Motorola 6847

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Mc6847.png

The MC6847 is a video display generator (VDG) first introduced by Motorola and used in the TRS-80 Color Computer, Dragon 32/64, Laser 200 and Acorn Atom, among others. It is a relatively simple display generator compared to other display chips of the time. It is capable of displaying text and graphics contained within a roughly square display matrix 256 pixels wide by 192 lines high. It is capable of displaying nine colors: black, green, yellow, blue, red, buff (almost-but-not-quite white), cyan, magenta, and orange. The low display resolution is a necessity of using television sets as display monitors. Making the display wider risked cutting off characters due to overscan. Compressing more dots into the display window would easily exceed the resolution of the television and be useless.

Video modes[edit]

Video Mode Resolution Colours Bytes
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 1 + Black 1024
Color Graphics 2 128 × 64 4 2048
Resolution Graphics 2 128 × 96 1 + Black 1536
Color Graphics 3 128 × 96 4 3072
Resolution Graphics 3 128 × 192 1 + Black 3072
Color Graphics 6 128 × 192 4 6144
Resolution Graphics 6 256 × 192 1 + Black 6144

See also[edit]

References[edit]