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I'd have to double check the jumpers but I am pretty sure how you have them set the board will never boot without a U6 ROM.
Check quench's link Note C about using a single 2732 at U2 which is for Bally -17 or Stern M100 games only. If you want to run Bally -35 software on that board see "note d"
The board would have left that factory with a chip in U6. It could have been baked under some HPS lights sitting on a shelf for years causing the fade.
Compare your board to note C or D in the pinwiki link . If it is not setup shown like note c it will not boot without a U6 ROM. I am pretty sure you are going to be changing the jumpers or getting new ROMs.
If you have no way to verify whats on that U2 chip you might be kind of stuck. I guess you could do the note C jumper and see if the MPU unlocks.
Good to hear that you like the NVRAM modules. Thanks!
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