PROBLEM DESCRIPTION: The extended 80-column card does not
work at all in one Apple IIe but installing it into another Apple IIe
solves the problem. This looks like a problem with the original
Apple IIe's motherboard but it isn't.
CAUSE: The 80 column card may be at fault.
CURE: 1. Before you swap motherboards (an expensive proposition),
try changing the 74LS245 chip on the extended 80-column card
(listed in the price pages).
2. If step 1 didn't work, replace the 80 column card.
3. Replace the motherboard in the original Apple IIe.
If the above cure doesn't fix the problem, refer to the Technical
Procedure for the Apple IIe's troubleshooting procedure.