MediaWiki:Sitenotice:
2025-12-29: I have restored the wiki to a backup from the end of November. Starting in September 2025, accesses went form the 800MB-1.2GB range per month to 26GB in September, 42GB in October, and 70GB in November with most accesses originating from China. As soon as I realized what was causing all the access problems in November, I shut it down (it had reached 36GB by then) behind a password/login screen. The database had gotten corrupted, and I tried a restore from just before the spike in access but that didn't work. Thus, end of November. I still have the other daily backups so if there were any important additions in December, let me know and maybe they can be recovered. - Allen H.
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 | Shorthand | PMODE | SCREEN | $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 | 6C0 | 3 | 1,0 | d0 |
| Color Graphics 6 | 128 × 192 | 4 (WCMO) | 6144 | e0 | |||
| Resolution Graphics 6 | 256 × 192 | Green & White | 6144 | f0 | |||
| Resolution Graphics 6 | 256 × 192 | Black & White | 6144 | f8 |