23128 PROM Dump

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    • 19 October 2024 at 9:29 pm #3423
      Florian HexenfingerFlorian Hexenfinger
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        Hi,

        Would anyone be able to point me to a dump of the code held in the 23128 mask PROM, IC408 (or the EPROMS at IC407/IC408 so I can stitch them together and use in a 27C128)?

        The original has gone completely short between pins 14 and 28 – it’s been removed and the empty space socketed, but I’m having a lot of trouble finding the ROM…  I’m sure it’s included in the emulator, yet identifying it is the problem.

        Thank you!

         

        Florian

      • 20 October 2024 at 4:55 am #3424
        Florian HexenfingerFlorian Hexenfinger
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          All done.

           

          Removed 2764s from another machine and read them.  Low-profile socketed that board and replaced the originals.  Burned some extra 64s and the 27C128 that was needed, which works without socket modification.

          Also socketed one end of each of the ribbon cables to make future dismantling and testing easier, plus of course the UHF lead from the modulator.

          Then like an idiot found the ROMs in the EMU – same checksums of course…

          Attachments:

          1. 2024-10-20-02-53-11.png

          2. 2024-10-20-02-53-59.png

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