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Thanks for all the help here. I am going to get me a logic probe and move ahead as advised.
Will keep posting until I get this thing playing

Sorry for the noob question, but what's the best method for re-seating the chips?
They seem to be stuck in their sockets quite firmly and I am afraid to pull too hard. Is the any tool or recommended method for that?

Thanks Dave,

I didn't see that it was possible to upload an attachment so I tried to use the IMG tags with image URL. This apparently didn't work.
Anyway, I do have a soldering iron and a digital multimeter, that's about it.

I will try the stuff you suggested and will post back.

Noam

OK, so I pulled my Superboard II out of the basement after 30-something years it was lying there. Had to replace the old power supply with a new one, here they are side-by-side - https://picasaweb.google.com/117713064897825337874/OSI#5707460763861964962 And the video cable needed some soldering, her...