I have a '99 that I fitted with a F18a some months back. I've used it a good many hours without issue, and some of that was online through TIMXT with a WiFi232 -- so the keyboard has been working fine.
I'd not used the TI in a few weeks and turned it on and noticed in the FlashROM '99 menu that certain keys were not working. Those keys are:
HJKL; and SPACE
Press normal, hard, etc. and they don't register -- TI BASIC, TIMXT, Forth, etc. But, I left the machine on for a while and I notice they keys now do work...but you need to press them just a little harder than "normal" for them to trigger, and when you do, they usually repeat a few times. One depress of 'K' results in 'KKKK' and such. So something is really strange here.
I assume the hardware heating up is the change, but the repeat action baffles me. Can anyone make anything out of this? I see no other oddities with the system. I disconnected my PEB and that had no effect on the situation.
Is this a specific IC failing? Or...? Thanks.