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Thread: SOL-20: Remapping Personality Module and video from Cxxx to Fxxx

  1. #11
    Join Date
    Dec 2011
    Location
    Dallas, TX
    Posts
    357

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    I finally had a chance to try the Cxxxx->Fxxxx remapping. The replacement personality module will accommodate jumpers on the motherboard, but I opted for the less permanent method of soldering a cable to a 74LS136 chip, and plugging it into the module.

    The remapping works by shorting pins 2 and 5 of the 74LS136 at U22:
    remap-chip.jpg

    The module does nothing special other than provide a convenient way to short the pins together, alongside jumpers to select an appropriately assembled ROM image:
    remap_jumpers.jpg

    Here's the whole thing:
    remap-overview.jpg

    Here's the remapped DPMON in action:
    remap-dump.jpg

    Dave

  2. #12

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    this is one of the coolest things ever !

  3. #13

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    Quote Originally Posted by wealign View Post
    this is one of the coolest things ever !
    And a great project for SOL-20 owners !

  4. #14
    Join Date
    Dec 2011
    Location
    Dallas, TX
    Posts
    357

    Default

    I still have spare PCBs if anyone wants one.

    Dave

  5. #15

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    Great looking work Dave!

    Mike

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