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 capacitive PCB, similar to the later Model M keyboard that used a membrane in place of the PCB. The Model F first appeared with the IBM System/23 Datamaster all-in-one computer.
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 capacitive PCB, similar to the later Model M keyboard that used a membrane in place of the PCB. The Model F first appeared with the IBM System/23 Datamaster all-in-one computer.
Source: Wikipedia "Model F keyboard" · CC BY-SA 4.0
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