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can anyone identify this component

Discussion in 'Electronic Repair' started by sanjaya, May 31, 2004.

  1. sanjaya

    sanjaya Guest

    I got a card from ebay recently for apple II computer. Although seller
    claimed it is a Ethernet card for networking, i have no information
    about the card. So I am trying to go by the components to understand
    the functionality of the card. But i am stuck with a custom made IC.
    It would be great if someone can comment on it or have a datasheet.

    Innovations in Computing
    310-6206-001
    8936

    Image of the card is uploaded to www.geocities.com/pererasanjaya
    IC is in the right-middle position of the card.
    any comment is grately appreciated.
    sanjaya
     
  2. Franc Zabkar

    Franc Zabkar Guest

    The part number is "310-6206-001", and "8936" is the date code.


    - Franc Zabkar
     
  3. Gerard Bok

    Gerard Bok Guest

    What I mis from your picture is a connector :)
    The only thing I can see is a RCA-type socket next to the big IC.
    If this were an Ethernet card I would expect a 15-pin AIX
    connector at least. And possibly a 10 Base 2 coax connector.

    Does the label on the Eprom read something like SCNet ?
    Isn't that a clue ?
     
  4. Franc Zabkar

    Franc Zabkar Guest

    Despite the apparent lack of standardisation in the connector, IMO
    this could still be an Ethernet card. The DP8390CN, DP83910, and
    DP8392AN chips form an Ethernet chipset, and the Valor pulse
    transformer and Reliability 2VP12U9 DC-DC converter are typical
    Ethernet NIC parts. The unidentified 40-pin chip may be a mask ROMed
    8-bit CPU, although this would not explain the additional external
    EPROM.


    - Franc Zabkar
     
  5. Gerard Bok

    Gerard Bok Guest

    Well, today we have 'ethernet' as in the IEEE802 standard.
    Which, by the way, does include a connector description.

    But prior to that, there was a variety of other 'standards'.
    SCNet does ring a bell in that respect. As well as some
    ethernet-like system that relied on a 2.45 MHz clock (because the
    designers found a stable oscillator too expensive for their
    design and used the clock from their Sun workstation instead :)

    (O.K. Maybe it was not exactly 2.45 MHz; too lazy to reseach now.
    But well below 10 Mbps, that's for sure.)

    Given the timeframe (Apple ][ vs. februari 1980) I think some
    ethernet predecessor might not be far off.
     
  6. Franc Zabkar

    Franc Zabkar Guest

    If an internal cable connected the card to a BNC connector on the
    case, wouldn't that satisfy the standard?
    The chips on the card are dated 1989. IIRC, I first encountered
    [thick] Ethernet in 1984.


    - Franc Zabkar
     
  7. Gerard Bok

    Gerard Bok Guest

    Well, I recall some 1200-plus pages in that document :)
    Do you mind if I don't want to look for it now ?
    But my guess is: No !
    That's my point. The original thicknet required a 15-pin AUI
    connector. It took years for Thinnet / Cheapernet to appear (with
    only a BNC requirement). And even then, it was very unlikely for
    someone to design a card that was _only_ thinnet capable. So
    'newer' cards usually had both a 15-pin and a BNC connector.

    Best way to find out (I guess) is to put the card in an Apple ][
    and peek into the eprom's content.
     
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