Something like this would be my guess as well. I don't know what the IIGS video circuitry looks like, but that looks an awful lot like the most significant of the character ROM row-select address lines has come disconnected and it's just cycling through the top half of the character a second time instead of continuing on to the bottom half.
Post #9 by commodorejohn
| Source Forum | 68kMLA |
|---|---|
| Category | Troubleshooting |
| Post Date | Mon, 25 May 2015 - 22:45 |
| Original URL | https://68kmla.org/bb/threads/apple-iigs-text-mode-doubled.2004/ |
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