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VDG

From CoCopedia - The Tandy/Radio Shack Color Computer Wiki
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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
Color Graphics 6 128 × 192 4 (WCMO) 6144
Resolution Graphics 6 256 × 192 Black & White 6144 f8