deskthority

Measuring capacitors with a multimeter set to measure resistance can give some interesting results, especially depending on how your multimeter operates. Capacitors react rather differently to AC, and many multimeters can actually apply a pulsed signal which is AC-enough to cause stuff you might not expect. You need a much fancier device in order to measure ESR (equivalent series resistance) in a capacitor, and to get a trustworthy result you really want to disconnect it from the circuit.

That original controller looks spotless, and they are pretty damned robust so I hope it works out for you

I just got the Blue Cube and the keyboard works, so it was indeed a power problem!
For future reference, I'm using a Asrock H77 Pro4/MVP motherboard and it apparently doesn't deliver enough power over the PS/2 connector for an AT Model F, a Blue Cube does work with this keyboard.

Sorry for the trouble I caused and many thanks for all the help.

Happy you got it working ! Blue cube is where its at, hmm I don't know why newer PS/2 ports don't deliver the power, i am almost sure the IBM will be within the spec of AT/PS2 you know considering IBM designed the standard pretty much. Newer motherboards being out of spec ,lazy b*****ds.

They just have it as another tick for the feature checklist. You're not supposed to actually use one…

Somehow it makes me want to go back to the old days when a motherboard was a just a bus with a CPU and memory on it. Or a PDP-11 with nothing on the backplane