"too old" circuits dataSheet

Discussion in 'Electronics Resources' started by xaevus, Aug 18, 2013.

  1. xaevus

    Thread Starter New Member

    Aug 18, 2013
    4
    0
    Hello there,
    I just registered your community in search of information.
    A friend gave me a bunch of circuits he found in the garage of his new house.
    I used google to find the corresponding dataSheets BUT after some attempts, i still haven't found informations about
    ZCM38831P manufactured by MOTOROLA in 1984,
    it has 24 pins, plastic DIP package
    I hope one of you will remember what this circuit is and maybe find a dataSheet.
    Thanks for your help !
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,441
    3,361
    ZCM38831P is most likely an in-house part number requested by an OEM.
    1984 is not that old and my guess is that it is a 2k x 8 ROM.
     
  3. xaevus

    Thread Starter New Member

    Aug 18, 2013
    4
    0
    each chip is labeled with motorola's logo and it is not an eprom (no window for UV light).
    Thanks for your help, but without any DataSheet, i cannot use these circuits...
    Thanks again and have a good day !
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,545
    2,370
    If you have the circuit diagrams it should indicate at least what kind of IC and what is the nature of the equipment it is designed for?
    Max.
     
  5. MrChips

    Moderator

    Oct 2, 2009
    12,441
    3,361
    I said ROM, not UV-EPROM.
    A mask programmable ROM is programmed by the chip manufacturer.
    You send them your code and they program the chip for you. It cannot be erased nor reprogrammed. There is no window for UV erasure.
     
    Last edited: Aug 21, 2013
  6. xaevus

    Thread Starter New Member

    Aug 18, 2013
    4
    0
    I only have ce circuit itself no diagram, no datasheet, no document.
    These chips have been found by a friend of mine in the garage of his new house.
    About the ROM hypothesis, i would say that this kind of circuit was extremely rare in 1984 and only used by rare professionals. All we could get easily at this time were EPROMS.
     
  7. xaevus

    Thread Starter New Member

    Aug 18, 2013
    4
    0
    If anyone remembers what this circuits are, it would be great.
    Datasheet would be wonderful.
    Hypothesis are not useful, but thanks for trying.
     
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