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Thread: MicroVAX II memory test failure

  1. #1

    Default MicroVAX II memory test failure

    I have got the memory test error:
    ------------------------------
    Performing normal system tests.
    7..6..
    ?1
    Failure.
    Normal operation not possible.
    ------------------------------
    Does it possible detect which bank (of 4) failure or which bit?
    It is very hard to unsolder all 4x9=36 memory chips

  2. #2
    Join Date
    Sep 2016
    Location
    Westminster, Colorado
    Posts
    35

    Default

    You can use console commands to peek/poke memory to try and determine where the problem is.

    Appendix A in MicroVAX_II_630QB_Technical_Manual_Nov85.pdf

    I'd suggest connecting the console port to a PC and writing a program to run a walking '1' test through the memory.

    CW

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