Used a smaller connector and supported a few additional features. ![]() Keyboards and PS/2 keyboards were very similar devices, but the PS/2 device The keyboards we use today, and are the topic of this article. Next came the IBM AT system and later the IBM PS/2. The original IBM PC, and later the IBM XT, used what weĬall the "XT keyboard." These are obsolete and differ significantlyįrom modern keyboards the XT keyboard is not covered in this article. IBM introduced a new keyboard with each of its major desktop computer ![]() Even though they all use the same protocol, there are different variants, and in order to properly interface with a Model M, it is germane to understand their history. HistoryEvery Model M keyboard uses the PS/2 keyboard protocol - the Model M is in fact the original PS/2 keyboard.
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