Model M keyboard
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Model M keyboards are a group of computer keyboards designed and manufactured by IBM starting in 1985, and later by Lexmark International, Maxi Switch, and Unicomp. The keyboard's different variations
An IBM Model M manufactured in the early 1990s
Unicomp Model M with removed "z" key. The buckling spring is visible.
Keycap in a French Model M
IBM Model M2, Part no. 1395713, manufactured 1992
Model F keyboard
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The Model F was a series of computer keyboards produced mainly from 1981–1985 and in reduced volume until 1994 by IBM and later Lexmark. Its mechanical-key design consisted of a buckling spring over a
Model F capacitive pads from an opened assembly
Corrosion occurring on a Model F 122 terminal keyboard along with dust
A comparison between a Model F spring (left) and a Model M spring (right); the Model M uses a spring with fewer windings and smaller plate for the plastic membrane underneath.
IBM Model F 122 key Keyboard