I hav a set of old IBM Model-M keyboards that I really love for heavy duty typing.
One in daily use and a 2nd one as spare.
Unfortunately the one I used daily broke.
(Don't ask... They are build like a tank, but I managed anyway...)
I got the replacement keyboard from storage and found it has a very weird problem that makes it really awkward to use.
The V-key doesn't work when pressed normally. However when used in combination with Shift, Ctrl or Alt it works just fine.
All other keys on the keyboard work normally.
The hardware switch under the V-key is fine. (Else it wouldn't have worked with Shift/Ctrl/Alt either.) The tactile feel of the key and the click-action is normal too.
It can't be a software issue on the computer side as this problem occurs regardless of which computer and OS I'm using the keyboard. (Several versions of Windows and Linux on 3 different PC's and it happens on the iMac in macOS too.)
Problem is present when using the keyboard with its PS/2 connector directly or via a PS/2 to USB converter hooked up to the iMac which doesn't have PS/2. (So the PS/2 to USB converter isn't at fault either.)
I'm guessing this is a hardware problem or a firmware issue inside the keyboard.
If all else fails I can get another one, but good quality ones are becoming difficult to find and are getting expensive.
Can anyone recommend a way to fix (or at least further troubleshoot) this problem?