IBM XT 5160 Keyboard issues

On 12/17/2016 11:14 PM, Devin wrote: Anything else alongside the 301? If it's a stuck key error then I think the firmware spits out the scancode of the offending key (although maybe that was only a 5170 and later thing?). Just a 301 on its own would indicate something more fundamental. Check the keyboard cable and connector carefully - I've seen plenty of problems with DIN-type connectors on things, and I know that at least one of my XT keyboards had damage where the cable goes into the back of the keyboard. It may be worth (carefully) taking the keyboard apart to check for obvious problems inside, and to check continuity on the keyboard cable wires (I think it's a 4-wire setup - power, ground, clock and data - although it uses a 5 pin connector with one pin unused) Check for power at the keyboard socket on the motherboard (I don't have the pinouts handy, but I'm sure that google does :-) and I believe there's a PCB-mounted fuse on the system board near to the socket which is worth a look. cheers Jules