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Thread: Apple IIE won't boot up.

  1. #11

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    Quote Originally Posted by David_M View Post
    Yes they do fail and it might be the EF ROM that was faulty if you had a version mismatch between the eprom you first programmed and the CD ROM.

    I wrote this EF ROM replacement to help diagnose faulty RAM, it will display some basic test results and also beeps the speaker to indicate faults if RAM is too bad to read the displayed results.
    https://drive.google.com/open?id=1Mv...A4t71CUkL3s6Ta
    Its a handy diagnostic tool and functions even when your RAM doesnt.
    I posted the link a while back but it may have been lost when all those messages vanished earlier in the year.
    EF rom was all good. I plugged it back in with the replacement CD rom and it worked just fine. I made sure I matched the ROM versions up (internet has a wonderful archive of all Apple IIE roms).
    System 80 Expansion Interface located! Thanks to all who helped out and the good people in the NZ vintage computer forums!

  2. #12

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    Quote Originally Posted by 3pcedev View Post
    It's rare - but the mask rom's can fail!
    They sure can. I've had several diagnostic episodes where the a mask ROM was at fault. From memory, one on a PET, one on an Apple II and one on a System 80. I'm sure there are others.

    Tez
    ------------------------------------------------
    My vintage collection: https://classic-computers.org.nz/collection/
    My vintage activities blog: https://www.classic-computers.org.nz/blog/
    Twitter: @classiccomputNZ ; YouTube Videos: (click here)


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