Recently got a nice Bally Lost World. It had been unused for some time so I cleaned it up real good, changed out the rubbers and plastics that were showing their age. Took out the battery, thinking of updating with a 1505 chip but still researching that part of it. Got it playing nicely with just minor adjustments and I think it will help me as I plan to refurbish the old Playboy I've had sitting for a couple years trying to make time to get working on it. Always looking for machines to add to the game room.