Hi.
I got this '88 Model M with what I think is a 180-degree DIN plug.
The cable is detachable and the keyboard plug looks like a regular SDL plug:
I have loads of SDL-PS/2 cables around from my other Model Ms (even spare ones) and my motherboard (ASRock Z270 Taichi) has a PS/2 port. I am wondering if using one of those SDL-PS/2 cables on this keyboard would work.
I did not test it because I am afraid of blowing up the controller or the motherboard.