IBM 50 Key Keyboard

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Model M 50-keys
IBM Model M 50-key full.jpg
Part number 1395249 (printed keycaps)
1392554, 1392560 and probably others (relegendable keycaps)
Branding IBM
Manufacturer IBM
Layouts 50-key with specialized Keycap labels
Keyswitches Buckling spring over membrane
Interface PS/2
Years of production 1990

The IBM Model M 50-keys is a sub-tenkeyless matrix-layout buckling spring keyboard. Judging from the specialized keycap labels it might have been used as a cashiers keyboard or similar.

A variant exists that uses relegendable keycaps instead.[1][2]


  1. Deskthority — IBM 1392554
  2. Deskthority — An IBM M keypad that feels like an F.