Quote:
Originally Posted by SiriusHardware
Sorry to have to suggest this, but it may be worth taking the 8255 out just to make sure that pin 1 is not folded over. Still happens to me from time to time, even now.
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And ... also check the IC socket pins arent folded under, and soldered correctly.
You can normally check for this type of fault with torch and magnifier.
Good luck.