Hmm, I'm not at all sure about this, but I think that my PCW has some sort of thermal cutout. If something happens, it will cutout. Then, after a number (?) of minutes, it will work again, assuming the problem (like an expansion unit re-seated) it will work again.
But now I think about it, this may NOT be original? Long ago, late 1980s maybe, my PCW went bang when I tried to daisy-chain two things on the expansion interface, and clearly something shorted. I took the system to a repair shop, and they fixed it. Maybe they did an official (or semi-official ?) upgrade? Since then, I have had a couple of problems that caused the system to NOT work, but after a delay, everything was OK again.
Anyone heard of anything like this before??
Oh, the CPS8256 should NOT be a problem, the way it fits on it's pretty much impossible to short anything. I tried to attach something else that had a pass-thru, with the CPS on the pass-thru, and clearly that was NOT as foolproof!
Geoff