I haven't got one, but I'm dying of curiosity after trying to work
out the function of this "Colour Video Controller" cartridge for the
VIC-20, schematic and ROM from which are available here:
http://www.zimmers.net/anonftp/pub/cbm/schematics/cartridges/vic20/index.html

Perhaps also called the "Scrolling Text Interface".

I guess it may be part of some larger system, or maybe I'm just
missing the obvious, but I'd really love to find out the function
of this strange device if anyone happens to know. The VIC-20
shouldn't really need any help controlling colour video after all.

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