Apple-2-SW/apple2_hgr_font_tutorial
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Add Text Screen holes

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Michaelangel007 2017-07-18 19:00:57 -07:00
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@ -2062,6 +2062,37 @@ For our final trick we are going to copy the characters off the text screen onto
The text screen, like the HGR screen, is also non-linear, and also broken up into a triad:
|Row| Text Address | Screen Hole |
|--:|:------------:|:------------:|
| 0 | $400 .. $427 | n/a |
| 1 | $480 .. $4A7 | n/a |
| 2 | $500 .. $527 | n/a |
| 3 | $580 .. $5A7 | n/a |
| 4 | $600 .. $627 | n/a |
| 5 | $600 .. $6A7 | n/a |
| 6 | $700 .. $727 | n/a |
| 7 | $780 .. $7A7 | n/a |
| - | -- | -- |
| 8 | $428 .. $44F | n/a |
| 9 | $4A8 .. $4CF | n/a |
|10 | $528 .. $54F | n/a |
|11 | $5A8 .. $5CF | n/a |
|12 | $628 .. $64F | n/a |
|13 | $6A8 .. $6CF | n/a |
|14 | $728 .. $74F | n/a |
|15 | $7A8 .. $7CF | n/a |
| - | -- | -- |
|16 | $450 .. $477 | $478 .. $47F |
|17 | $4D0 .. $4F7 | $4F8 .. $4FF |
|18 | $550 .. $577 | $578 .. $57F |
|19 | $5D0 .. $5F7 | $5F8 .. $5FF |
|20 | $650 .. $677 | $678 .. $67F |
|21 | $6D0 .. $6F7 | $6F8 .. $6FF |
|22 | $750 .. $777 | $778 .. $77F |
|23 | $7D0 .. $7F7 | $7F8 .. $7FF |
Analzying both the Text and HGR addresses:
|Row|Text Address|HGR Address|HGR Scanline|
|--:|:----:|:-----:|---:|
| 0 | $400 | $2000 | 0|