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; Clear screen and setup graphics
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;================================
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sier:
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jsr SETGR ; set lo-res 40x40 mode
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bit FULLGR ; make it 40x48
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lda #39
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sta XX
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sier_xloop:
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ldx #47
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sier_yloop:
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txa
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and XX
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bne black
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lda #$11 ; red
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.byte $2C ; bit trick
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black:
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lda #$00
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sta COLOR
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ldy XX
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txa
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jsr PLOT ; PLOT AT Y,A
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dex
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bpl sier_yloop
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dec XX
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bpl sier_xloop
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done:
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bmi done
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