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KA10: Color TV #263

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larsbrinkhoff opened this issue Oct 13, 2021 · 1 comment
Open

KA10: Color TV #263

larsbrinkhoff opened this issue Oct 13, 2021 · 1 comment

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@larsbrinkhoff
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The MIT Logo PDP-11/45 had a "color TV" device. It was much like the Knight TV, except there are four bits per pixel and a color map. Since the Logo 11 Unibus was attached to the AI PDP-10, the 10 could also access the color TV. There are a few ITS applications for it: https://github.com/PDP-10/its/issues?q=label%3A%22color+display%22+%22color+tv%22

My plan would be to implement the device as seen from the 10 side, with no provisions for the 11 side of things. (Maybe in the future, there could be a fully fledged Logo PDP-11.)
@larsbrinkhoff
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I have now added the PDP-11 Logo TV hardware to SIMH, but not yet the color display configuration. Code in SITS suggests there were only four frame buffers, and that they must be combined to form a color frame buffer.

There is code in 11Logo, Lisp Logo, and KLH's SPIRO to use the color TV. Some hardware registers need to be poked to set up the configuration for a color display.

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@larsbrinkhoff