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IBM PC XT 5160 BIOS versions

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  • fs5500
    replied
    This is screenshot of System Information for PC-TOOLS on IBM PC XT 5160

    5160-0.png
    5160-1.png
    5160-2.png
    5160-3.png

    Leave a comment:


  • Moogle!
    replied
    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.

    Leave a comment:


  • Chuck(G)
    replied
    IIRC, won't most 27256-type EPROMs work? Why an OTP one?

    Leave a comment:


  • Moogle!
    replied
    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.

    Leave a comment:


  • SomeGuy
    replied
    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).

    Leave a comment:


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

    Leave a comment:


  • VERAULT
    replied
    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.

    Leave a comment:


  • framer
    replied
    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

    Leave a comment:


  • fs5500
    replied
    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)

    Leave a comment:


  • modem7
    replied
    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].

    Leave a comment:


  • nc_mike
    replied
    If I can get a PC/XT 256-640K system board that on the backside says "YB 620-6181655-01 94V-0 Rev 1 date on bio chips is 1981,85", 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?

    Regards,
    Mike

    Leave a comment:


  • fs5500
    replied
    Hi.

    I think "5000026" (08/16/82) ROM version.
    Before this, I've checked dumped of other IBM PC 5150 (Revision 3, 10/27/1982) and IBM PS/2 Model 25 (Revision 1, 06/26/87)

    I found that ROM of IBM PC 5150 Revison 3 exists as 2 kinds. (One is copyrighted 1981, another is 1982)
    Also ROM of IBM PS/2 Model 25 Revision 1 exists at least 2 kinds. (One is 00F2092, another is 00F2122)

    So I'm sure "5000026" ROM is not fake. (At least this must be prototype or beta, not for retail)
    But it is not only verified if this ROM is exist or not.
    I've checked checksum of 8KB.
    Checksum is correct as 00h.

    IBM should replace ROM chip of "5000026" with "1501522", but the reason is unknown.

    The more interesting thing is that BIOS data of IBM XEBEC HDC (5000059) is also same "08/16/1982"
    Last edited by fs5500; February 13, 2013, 05:04 AM.

    Leave a comment:


  • per
    replied
    Originally posted by nestor View Post
    I read the bios chip of one vga card and my willem corrupted the EPROM! The contents of the backup file and the eprom after reading it were different. I flashed the backup file to a 27C512 eprom and the vga card worked again.

    Don't trust the willem readers, they are not the most reliable!
    When it comes to BIOS files, you can just dump them using simple software routines.

    When I dump other ROM chips, I allways use a card with a BIOS-extension ROM socket on it. For general 27xxx chips, I use some ethernet card, and for the more uncommon 8KB chips used in the early PC's, I use the ROM socket on the IBM HDD controller.

    Leave a comment:


  • nestor
    replied
    Originally posted by neazoi View Post
    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???
    I read the bios chip of one vga card and my willem corrupted the EPROM! The contents of the backup file and the eprom after reading it were different. I flashed the backup file to a 27C512 eprom and the vga card worked again.

    Don't trust the willem readers, they are not the most reliable!

    Leave a comment:


  • modem7
    replied
    Originally posted by neazoi View Post
    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???
    Some possibilities:
    * You've inserted the ROMs in the wrong orientation/direction.
    * You've put the U19 ROM into the U18 socket, and the U18 ROM into the U19 socket.
    * Whilst inserting the ROMs, one or more pins have become bent.

    Leave a comment:

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