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Thread: IBM PC XT 5160 BIOS versions

  1. #21
    Join Date
    May 2006
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    Melbourne, Australia
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    Quote Originally Posted by nc_mike View Post
    would that board have the latest 4/86 BIOS that supports the 101 keyboards, and if not, can the BIOS be upgraded/flashed using a diskette?
    Both questions are answered at [here].

  2. #22

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    I've tested with BIOS (08/16/82) on 5150 machine. (Of course IBM PC 5150/5160 emulator.)

    It works well.

    I think this BIOS is for IBM PC 5150 than 5160.

    I've run PC-Tools on 5160 machine configulation with this BIOS.

    The result is on screenshot.



    According to PC-Tools, it recognize as IBM PC (Not IBM PC XT)

    But PCTools recognize as IBM PC-XT correctly on BIOS (11/08/82)


  3. #23
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    Nov 2008
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    Portsmouth RI
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    Just looked at the 5160 MB that I replaced the 12v line caps on.

    This is a IBM 256 - 640 system board

    U18 = 62x0890
    U19 = 68x4370
    dated 1986 no month shown

    Chips stamped IBM

  4. #24
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    Jan 2012
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    can I upgrade my 5160 XT (256KB board) to accept the new bios which supports 720K and 1.2mb disk drives? What is involved? Right now I have to use a card with onboard bios to utilize a 1.44 drive.

  5. #25

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    I'm wondering if it's possible to "upgrade" a clone PC-XT by changing its ROM chip for an IBM one ?

  6. #26
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    Many generic ERSO style XT clones will happily accept IBM ROMs so people could add IBM BASIC. But not all clones are that hardware compatible. Doing that may not work at all or lose smaller features that were added to later clone BIOSes (For example, commonly in turbo 8-mhz 8088 boards you can lose keyboard turbo switching).

  7. #27
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    For anyone interested, I want to confirm that the ATMEL AT27C256R-45 One Time Programmable is compatible with the IBM 5160 64K-256K motherboard using the Mostek MK38000, though the machine does not benefit from the faster ROM as far as I can tell. The November 8th, 1982 BIOS was tested.

  8. #28
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    IIRC, won't most 27256-type EPROMs work? Why an OTP one?

  9. #29
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    Dec 2008
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    As suggested by this list on Minus Zero Degrees, there is at least one that does not. The chips I mentioned in my previous post were just what I had on hand. Mouser sells them.

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