More pics
Spoiler:
Keyboard One:
Spoiler:
top is f xt
cleaned up real nice
4429669 8130
Z0 P A 866411
Intel '77
L1324455
8273565
IBM 9314
1 F25 2260
561 6646...
BP 870976TS
X 8301 S MALAYSIA
158 2604
0G 851380
8246EG SINGAPORE
Spoiler:
Spoiler:
the feet in second one have metal screw into insert like so
but the other one i twist real hard and doesnt go
good as new - -
but the other one i twist real hard and doesnt go
good as new - -
Spoiler:
The goal is to remove the Secondary PCB and convert the keyboard by interfacing with the Primary PCB (the one with all the keys and the Intel chip).
Here is what I have mapped out of the original pcbs so far (open image in new tab to zoom in):
I am guessing this is 8-bit parallel output; that bigger chip on Secondary PCB probably just inverts them or something. But so far I can't get it to output anything. In fact, the controller is usually not even scanning the keys. Presumably I need to do something with pins Orange and Babyblue. Maybe some kind of clock? It would be epic if the chips had any useful markings.
I tried powering mystery driver chip directly with 5v but it just holds pins Orange and Babyblue high.
Update
Great info at:
http://www.bitsavers.org/pdf/ibm/system ... _Dec80.pdf
http://bitsavers.trailing-edge.com/pdf/ ... _May82.pdf
explains the mystery pins.
Made some progress but lost motivation - the service manual implies that the original brain makes it so that some keys can't be held, some are "typamatic", etc.
Instead I rebrain with new QMK xwhatsit controller:
Put in a solenoid too because no keyboard is ever loud enough
Update 2023-06-17: restored and converted. Added more pics everywhere