I very stupidly tried to attach on of my logic probe leads to the R/W
line on a card in my platinum IIe while it was still powered on and I
believe I crossed that signal with the -12v line above it.
When I turn on the IIe I now get a constant beep through the speaker
and video is filled with a constant character (not sure of the value
but it looks like a block but not solid, made from dots).
From another IIe, I tried swapping out all available socketed chips
but it did not resolve the problem. There are still quite a few I
would not be able to swap out without desoldering them.
Does anyone know the IIe well enough to determine which chip, cap or
resister may be fried?