Updating this old thread. The original designer of the "Pinball Mind" board passed away from cancer several years ago. His work, drawings, designs, etc were turned over to Marco Specialties who promptly did absolutely nothing and shelved it. So that's how things sit right now.
If anyone would like to design new modern boards for the Bally home model pinball machines, PLEASE DO IT. A modern replacement board is sorely needed. John Robertson at flippers.com has made some replacement cpu chips to bring the original boards back to life.