> From: Lou > > I had a similar problem and it had me stuck for months. I > finally located a bad 3 pin RAM selection jumper switch on > the board. It had become slightly corroded. Once replaced > with a nice new gold one (including jumper), things started > working properly. My bad for not checking it earlier. Anyway > it’s easy to rule it out and maybe worth checking. It's a good idea, in an old Polaris that isn't running, to reseat every connector, including partially lifting and reinserting every socketed chip. There are a number of jumpers, including a 4x4 block of pins that routes interrupts and DMA requests. Sliding each jumper off and on a couple of times is a good idea. I've not seen any that were fatally corroded, but I suppost that can happen if there was enough moisture. -- Ciao, Paul D. DeRocco Paul mailto:pderocco@...m
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RE: [chromapolaris] ADC Range Adjustment
2019-07-23 by Paul D. DeRocco