Electronics > Repair
Pinball CPU data lines pulled up to 1.2V
drhex:
Ok, CPU socket had an issue R/W didn‘t make contact. I hate boards someone has worked on before. More there, still not running right. :-(
drhex:
And found another corroded through data line in the end. That killed a few bus drivers but left CPU/RAM/ROM working. Board is now OK as far as I can test.
Now left with a conundrum with the original PAL chip - it works but any "new" ones I am burning don't. TIBPAL16L8 and NS PAL16L8 seem to be the same thing though so don't know why. Have read the original and used the files available on the net. Must be missing something along data levels or such.
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