OK,
First... There are two versions of the game: Proto5 and 1.0. They have separate sound board software and they are NOT compatible... and to make matters worse, the Version 2 which works with the production 1.0 version of the game isn't available on download sites.
Release 1 - CRC D2ED9F5E
Release 2 - CRC 4ED9E803
If you have Release 2 of the sound board, please dump the U2 ROM and submit it!!!
Running Release 1 on a Version 1.0 game results in clicking sounds and sound samples repeating from the start. They never finish playing because the logic board is sending the sound board resets repeatedly and just before the reset is sent, the game pauses ever so briefly. The fix? Downgrade the 4 Program ROMs to Proto5.
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Next, the bane of RevX boards everywere are leaking SMT caps. If you have a board, recap it. Hopefully you get it before the caps p*ss all over the board and corrode traces. I have one here that I cleaned, recapped, and patched several traces on but was still unstable. The cause was found tonight and was a difficult one to find: the electrolyte ate the contacts off one end of an SMT resistor. This interrupted the Address Latch (ALTCH signal) which is used to separate out the Data Bus signals from the combined Address Bus signals. It was barely making contact so the game would work, but would crash randomly and would fail random Video RAM and ROM tests.
Wasn't easy to track down, but damn it was satisfying to see it running properly again!

First... There are two versions of the game: Proto5 and 1.0. They have separate sound board software and they are NOT compatible... and to make matters worse, the Version 2 which works with the production 1.0 version of the game isn't available on download sites.
Release 1 - CRC D2ED9F5E
Release 2 - CRC 4ED9E803
If you have Release 2 of the sound board, please dump the U2 ROM and submit it!!!
Running Release 1 on a Version 1.0 game results in clicking sounds and sound samples repeating from the start. They never finish playing because the logic board is sending the sound board resets repeatedly and just before the reset is sent, the game pauses ever so briefly. The fix? Downgrade the 4 Program ROMs to Proto5.
-----------
Next, the bane of RevX boards everywere are leaking SMT caps. If you have a board, recap it. Hopefully you get it before the caps p*ss all over the board and corrode traces. I have one here that I cleaned, recapped, and patched several traces on but was still unstable. The cause was found tonight and was a difficult one to find: the electrolyte ate the contacts off one end of an SMT resistor. This interrupted the Address Latch (ALTCH signal) which is used to separate out the Data Bus signals from the combined Address Bus signals. It was barely making contact so the game would work, but would crash randomly and would fail random Video RAM and ROM tests.
Wasn't easy to track down, but damn it was satisfying to see it running properly again!



