Oleg Zabluda's blog
Friday, July 21, 2017
 
"""
"""
The Model F was a series of computer keyboards produced from 1981–1994 by IBM [...]. Its mechanical-key design consisted of a buckling spring over a capacitive PCB, similarly to the later Model M that used a membrane in place of the PCB.

The Model F first appeared with the IBM System/23 Datamaster all-in-one computer. It is best known as part of the IBM Personal Computer in 1981 with some keycap label differences, and its subsequent release with the IBM 5170, where it was reconfigured with the AT protocol and some layout revisions.[2][3]

The capacitive design is widely considered superior to that of the later membrane design used on the Model M
"""
https://en.wikipedia.org/wiki/Model_F_keyboard
https://en.wikipedia.org/wiki/Model_F_keyboard

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