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Thread: IBM PC XT 5160 - Early version

  1. #11
    Join Date
    Dec 2010
    Location
    Seattle, WA
    Posts
    1,837

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    If you're lucky it will be worth as much to someone as a prototype Commodore 264. Guess we'll find out.

    http://www.ebay.com/itm/151804412825

  2. #12

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    What would be very interesting is to find out what date is stamped in the back of the front cover of this machine. From that we can get a slight indication of how fast the first production XTs were assembled, but also in what order things got sorted out.

    What is intriguing is to see that the 5000026 is datecoded 4th week of 1983, while my 1501512 is datecoded 5th week of 1983. That's a really small difference, and this can only mean that they changed to producing the new BIOS in the end of January 1983. I will guess they used the 5000026 in the earliest of the early machines to save production time.

    If my assumption that the restamping of the motherboard product number in my machine indicates the newer BIOS, then it (and all first-run XTs) must have been intended to have the 5000026 initially. Depending on when your machine was assembled, it might have been put together before BIOS chips were produced at all, and the secondary BIOS chips might have been installed as soon as they arrived from factory.

    As my machine has serial number 0010472, it's pretty safe to assume that between 5000 and 10000 of the first XTs came with the 5000026. Now, the thing is that your machine and mine are the only two first-run XTs I have ever seen so any first-run XT is a pretty rare sight.

    PS. there were patch-wires on expansion-cards in my machine as well, so yes IBM did actually ship computers with these sort of fixes.
    Current systems owned by me:
    Vintage:IBM PC/XT submodel 087 ( 1983 ), [Kon]tiki-100 rev. C (1983), Compaq Portable I ( 1984 ), IBM PC/XT submodel 078 ( 1985 ), IBM PC/XT286 ( ~1986 ), 3x Nintendo Entertainement Systems ( 1987 ).
    Obsolete:Commodore A500 ( ~1990 ), IBM PS/2 model 70/386 type 8570-161 ( 1991 ), Atari Lynx II ( ~1992 ), Generic Intel 486SX PC ( ~1993 ), AT/T Globalyst Pentium w/FDIV bug MB ( 1994 ), Compaq 486DX4 laptop ( ~1995 ).

  3. #13

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    Tyler: We need a dump of your 500026 ROM chip so the MAME team can confirm or refute whether their contents match.

  4. #14

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    I think IBM PC XT 5160 Early version with 5000026 BIOS seems to be very rare than IBM PC 5150 Early version with 5700051.

    The following onwers seen to have IBM PC XT 5160 Early version on vcfed.
    (L/N -- Lot No. , P/N -- Part No. , S/N -- Serial No.)


    1)Motherboard with 5000026 BIOS (P/N : 1501491)

    *fs5500 (2ea - L/N : 1612, L/N : 3023) -- All L/N of BIOS chips are 8251 (S/N on 5160 case : ??????? , I don't have IBM PC 5160 case)
    *MicroCoreLabs (1ea - L/N : ????) -- L/N of BIOS chip is 8304 (S/N on 5160 case : ????????)
    *Tyler Durden (1ea - L/N : 4073) -- L/N of BIOS chip is 8304 (S/N on 5160 case : 0005886)


    2)Motherboard with 1501512 BIOS (P/N : 1501490)

    *per (1ea - L/N : 4103) -- L/N of BIOS chip is 8305 (S/N on 5160 case : 0010472)
    Last edited by fs5500; September 11th, 2019 at 03:01 PM.

  5. #15
    Join Date
    May 2006
    Location
    Melbourne, Australia
    Posts
    6,307

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    Quote Originally Posted by fs5500 View Post
    1)Motherboard with 5000026 BIOS (P/N : 1501491)

    *fs5500 (2ea - L/N : 1612, L/N : 3023) -- All L/N of BIOS chips are 8251 (S/N on 5160 case : ??????? , I don't have IBM PC 5160 case)
    *MicroCoreLabs (1ea - L/N : ????) -- L/N of BIOS chip is 8304 (S/N on 5160 case : ????????)
    *Tyler Durden (1ea - L/N : 4073) -- L/N of BIOS chip is 8304 (S/N on 5160 case : 0005886)
    When member MicroCoreLabs posted photos of his set, I noticed that his set (both the 5000026 and 5000027 chips) had markings/scratches that matched with Tyler's set. It was particularly noticeable for the 5000027 chip - see [here]. When I then queried MicroCoreLabs, he agreed that his set was the same.

    BTW. If you email to me, a photo of your second 5000026/5000027 set, I will add it to [here].

  6. #16

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    @modem7

    Sure.

    https://mega.nz/#!S01yUKpI!hRLtOolcb...SejXRHOrHFteQQ

    Total size is 267MB.

    I fixed the information.

    1)Motherboard with 5000026 BIOS (P/N : 1501491)

    *fs5500 (2ea - L/N : 1512, L/N : 3023) -- All L/N of BIOS chips are 8251 (S/N on 5160 case : ??????? , I don't have IBM PC 5160 case)
    *Tyler Durden (MicroCoreLabs) (1ea - L/N : 4073) -- L/N of BIOS chip is 8304 (S/N on 5160 case : 0005886)


    2)Motherboard with 1501512 BIOS (P/N : 1501490)

    *per (1ea - L/N : 4103) -- L/N of BIOS chip is 8305 (S/N on 5160 case : 0010472)
    Last edited by fs5500; September 11th, 2019 at 09:22 PM.

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