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prom replacements?

Discussion in 'Electronic Repair' started by Ancient_Hacker, May 9, 2007.

  1. I have a nice old HP 5340A counter that isnt working. A little
    peeking at signals shows that the two state-machine control PROMS are
    loopy. They output "1"s all the time. Luckily the service manual
    lists the data that used to be in them. So burning new ones is a
    possibility. But:

    They're old old 16-pin proms, 5 address lines by eight bits out.

    Inputs on 10-14, outputs on 1-8 and 9.


    Does anyone know of anything with a similar pinout?

    Our do I have to make a 27C16 to this pinout adapter?



    Thanks,


    A_H
     
  2. Try contacting this guy, he may have the PROM image for yours.

    http://www.bluefeathertech.com/devices.html

    --
    Joe Leikhim K4SAT
    "The RFI-EMI-GUY"©

    "Treason doth never prosper: what's the reason?
    For if it prosper, none dare call it treason."

    "Follow The Money" ;-P
     
  3. Mark Zenier

    Mark Zenier Guest

    82S23
    SN74S188 (open collector)

    82S123
    SN74S288 (tri-state outputs)

    There's probably a dozen other part numbers from the various
    manufacturers in the mid 1970's, but these are probably the most
    common.

    Mark Zenier
    Googleproofaddress(account:mzenier provider:eskimo domain:com)
     
  4. Franc Zabkar

    Franc Zabkar Guest

    If pin 8 is ground, then it looks like a DM74S188 (open collector) or
    DM74S288 (tri-state).

    Other possible parts are N82S123 / N82S23, AM27S19C, MMI6331, IM5610C,
    SN74S288N, etc.

    I have an N82S123 which I can program for you. It's yours for the cost
    of postage from Australia.

    - Franc Zabkar
     
  5. Guest

    The TI version was TIB18S030. You can get the 74S288 at Jameco for a
    reasonable price.

    http://www.jameco.com/webapp/wcs/st...storeId=10001&catalogId=10001&productId=48717

    I'm in Southern CA and can program it if you supply the chip and data
    file -- all 32 bytes.

    GG
     
  6. JW

    JW Guest

    If they are, the OP should check pin 15 to be sure that the devices are
    being enabled. From my experiences, when a '288 goes south, it's outputs
    tend to drive low.
     
  7. Thanks to all for the info and kind offers.

    One problem though-- the manual I got from the Agilent site seems to
    have been partly OCR'ed-- and the tables of data for the PROMS has a
    few garbled and missing bits!!! What a bummer!!

    Does anyone have an actual manual for the 5340A? Or a PROM
    dump?



    Multitudinous thanks in advance,

    A_H
     
  8. Franc Zabkar

    Franc Zabkar Guest

    In the absence of a printed manual or a PROM programmer, why not
    verify the contents of your own PROMs using a little jig consisting of
    5 DIP switches and, if necessary, 8 pullup resistors and 8 LEDs?

    - Franc Zabkar
     
  9. Try contacting this guy, he may have the image and tools to build the proms.

    http://www.bluefeathertech.com/devices.html

    --
    Joe Leikhim K4SAT
    "The RFI-EMI-GUY"©

    "Treason doth never prosper: what's the reason?
    For if it prosper, none dare call it treason."

    "Follow The Money" ;-P
     
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