MediaWiki:Sitenotice:
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2020-05-17: If a page gives you an error about some revision not being found, just EDIT the page and the old page should appear in the editor. If it does, just SAVE that and the page should be restored. OS-9 Al (talk) 12:22, 17 May 2020 (CDT)
VDG
The VDG or MC6847 is the video display generator from Motorola used in the TRS-80 Color Computer
It can display text and graphics within a matrix of 256 pixels wide by 192 lines high.
It can display a maximum of 9 colors: black, green, yellow, blue, red, buff (almost-but-not-quite white), cyan, magenta, and orange.
It is also used in the following computers of the time: Dragon 32/64, Laser 200 and Acorn Atom.
| Video Mode | Resolution | Colors | Bytes | $FF22 value |
|---|---|---|---|---|
| Alphanumeric Internal | 32 × 16 | 8 + Black | 512 | |
| Alphanumeric External | 32 × 16 | 8 + Black | 512 | |
| Semigraphics 4 | 64 × 32 | 8 + Black | 512 | |
| Semigraphics 6 | 64 × 48 | 4 + Black | 512 | |
| Color Graphics 1 | 64 × 64 | 4 | 1024 | |
| Resolution Graphics 1 | 128 × 64 | Black & White | 1024 | |
| Color Graphics 2 | 128 × 64 | 4 | 2048 | |
| Resolution Graphics 2 | 128 × 96 | Black & White | 1536 | |
| Color Graphics 3 | 128 × 96 | 4 | 3072 | |
| Resolution Graphics 3 | 128 × 192 | Black & White | 3072 | |
| Color Graphics 6 | 128 × 192 | 4 (GYBR) | 6144 | |
| Color Graphics 6 | 128 × 192 | 4 (WCMO) | 6144 | |
| Resolution Graphics 6 | 256 × 192 | Black & White | 6144 |