mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-18 21:06:31 +00:00
72 lines
866 B
ArmAsm
72 lines
866 B
ArmAsm
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GBASL = $26
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GBASH = $27
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HGR_BITS = $1C
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HGR_HMASK = $30
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HGR_X = $E0
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HGR_Y = $E2
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HGR_COLOR = $E4
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HGR_HORIZ = $E5
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HGRPAGE = $E6
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SAVEX = $FD
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TEMP = $FE
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OLD = $FF
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PAGE0 = $C054
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PAGE1 = $C055
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HGR = $F3E2
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HGR2 = $F3D8
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HCLR = $F3F2
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HPOSN = $F411
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HPLOT0 = $F457 ;; plot at (Y,X), (A)
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HPLOT1 = $F45A
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MOVE_RIGHT = $F48A
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HCOLOR1 = $F6F0
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WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
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tiny:
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jsr HGR2 ; clear page1
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; A is 0 after
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ldx #3
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jsr HCOLOR1
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tiny_yloop:
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ldy #0
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ldx #0 ; XX = 0
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yy_smc:
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lda #0 ; Y co-ord
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jsr HPOSN ; plot at (Y,X), (A)
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tiny_xloop:
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; lda (GBASL),Y
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; eor HGR_BITS
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; and HGR_HMASK
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; eor (GBASL),Y
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; sta (GBASL),Y
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; lda HGR_BITS
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; eor (GBASL),Y
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; and HGR_HMASK
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; eor (GBASL),Y
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; sta (GBASL),Y
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jsr HPLOT1
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jsr MOVE_RIGHT ; trashes A
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cpy #39
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bne tiny_xloop
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inc yy_smc+1
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jmp tiny_yloop
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