XE & XL keyboard troubles
Hi all,
I've been getting my 8bits back in operation and run into some troubles with keyboards. I first dug out my 130XE and hooked it up, both 1050's work fine but the keyboard was getting flakey some keys weren't working like 1, 2, Q and some others that were not grouped together. I replaced the mylar with one I got from best and it improved marginally, more keys are working except HELP, SELECT, START, OPTION aren't working so well, SELECT & OPTION being the worst off. Suddenly this
This is for the XE computers.
It is best not to rub the mylar's traces, that oxidation protects what is left of the traces, if you clean them all it exposes fresh
materials to oxidize causing the whole thing to repeat. As was evidenced, new old stock mylar did not correct the problem.
The amount of resistance to decrease in this case looks to be quite minimal as the keys are at the borderline.
A target combination equal to 220 ohm should be safe.
Do not disturb the 47k resistor (yell