I need help with modchip

Discussion in 'Sega Saturn Programming and Development' started by thelocs, Oct 29, 2014.

  1. thelocs

    thelocs Newly Registered

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    Hello people.

    **First I need to say, sorry my bad english. I'm not good at writing and I am using the Google Translator. Please, have patience with me hehehehehehe

    You guys are my last chance! I wan't install this mod chip on my Sega Saturn:

    https://www.dropbox.com/s/mvobfbrzp45hnbn/IMG_20141029_204303.jpg?dl=0
    https://www.dropbox.com/s/88ljbstft0mfqer/IMG_20141029_204347.jpg?dl=0

    But I have no idea how to install it. My SS is this, Sega Derby Saturn (HST-3220):

    https://www.dropbox.com/s/dtzklnrswdx24ao/IMG_20141029_204106.jpg?dl=0

    I tried to use the modchip before, installing the purple cable at the +5V on the power supply and, installed the ribbons correctly. When I turn on my SS, the cannon starts trying to read the Discs, but nothing happens.

    Please, someone can help me?

    Thank's!
     
  2. TriMesh

    TriMesh Site Supporter 2013-2017

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    I suspect the problem is that you have a modchip with no on-board oscillator, and that Derby Stallion machine is a late production unit that had a different clock signal on pin 1 of the drive connector. The first thing to do is to open the machine up and check the type number on the CD-ROM controller board. I suspect it will be "JVC EXL-P608", in which case it will have a 33MHz clock on pin 1, and that board looks like it's designed for the 8.4MHz clock used on the earlier machines.
     
  3. thelocs

    thelocs Newly Registered

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    Oh bad news for me :( the model on the board are the JVC EXL-P608. If I change the CD-ROM, I will be able to setup that modchip?
     
  4. Druidic teacher

    Druidic teacher Officer at Arms

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    Last edited: Jun 22, 2017
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