It is odd that you only seem to get a response form the CTRL and BRK keys. Although looking at the schematic just now I realize that the keys Brake, caps, num, code, grph, ctrl and shift are all strobed by PBO all other keys are strobed by PA0-7. Ports PA and PB both come from the 8155. Both ports are also used by the LCD so if the LCD is working then PA is working.
Just for giggles you might turn off the memory battery switch, let it set 10 minutes and then turn it back on. This should clear all the RAM. Then turn it back on and try a hard reset again. Jeff Birt -----Original Message----- From: M100 <[email protected]> On Behalf Of Matthew Walworth Sent: Monday, April 19, 2021 8:55 PM To: [email protected] Subject: [M100] Dead Keyboard Hello All, I dragged my T102 out of the closet a few days ago. It fired right up, but the keyboard seems to be dead. It was working fine when I had it out last about 4 or 5 years ago and in fact appeared to have a couple of files left on it that I had been playing with. I opened it up expecting to maybe find that the backup battery had leaked but everything inside looks very clean. I put some batteries in and let it sit overnight plugged in but still no go. I tried a cold restart and that worked which leads me to believe that the keyboard must be being read to some extent since it detected that the ctrl and pause keys were pressed. Does anybody have any suggestions as to what I should do next as far as diagnosing the problem? I have a multimeter but no scope or logic probe. Any suggestions are appreciated. ...matthew...
