mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-12-28 09:30:41 +00:00
94 lines
1.1 KiB
ArmAsm
94 lines
1.1 KiB
ArmAsm
div7_table = $b800
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mod7_table = $b900
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hposn_high = $ba00
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hposn_low = $bb00
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;=====================
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; make /7 %7 tables
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;=====================
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hgr_make_tables:
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ldy #0
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lda #0
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ldx #0
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div7_loop:
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sta div7_table,Y
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inx
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cpx #7
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bne div7_not7
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clc
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adc #1
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ldx #0
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div7_not7:
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iny
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bne div7_loop
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ldy #0
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lda #0
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mod7_loop:
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sta mod7_table,Y
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clc
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adc #1
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cmp #7
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bne mod7_not7
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lda #0
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mod7_not7:
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iny
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bne mod7_loop
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; Hposn table
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lda #0
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hposn_loop:
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ldy #0
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ldx #0
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pha
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jsr HPOSN ; (Y,X),(A)
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pla
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tax
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lda GBASL
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sta hposn_low,X
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lda GBASH
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sta hposn_high,X
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inx
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txa
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cmp #192
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bne hposn_loop
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rts
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; left masks
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; in memory on screen
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; x111 1111 1111111 start at 0
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; x111 1110 0111111 start at 1
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; x111 1100 0011111 start at 2
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; ...
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; x100 0000 0000001 start at 6
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left_masks:
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.byte $FF,$FE,$FC,$F8, $F0,$E0,$C0
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; right masks
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; in memory on screen
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; x000 0001 1000000 end at 0
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; x000 0011 1100000 end at 1
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; x000 0111 1110000 end at 2
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; ...
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; x011 1111 1111110 end at 5
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; x111 1111 1111111 end at 6
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right_masks:
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.byte $81,$83,$87, $8F,$9F,$BF,$FF
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