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Thread: Plus4 with a black screen

  1. #1

    Default Plus4 with a black screen

    I have liberated an old but nice Plus4 from a friend. It displays only black picture. I thought it was the CPu, and indeed it does not work. But it does not work even with a new CPU. TED, PLA and ROMS work fine in mu C16 test board.

    Any ideas?

  2. #2
    Join Date
    Mar 2012
    Location
    Augusta, Georgia, USA
    Posts
    663

    Default

    There is a test cartridge image around you can use, but if you have already exchanged all those chips, you probably have bad RAM.

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