I have been working on one of the original ][e computers (white keys).
There are several keys that just will not register no matter what I have done.
Here is a list of what I have done.
I have replaced all the ][e enhancment chips - which someone else put in, with the original chips.
Replaced keyboard rom
Replaced memory with new
Replaced keyboard with known good keyboard
Re-flowed solder on the back of keyboard connector and checked for cold solder and traces
Cleaned keyboard connector pins
Still have the same characters not responding.
Is there something I am missing?