Apple-2-SW/apple2_hgr_font_tutorial
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Cleanup hex constant for SBC

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michaelangel007 2016-01-10 23:52:23 -08:00
parent 9eb9451304
commit 9516310e1b
1 changed files with 2 additions and 2 deletions
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README.md
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@ -684,7 +684,7 @@ Here's the C pseudo-code of the assembly code:
```c ```c
char c = '@'; // 0x40; char c = '@'; // 0x40;
int col = 0; int col = 0;
char FONT[] = { ... }; // our font data glyphs char FONT[] = { ... }; // our font data glyphs starting at 0x6000
char *screen = 0x2000 + col; // destination char *screen = 0x2000 + col; // destination
char *font = 0x6200; // eventually want: &FONT[ c*8 ] char *font = 0x6200; // eventually want: &FONT[ c*8 ]
for( y = 0; y < 8; y++, screen += 0x400 ) for( y = 0; y < 8; y++, screen += 0x400 )
@ -711,7 +711,7 @@ After drawing a character with `DrawChar()` it is handy if we can advance both:
370:C8 INY 370:C8 INY
371:18 CLC 371:18 CLC
372:A5 F6 LDA $F6 372:A5 F6 LDA $F6
374:E9 1F SBC #1F 374:E9 1F SBC #$1F
376:85 F6 STA $F6 376:85 F6 STA $F6
378:60 RTS 378:60 RTS
``` ```