Yep, I have all these too. They are EXTREMELY helpful for Bally, and not so much on "the other guy". Bally engineers really put some thought into service and diagnostics, with the blinking LED's, and separating all the testers out. They were on the cutting edge.
The "other guy's" tester is very helpful IF you have good PIA's on your driver board, but otherwise, it's really ineffective, because bead PIAS just lock it up, and it tells you NOTHING about a dead MPU. In fact, those MPU's are a REAL PAIN to repair, because you gotta dig deep in the schematics and circuitry; their "self diagnostics" are useless.
Chris
