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Looking for programming algorithm for Harris 7685 PROM

Discussion in 'Electronic Components' started by Michi, Feb 10, 2007.

  1. Michi

    Michi Guest

    Hi,
    i have to program some PROMs for a HAM-Radio equipment. I have
    M3-7685-5 PROMs (2048x4) from Harris which are pin- and read
    compatible (but not write compatible) with 82S185 and others.

    But, because i have no PROM-Programmer, i will build one by myself. So
    i am looking for a Datasheet or/and a specification of the programming
    algorithm for the Harris 7685 PROM.

    Is anyone out there who has an old Databook from Harris ?
    Many Thanks. Michi
     
  2. Nermal

    Nermal Guest

    That brings back old memories. All of our old Harris data books have
    been trashed. Harris had a big problem with all of their PROMs: they
    grew back after programming. We quit using them for that reason.

    The first Data Books from Harris gave instructions on the programming
    protocol. The book indicated that these were the easiest and most
    forgiving devices (as far as programming parameters) in the industry.

    These PROMs were the opposite of convention: they were shipped all ones
    vs all zeros. The later data books indicated that the programming
    parameters were more critical. At the end even Harris was unable to
    supply us with programmed PROMs what did not grow back.
     
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