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https://github.com/deater/dos33fsprogs.git
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35 lines
397 B
ArmAsm
35 lines
397 B
ArmAsm
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;===============================
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; hlin
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;===============================
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; Y = y position
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; A = start
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; X = length
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hlin:
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clc
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adc gr_offsets,Y
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sta hlin_smc1+1
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sta hlin_smc2+1
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lda gr_offsets+1,Y
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clc
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adc DRAW_PAGE
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sta hlin_smc1+2
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sta hlin_smc2+2
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hlin_loop:
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hlin_smc1:
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lda $c00,X
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hlin_mask_smc:
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and #$f0
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hlin_color_smc:
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ora #$01
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hlin_smc2:
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sta $c00,X
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dex
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bpl hlin_loop
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rts
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