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https://github.com/deater/dos33fsprogs.git
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56 lines
1.0 KiB
ArmAsm
56 lines
1.0 KiB
ArmAsm
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;=========================================================
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; clear_all
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;=========================================================
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; clear 48 rows
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; page in DRAW_PAGE
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; 45+4+(45*120)+5 = 5454
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gr_clear_all:
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clc ; 2
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lda DRAW_PAGE ; 3
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adc #4 ; 2
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sta __caf+2 ; 4
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sta __caf+5 ; 4
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adc #1 ; 2
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sta __caf+8 ; 4
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sta __caf+11 ; 4
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adc #1 ; 2
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sta __caf2+2 ; 4
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sta __caf2+5 ; 4
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adc #1 ; 2
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sta __caf2+8 ; 4
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sta __caf2+11 ; 4
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;===========
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; 45
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ldy #119 ; 2
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clear_all_color:
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lda #$00 ; 2
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;============
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; 4
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clear_all_fast_loop:
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__caf:
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sta $400,Y ; 5
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sta $480,Y ; 5
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sta $500,Y ; 5
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sta $580,Y ; 5
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__caf2:
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sta $600,Y ; 5
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sta $680,Y ; 5
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sta $700,Y ; 5
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sta $780,Y ; 5
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dey ; 2
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bpl clear_all_fast_loop ; 3
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;============
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; 45
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; -1
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rts ; 6
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gr_clear_all_end:
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.assert >gr_clear_all = >gr_clear_all_end, error, "gr_clear_all crosses page"
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