Electronic – What connector did this IBM Model M keyboard have

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I got got hold of an old IBM Model M (Model 1391403, to be precise). Unfortunately, the fixed cable was cut off by an unknown idiot.

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Does anyone know what kind of connector (I assume PS/2?) was supposed to be at the other end, and what pins the colors correspond to?

Best Answer

Here is the pinout you need:

  • +5 V - black
  • data - red
  • clock - yellow
  • ground - white
  • ground/shield - silver

That black as +5 V is not what you would call industry standard and if you salvage a PS/2 (mini-DIN) or DIN cable elsewhere, be sure to match the pinout and not the colors.

Here is a pinout for both DIN and mini-DIN enter image description here

Ready-made cables for the very purpose are sold online too: Cable

(Side note: I wrote in a comment above that it existed with both mini-DIN and DIN. This may have not been 100 % accurate. My old PS/1 (or was ut just called personal system?) came with bucking coil keyboard and PS/2 connector which was very similar but more compact than an actual and original model M.)

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