[Coco] [HW] Coco 3 video output corrupt when using cart port

[Brian Sturk]

Hi there,

I have a very good condition Coco 3 (bought sealed new, used a few 
times) and I just recently started using the cart port/bus.  I've used 
cartridge games and the SVD virtual disk drive device and when using 
them the video output gets very garbly.  Any ideas on what it might be?  
At first I thought it was the SVD but it happens with the games also.

Hopefully a kind coco hw guru will have some ideas.   :) 
I'm going to go poke around looking for schematics and a way to search 
the mailing list archives.

thanks,
~telengard

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