RELEASED: November 25, 1974
Uses the same CPU as the standard MPU-17, but is clocked at twice the speed.
We had previously indicated a quantity of 22 electro-mechanical games were modified as a test of Solid State design. Ian MacDonald, the son of Bally engineer Doug MacDonald who was involved in these conversions, told us his father remembered building 17 units, although he thought it possible that other people there could have built or converted additional machines using spare parts. The boards for the machine were designed by Doug. His initials, the letters d and b, are etched into them in a back to back fashion similar to “db”, and may be hard to see.
SOURCE: Internet Pinball Database