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(Topic ID: 211865)

Williams system 6 MPU u9 and u10

By CadillacMusic

6 years ago



Topic Stats

  • 4 posts
  • 3 Pinsiders participating
  • Latest reply 6 years ago by barakandl
  • Topic is favorited by 1 Pinsider

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    #4 6 years ago
     
    AMS

    barakandl

    nvram.weebly.com

    12y 132K 10,414

    OP
    Quoted from CadillacMusic:

    Cool. Just jump them like they're jumped on the later boards, I assume?

    Yes. If you are not worried about saving the chip cut him out and use the remaining leads to bridge over the data in to data out.

    Looking with scope on the data in and out will show a problem. Those data buffers for sure can cause a lock up.

    I believe the theory was when they where using six masked ROMs they needed the data buffers. If you go to three eprom setup, specially with 27c16 ROMs, there is no worries.

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