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
IBM Model F AT not working - LEDs light up on start up
- Nuum
- Location: Germany
- Main keyboard: KBD8X Mk I (60g Clears), Phantom (Nixdorf Blacks)
- Main mouse: Corsair M65 PRO RGB
- Favorite switch: 60g MX Clears/Brown Alps/Buckling spring
- DT Pro Member: 0084
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.
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.
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- Location: UK
- Main keyboard: Filco ZERO green alps, Model F 122 Terminal
- Main mouse: Ducky Secret / Roller Mouse Pro 1
- Favorite switch: MX Mount Topre / Model F Buckling
- DT Pro Member: 0167
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.
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- Location: UK
- Main keyboard: Filco ZERO green alps, Model F 122 Terminal
- Main mouse: Ducky Secret / Roller Mouse Pro 1
- Favorite switch: MX Mount Topre / Model F Buckling
- DT Pro Member: 0167
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