Imagine having a PC122 and a 49-key hooked into the same machine.
IBM Model M’s are glorious.

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Imagine having a PC122 and a 49-key hooked into the same machine.
IBM Model M’s are glorious.

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I figured it was about time I tested my Model M PC122 keyboards. They use the standard PS/2 protocol, but they use irregular 5-pin DIN connectors. The standard AT connector uses a 180 degree pin spacing, but the PC122 uses 240 degree pin spacing. So I wired one into a PS/2 connector and all is well.
Initial tests on my Windows 95C desktop show that both my keyboards allow me to type about 80% of the common keys. Some alphanumerics or common symbols don’t work, and the oddly marked keys don’t seem to do anything, or whatever they do isn’t immediately obvious. Not bad, considering I haven’t installed drivers for it on the 95C machine. Not sure where I’d get any -- I’ll try it on more modern hardware next.
The key marked ‘print’ immediately types a time stamp -- COOL! I’ve never seen such a feature, but now that I think about it, that’s mighty useful. I want to try using this keyboard as a daily driver at some point, but that won’t be any time soon.