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IBM PC AT 5170 BIOS versions

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  • fs5500
    replied
    I found another EPROM chip with P/N for IBM PC 5170 (Type 1) on eBay.

    U17 -- P/N : 6448894
    U27 -- P/N : 6480084
    U37 -- P/N : 6448895
    U47 -- P/N : 6480085

    https://i.ebayimg.com/images/g/eCUAA...fT/s-l1600.jpg
    https://www.ebay.com/itm/224368049783

    I'm sure this is for BIOS Rev.2 (06/10/85) for Type 2 motherboard normally.
    But this is already adapted on Type 1 motherboard.IBM5170V2-1.jpg

    Leave a comment:


  • pkhoury
    replied
    Thank you Stone. Next is the conundrum of running it. The machine only has 2 5.25" floppies (probably high density). I have 2 of these and neither look like they've ever been used before, with a cut out in front of the case for a Syquest or Iomega removable drive.

    Since this is a BIOS sticky, would it be most appropriate to open up a new thread if I wanted to post pictures?

    Leave a comment:


  • Stone
    replied
    Originally posted by pkhoury View Post
    If I want to make an EPROM image, would I just read the image in an EPROM programmer, or is there another way to do it?
    Try this:

    https://www.pcorner.com/list/UTILITY/GETROM.ZIP/INFO/

    or this:

    https://www.msx.org/news/software/en/getrom-11

    Leave a comment:


  • pkhoury
    replied
    If I want to make an EPROM image, would I just read the image in an EPROM programmer, or is there another way to do it? I haven't checked my system to see what version BIOS I have (5170), but it is a tempest AT (if anyone remembers tempest). TONS of capacitors on the MFM controller and CGA card (which has additional filtering and the RCA outputs removed). Also, EVERY cable, including the power supply, is shielded. The ROMs themselves say Golden Bow up on top. One of the admins on a local vintage group I'm on really wants me to get some ROM dumps.

    Leave a comment:


  • fs5500
    replied
    @gene . @Ruud

    I recommend to discuss about non related BIOS topic on another thread.

    Leave a comment:


  • Ruud
    replied
    Originally posted by geneb View Post
    Silly question - could the unpopulated 16 bit connector positions be populated to give the AT 8 16 bit slots instead of just six?
    You could do that. But it means you cannot use 8-bits cards any more that only fit in a 8-bits slot like the original IBM CGA video card.

    Leave a comment:


  • geneb
    replied
    Silly question - could the unpopulated 16 bit connector positions be populated to give the AT 8 16 bit slots instead of just six?

    tnx.

    g.

    Leave a comment:


  • bobba84
    replied
    Thank you!

    Leave a comment:


  • fs5500
    replied
    @bobba84

    Sure, here it is.
















    @modem7

    Thanks very much.
    Last edited by fs5500; December 5, 2018, 06:33 AM.

    Leave a comment:


  • modem7
    replied
    Originally posted by fs5500 View Post
    I've got junk of IBM PC 5170 type 1 motherboard.
    This is very early Type 1 release of IBM PC 5170 BIOS.
    Part No. : 6181024 (16KB) + 6181025 (16KB) = 6181028 (32KB) , 6181026 (16KB) + 6181027 (16KB) = 6181029 (32KB)
    Good to see these chips, listed in figure 9 of the document at [here], eventually 'surface'.
    Because of the 16 KB sized ROM's, we expect shunt block U131 to be in the '27128' position (per [here]).
    Also expected, are Intel made 8259A interrupt controller chips.
    Now that we have a photo of the ROM's, I will later add details to [here].

    Leave a comment:


  • bobba84
    replied
    Wow! Can we see the entire board please??

    Leave a comment:


  • fs5500
    replied
    IBM PC 5170 BIOS.jpg

    I've got junk of IBM PC 5170 type 1 motherboard.

    This is very early Type 1 release of IBM PC 5170 BIOS.

    Part No. : 6181024 (16KB) + 6181025 (16KB) = 6181028 (32KB) , 6181026 (16KB) + 6181027 (16KB) = 6181029 (32KB)

    https://mega.nz/#!ngtklAZB!cUw4fTZlJ...ZZp8tnSY9MH9mM

    Leave a comment:


  • noobineer
    replied
    I found the answer http://www.minuszerodegrees.net/bios/bios.htm. "ROMs can be created by programming 27256 EPROMs or 27C256 EPROMs, ones rated at 150 ns (or faster)." The 27C256 I linked above are compatible. Now to learn how to use this old GTEK 7228 programmer

    Leave a comment:


  • noobineer
    replied
    I see all the information says 27256 eproms with 150ns are needed to burn the bios roms. Sources of those chips are a bit sparse. I was looking at the cmos variants "27C256" and wondered if they were compatible such as: https://www.mouser.com/ProductDetail...SI%2fRUlfO5T04.

    Leave a comment:


  • fs5500
    replied
    I've got motherboard of original IBM PC 5170 motherboard (01/10/84) and dumped it by DUMPAT.EXE.

    Then I splited dumped BIOS by using WinHex.

    Now. original BIOS of IBM PC 5170 (01/10/84) is verified perfectly.

    Leave a comment:

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