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Thread: Mystery IBM PC/AT (ISA) Card

  1. #1

    Default Mystery IBM PC/AT (ISA) Card

    I'm hoping someone can ID this 8-bit ISA card (assuming that's what it is). I have no idea what it is or what it's for. My best guess is it's some sort of proprietary IBM interface card. That's all I know. I picked it up on eBay for 99 cents. Google doesn't turn up much of anything. As far as I know, this is the first time this thing has been posted online (other than the eBay listing.)

    Here are the photos: https://imgur.com/a/LRZMndK

    The card has what appears to be an IBM part number with some other numbers:

    42F6739
    C03448
    6260 SU

    A119Z000168 (FCC ID?)

    The external port is unlike anything I know. It has one rows of 27 female pins between two rows 26 pins for a total of 79 pins. The top of the connector is printed with "ITT (unknown symbol) 8743 2DC79SBRF-A197."

    It's a full-length card with chips from a bunch of the major foundries:

    SGS T74LS04B1
    S(?) 74LS158N
    S(?) 74LS244N
    TI SN75175N
    TI SN74LS30N
    National NS16550AN

    and four chips with copyright "IBM 1987" sticker labels:

    08F3067
    08F3273
    00F2288
    08F3028

  2. #2
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    Default

    Based on the chips (NS16550/SN75175/UA9636), it appears to be a specialised 8-port serial card.

  3. #3
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    Multi port serial card. Connector is high density like the VGA connector. It would have had a cable with eight serial connectors. Given its age it possibly had 25-way connectors but something like this:-

    https://www.ebay.com/itm/NEW-SD-PCI1...-/192367683508

    or this

    http://www.byterunner.com/byterunner...e=TC-800-550-9

    you can probably get a cable from china...
    Dave
    G4UGM

    Looking for Analog Computers, Drum Plotters, and Graphics Terminals

  4. #4
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    Default

    Given the drivers (UA9636) & receivers (SN75175), it's an 8 port RS-422 card. It might be from a Point of Sale (POS) system.

    Tom

  5. #5

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    Quote Originally Posted by modem7 View Post
    it appears to be a specialised 8-port serial card.
    Quote Originally Posted by g4ugm View Post
    Multi port serial card.
    Quote Originally Posted by hornbetw View Post
    Given the drivers (UA9636) & receivers (SN75175), it's an 8 port RS-422 card.
    Thanks for the answers!

    I figured for 99 cents why not pick it up. Might look for a breakout cable even though I have no need for 8 serial ports!

  6. #6
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    that looks like an old digiboard.

  7. #7
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    Quote Originally Posted by allCAPPS View Post
    Thanks for the answers!

    I figured for 99 cents why not pick it up. Might look for a breakout cable even though I have no need for 8 serial ports!
    It's a good buy for the 16550 chips alone, they make great replacements for 8250 serial controller chips in older cards. The 16550 has a receive data cache that allows faster serial speeds without character loss.

  8. #8

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    Quote Originally Posted by David_M View Post
    It's a good buy for the 16550 chips alone, they make great replacements for 8250 serial controller chips in older cards. The 16550 has a receive data cache that allows faster serial speeds without character loss.
    Thanks for the info. And by the way, if you're interested, I'm more than willing to part with it.

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