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IBM PC XT 5160 BIOS versions

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    IBM PC XT 5160 BIOS versions

    According to:
    1. Various editions of Upgrading & Repairing PC's (Scott Mueller)
    2. BIOS listing for 01/10/86 version
    3. ROMs in possession
    4. IBM's Technical Reference for the 5160
    5. Internet sources
    6. Contributions from forum members


    -------------------------
    08/16/82
    -------------------------
    Not much information on this BIOS.
    Mueller's 'Upgrading & Repairing PCs' book doesn't list it, but some other sources do.
    There is a dump of part of BIOS on the Internet. The date string within it is "08/16/82" and the copyright string within it is "5000026 COPR. IBM 1982"

    ROM SIZE = 40K
    ROM U18 = 32K chip labeled with IBM part number of 5000026
    ROM U19 = 8K chip labeled with IBM part number of 5000027 (reused in the next BIOS - dated 11/08/82)

    U18 contains the actual BIOS plus part of BASIC. U19 contains the remainder of BASIC.

    It is possible that this BIOS did not make it into the 5160s released to the public.
    If it did, there can't be too many about because this BIOS was replaced three months later (11/08/82).

    Question: Does the source code for it appear in the first edition of IBM's Technical Reference for the 5160?
    Question: Does anyone actually have a "5000026" stamped chip?


    -------------------------
    11/08/82
    -------------------------
    ROM U18 = 32K chip
    ROM U19 = 8K chip
    KNOWN ROM SETS = U18=1501512/U19=500027 or U18=1501512/U19=6359116
    ID/SUBMODEL/VERSION = FE/--/--
    * Used on 64/256K motherboards.
    * "The original XT BIOS had all of the features of the latest 10/27/82 PC BIOS."

    Memory map:
    . = unused
    b = ROM BASIC
    R = ROM BIOS
    ------: 0---1---2---3---4---5---6---7---8---9---A---B---C---D---E---F---
    0F0000: ........................bbbbbbbbbbbbbbbbbbbbbbbbbb bbbbbbRRRRRRRR
    ------: ........................|< U19 >|<----------- U18 ------------->|


    -------------------------
    01/10/86
    -------------------------
    ROM SIZE = 64K
    ROM U18 = 32K chip
    ROM U19 = 32K chip
    KNOWN ROM SETS = U18=62X0851/U19=62X0854 (PROM) or U18=62X0852/U19=62X0853 (EPROM)
    ID/SUBMODEL/VERSION = FB/00/01
    * Used on 256/640K motherboards. Up to 640K RAM.
    * Enhanced POST (one known enhancement is a faster test of RAM).
    * Added support for the 101-key Enhanced keyboard. (Note: Some later released 101-key enhanced keyboards dropped support for the IBM 5160.)
    * Support for 720K floppy drives. Support for 1.2M floppy drives. (Note: 1.2M drives also require a 1.2M compatible floppy controller.)

    Memory map:
    . = unused
    b = ROM BASIC
    R = ROM BIOS
    ------: 0---1---2---3---4---5---6---7---8---9---A---B---C---D---E---F---
    0F0000: RRRRRRRRRRRRRRRRRRRRRRRRbbbbbbbbbbbbbbbbbbbbbbbbbb bbbbbbRRRRRRRR
    ------: |<----------- U19 ------------->|<----------- U18 ------------->|


    -------------------------
    05/09/86
    -------------------------
    ROM SIZE = 64K
    ROM U18 = 32K chip
    ROM U19 = 32K chip
    KNOWN ROM SETS = U18=59x7268/U19=62x0819 (EPROM) or U18=62x0890/U19=68x4370 (PROM)
    ID/SUBMODEL/VERSION = FB/00/02
    * Contained some fixes for minor keyboard bugs related mainly to the enhanced keyboard.

    Memory map:
    . = unused
    b = ROM BASIC
    R = ROM BIOS
    ------: 0---1---2---3---4---5---6---7---8---9---A---B---C---D---E---F---
    0F0000: RRRRRRRRRRRRRRRRRRRRRRRRbbbbbbbbbbbbbbbbbbbbbbbbbb bbbbbbRRRRRRRR
    ------: |<----------- U19 ------------->|<----------- U18 ------------->|

    Last edited by mbbrutman; December 31, 2017, 10:50 AM. Reason: Marked the 62X0852/62X0853 set as 'EPROM'

    #2
    Originally posted by modem7 View Post
    According to:
    * The original XT BIOS had all of the features of the latest 10/27/82 PC BIOS.
    The XT BIOS doesn't have the cassette I/O support that the PC BIOS has.

    Originally posted by modem7 View Post
    According to:
    ROM U19 = 4K chip labeled with IBM part number of 5000027
    It's actually 8K I think...
    Last edited by per; February 15, 2008, 10:55 AM.
    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 ).

    Comment


      #3
      Originally posted by per View Post
      The XT BIOS doesn't have the cassette I/O support that the PC BIOS has.
      It's actually 8K I think...
      Although technically correct I always thought each ROM was 4k and since IBM had a HI & LOW rom you ended up with 8k total between the 2.

      Comment


        #4
        The XT BIOS doesn't have the cassette I/O support that the PC BIOS has.
        "The original XT BIOS had all of the features of the latest 10/27/82 PC BIOS" is a quote from the 8th edition (and others) of Mueller's 'Upgrading & Repairing PCs'.
        One mustn't read too much into that. So I wouldn't expect cassette support to be in an 5160 BIOS because the 5160 lacks cassette hardware.
        Likewise, I wouldn't expect to see any code that attempts to read two switch blocks.

        It's actually 8K I think
        40-32=8 How did I end up with 4 ? I've just replaced the batteries in my calculator, so it doesn't happen again.
        Thanks for picking up my mistake. I've corrected the post.

        Comment


          #5
          Although technically correct I always thought each ROM was 4k and since IBM had a HI & LOW rom you ended up with 8k total between the 2.
          You're thinking of the AT. Two ROMs each supplying 8 data bits for a 16 bit data bus.

          Comment


            #6
            Originally posted by modem7 View Post
            According to:
            -------------------------
            01/10/86
            -------------------------
            ROM SIZE = 64K
            ROM U18 = 32K chip labeled with IBM part number of 62X0851
            ROM U19 = 32K chip labeled with IBM part number of 62X0854
            In case you're interested in another data point, I have a motherboard with
            62X0852.U18 and 62X0853.U19. But their contents are the same as the ones
            listed in your post for 10JAN86.

            Bill
            Last edited by wrljet; May 23, 2010, 08:59 AM. Reason: typo misspelling

            Comment


              #7
              Thank you Bill for your contribution. I've amended the first post.

              Comment


                #8
                Originally posted by wrljet View Post
                In case you're interested in another data point, I have a motherboard with
                62X0852.U18 and 62X0853.U19. But their contents are the same as the ones
                listed in your post fr 10JAN86.

                Bill
                Are the checksums of the contents (and not just the bios date) the same as the other ones?
                CRC32 Checksums should be:
                62x0851 = 1054f7bd
                62x0854 = b5fb0e83

                If the checksums are not the same, I'd be interested in seeing what the differences are.

                LN

                Comment


                  #9
                  Originally posted by Lord Nightmare View Post
                  Are the checksums of the contents (and not just the bios date) the same as the other ones?
                  CRC32 Checksums should be:
                  62x0851 = 1054f7bd
                  62x0854 = b5fb0e83

                  If the checksums are not the same, I'd be interested in seeing what the differences are.

                  LN
                  The entire contents of the ROMs are identical, byte for byte.

                  Bill

                  Comment


                    #10
                    All models of the XT use the same basic board. You can upgrade from a 11/08/82 to a 05/09/86 BIOS merely by replacing the ROMS/EPROMS. This would suggest that the U19 ROM/EPROM is actually a 32K chip with only 8K used. Otherwise, how does the board deal with the two extra address lines when an 8K chip is installed?
                    My Retro Computing and Vintage Gaming Blog : http://nerdlypleasures.blogspot.com/

                    Comment


                      #11
                      Originally posted by Great Hierophant View Post
                      All models of the XT use the same basic board. You can upgrade from a 11/08/82 to a 05/09/86 BIOS merely by replacing the ROMS/EPROMS. This would suggest that the U19 ROM/EPROM is actually a 32K chip with only 8K used. Otherwise, how does the board deal with the two extra address lines when an 8K chip is installed?
                      Mine, 62X0853.U19, has about a 16K hole in it. Starts about 1D38 and ends at 5FFF.

                      It also contains the string 62X0854 at the beginning.

                      Bill

                      Comment


                        #12
                        Originally posted by Great Hierophant View Post
                        Otherwise, how does the board deal with the two extra address lines when an 8K chip is installed?
                        The 8Kb of the 8K EPROM will repeat 4 times through the 32Kb a 32k EPROM would appear in. Half of the BIOS (early revision) does this, and you can easily see it in Debug; Just type:

                        Code:
                        D F000:0000
                        D F000:2000
                        D F000:4000
                        D F000:6000
                        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 ).

                        Comment


                          #13
                          hello I have an original IBM XT board and when it boots it gives an 601 floppy error because I have not put an original floppy controller. I have read that on other versions of bios this does not happen so I would like to reprogram the bios and basic chips.
                          are there any bin/hex/rom files for these so I can reprogram my motherboard?

                          Comment


                            #14
                            Originally posted by neazoi View Post
                            hello I have an original IBM XT board and when it boots it gives an 601 floppy error because I have not put an original floppy controller. I have read that on other versions of bios this does not happen so I would like to reprogram the bios and basic chips.
                            are there any bin/hex/rom files for these so I can reprogram my motherboard?
                            Gosh! I tried to read the bios and basic chips using my willem eprom reader and I kept a backup file.
                            Now I re-insert the original chips on the motherboard and it does not boot! what should I do???

                            Comment


                              #15
                              Originally posted by neazoi View Post
                              hello I have an original IBM XT board and when it boots it gives an 601 floppy error because I have not put an original floppy controller. I have read that on other versions of bios this does not happen so I would like to reprogram the bios and basic chips.
                              That is a known issue for the IBM AT (IBM 5170). Where did you read that it happens on the IBM XT (IBM 5160) ?

                              Comment

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