RE: VIC memory D02E-D03F

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Hallo Nick,

> I have a concept for a video expansion device which adds a 
> CIA in the region
> D030-D03F. It should only need one TTL logic chip, the CIA 
> and original VIC
> and will socket back into the same spot.

Why not adding one by de-mirroring $DCxx or $DDxx? You can piggyback your
CIA on top of one of the existing ones and you only need one half of a
74LS139 to do the trick.
    ___
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  / /  |_/     Groetjes, Ruud
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   \___|       http://Ruud.C64.org

 

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