My first guess would be a damaged I/O pin on the 7I92H (so marginal levels)
BTW, a good way to check for I/O pin damage is to check the input protection
diodes with an Ohmmeters diode check function (positive lead to ground, negative
lead to I/O line)
All lines should show a consistent ~0.6V diode forward voltage drop
Most pin damage comes from mismatched ground levels which typically
overcurrent the input protection diodes.
Peter Wallace
Mesa Electronics
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