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Model F keyboard
The Model F was a series of computer keyboards produced from 1981–1994 by IBM and later Lexmark.〔http://deskthority.net/wiki/IBM_Model_F〕 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 made its debut with the IBM System/23 Datamaster all-in-one computer. However, it is best known for its release with the IBM Personal Computer in 1981, and its subsequent release with the IBM 5170, where it was reconfigured with the AT protocol and some layout revisions.〔http://deskthority.net/wiki/IBM_Model_F#IBM_System.2F23_Datamaster_Keyboard〕
The capacitive design is widely considered superior to that of the later membrane design used on the Model M. It has a lighter actuation force of about 60g, a crisper feel and louder feedback, and is more robust. It also has a higher MTBF of over 100 million keypresses, and full n-key rollover.
==Variations==
Many IBM keyboards were based on Model F technology, featuring different keycaps, layouts and connections:
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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