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8296 bad PLA

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    8296 bad PLA

    I have a non-functional 8296. The PLA at U5 is super hot as soon as itís powered up. Iím assuming itís bad. Does anyone know of a replacement PLA for this machine?

    Thanks!

    #2
    On my 8296-D, out of the 2 PLA's, one was bad, and it was replaced by an EPROM on an adapter.

    Truly,
    Robert Bernardo
    Fresno Commodore User Group - http://www.dickestel.com/fcug.htm
    Southern California Commodore & Amiga Network - http://www.portcommodore.com/sccan

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      #3
      Iíve been looking at doing that. Thereís an article called ďHow to replace the PLA UE5 in a CBM8296 with a GAL 20V8Ē written in 2005 by Nicolas Welte that looks promising, but the adapter would be difficult to make. The article is here: http://x1541.de/

      I was hoping someone had come across a more ready-made solution. I looked into something called the PLAdvanced which could be used to replace PLAs in the following devices: Commodore 64 (and SX64), 1551 floppy drives, the CBM 6◊0, CBM7xo, Commodore 16 (and C116 & plus/4), the CBM 8296 UE5, the CBM 8296 UE6, the P500 U78 and the P500 U88 (and U7.

      It looks like it stopped being available in 2018 though.
      Last edited by Bish500; March 4, 2021, 09:01 AM.

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        #4
        Originally posted by RobertB View Post
        On my 8296-D, out of the 2 PLA's, one was bad, and it was replaced by an EPROM on an adapter.

        Truly,
        Robert Bernardo
        Fresno Commodore User Group - http://www.dickestel.com/fcug.htm
        Southern California Commodore & Amiga Network - http://www.portcommodore.com/sccan
        Roberto, how did you determine that one was bad. Did you perform a test of some sort?

        Comment


          #5
          I didn't test it, but my friend who knows PETs determined that one PLA was bad.

          Truly,
          Robert Bernardo
          Fresno Commodore User Group - http://www.dickestel.com/fcug.htm
          Southern California Commodore & Amiga Network - http://www.portcommodore.com/sccan

          Comment


            #6
            Does anyone have the JEDEC files for the two 8296 PLAs? I can program them if I had the JEDEC files and it would be a single chip replacement.
            Maintainer of http://vintagecomputer.ca

            Comment


              #7
              Originally posted by snuci View Post
              Does anyone have the JEDEC files for the two 8296 PLAs? I can program them if I had the JEDEC files and it would be a single chip replacement.
              Same here, I can program them too. Also, I can re-compile the equation to make a valid jedec file if the equations are available, or I can reverse engineer the equations if someone has a binary (ROM-like)
              dump.
              I haven't looked too hard to find these files since so far I haven't made any 8296 repair anyway.
              Frank

              Comment


                #8
                Originally posted by iz8dwf View Post
                I can reverse engineer the equations if someone has a binary (ROM-like) dump.
                Here are the two BIN files if you can work with these: http://vintagecomputer.ca/files/Comm...96-PLA-BIN.zip
                Maintainer of http://vintagecomputer.ca

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                  #9
                  https://drive.google.com/file/d/10Rq...ew?usp=sharing

                  since I don't have any 8296 to test these maps, use at your own risk

                  Frank

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