(Topic ID: 207903)

Unknown DMD board for Williams / Bally - Works somewhat.


By Robotworkshop

2 years ago



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  • 3 posts
  • 2 Pinsiders participating
  • Latest reply 2 years ago by Robotworkshop
  • Topic is favorited by 1 Pinsider

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    #1 2 years ago

    A friend of mine asked me to look at his DMD display board. It was working much of the time but at some points it would show a garbled display. This is not a board that I expected to see. I'm not sure exactly who made this unmarked clone board. Is this an early Rottendog board? Did others make reproduction DMD boards?

    I seem to recall reading somewhere that some games send out a lot more data and refresh the DMD displays faster than others. Perhaps this may work in a different game that doesn't update the display as often. It looks like this is based on a programmable ASIC so maybe there are updates to the code to fix it.

    Does anyone recognize this board or know where I can find any technical details on it?

    DMD_bot (resized).jpg

    DMD_top (resized).jpg

    #3 2 years ago

    He said it came with a batch of boards he had picked up. It was tried in a Dracula and Fish Tales with the same results. Its almost as if it can't handle too many display updates. We tried swapping in a couple different SRAM chips (known good ones) with the same result. Maybe this is just a buggy version and not a very good repro.

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