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https://github.com/Michaelangel007/apple2_hgr_font_tutorial.git
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61 lines
1.4 KiB
ArmAsm
61 lines
1.4 KiB
ArmAsm
__MAIN = $1080
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.include "dos33.inc"
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.include "ca65.inc"
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KEYBOARD = $C000
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KEYSTROBE = $C010
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TXTCLR = $C050 ; Mode Graphics
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MIXCLR = $C052 ; Full screen
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MIXSET = $C053 ; Split screen
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PAGE1 = $C054
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HIRES = $C057 ; Mode HGR
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HgrLo = $F5
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HgrHi = $F6
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glyph = $FE
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DrawChar = $310
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HgrLoY = $3A0
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HgrHiY = $3B8
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AsciiTable
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BIT PAGE1 ; Page 1
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BIT TXTCLR ; not text, but graphics
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BIT MIXSET ; Split screen text/graphics
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BIT HIRES ; HGR, no GR
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LDA #0 ; glyph=0
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STA glyph ; save which glyph to draw
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LDY #8 ; Row=8
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_RowN
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LDA HgrLoY,Y
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STA HgrLo ; Screen Address Lo
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LDA HgrHiY,Y
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ORA #$20 ; HGR Page 1
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STA HgrHi ; Screen Address Hi
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LDY #00 ; Y = col
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_Glyph
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LDA glyph ; A = glyph
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JSR DrawChar
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INC glyph ; yes, ++glyph
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LDA glyph ;
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CMP #$20 ; done 16 chars?
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BEQ _Row1
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CMP #$40
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BEQ _Row2
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CMP #$60
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BEQ _Row3
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CMP #$80
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BNE _Glyph ;
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_Done RTS ; Optimization: BEQ _Row4
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_Row1 LDY #9
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BNE _RowN
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_Row2 LDY #10
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BNE _RowN
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_Row3 LDY #11
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BNE _RowN
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__END:
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