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Thread: IBM PC XT (5160) Keyboard Connection

  1. #1
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    Default IBM PC XT (5160) Keyboard Connection

    Can you use a PS/2 Model M on a PC XT if you have a PS/2 to DIN5 Adapter or wont the XT recognize it?
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    Unless your adaptor does something extraordinary, no.

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    Wasn't there some discussion that some Model M's could do XT protocol?

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    Yes, I have a Model M # 1390120, Date, 06 FEB 86 and it's XT/AT compatible.
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    Keyboard support for the IBM 5160 discussed at [here].

  6. #6

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    Most U.S.-made, IBM-branded Model M keyboards are XT/AT autoswitching. The later Lexmark, Maxi-Switch, IBM Greenock Scotland, and Unicomp Model Ms are probably all AT-only.

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    Quote Originally Posted by vwestlife View Post
    Most U.S.-made, IBM-branded Model M keyboards are XT/AT autoswitching. The later Lexmark, Maxi-Switch, IBM Greenock Scotland, and Unicomp Model Ms are probably all AT-only.
    I have a 1987 UK-made Model M and it is AT only, no autoswitching. However, I have seen UK 5160s sold with model M keyboards so presumably some are compatible. Unless they held a small stock of US PCBs to sell as upgrades for XTs (and presumably 5150's too?) and did a main run of AT-only boards for 5170s and PS/2s.

    I could've sworn I read somewhere that late-model XTs with the final BIOS revision did have hardware support for the AT protocol and could use any AT keyboard, but can't see that anywhere now. Perhaps I imagined it!

    What is actually different about the PCB in the autoswitchers? Just a different IC with support for both protocols or an entirely different board?

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