This new section could use more contributions! For starters, Russ Gilbert
The main suggestion I have is to use your A8s. This keeps the keyboard
working. I didn’t have a problem with my 800XLs, but my 1200XLs required
typing the keys a bunch to get them to respond to every keypress. USE YOUR
The problem, I suspect, is oxidation of contacts, in the keyboard, at the
cartridge slot, maybe the SIO port. Use of a soft eraser on cart edge
connector is one thing I think helps.
I would guess one could take the 1200XL keyboard apart and clean the mylar
traces with ??? 90% isopropyl alcohol and a Q-Tip. I still have my
original 800XL, it has copper switches in the keyboard, no mylar. I don’t
know what my 800s have in the keyboard, but I would guess copper switches.
My original 800XL has all socketed chips also.