ALLTEK ULTIMATE MPU CPU AND LAMP LED DRIVER BOARD COMBO DISCOUNT PACKAGE!! | eBay
CKBLY-MPU - Connector rebuild kit for wiring harness and board headers on all Bally and SEI Stern boards
PINBALL: Repairing Bally, Stern Pinball Games 1977-1985, part one
Here's a follow up image from my first post on this Bally 1978 Playboy machine. I've opened the backbox and the mpu looks like this (mainly corrosion on bottom). The light blinks