6821 40-Pin PIA IC
Ships from US and is sold by Pinball Life$6.95
6821 Peripheral Interface Adapter IC used in Bally, Williams, and Stern boards. Substitute for 6820 PIA IC.
Bally #E-620-29, E-00620-0029, & 0A15-00803-0074.
Williams #5A-8972 & 5430-08972-00.
Data East/Sega/Stern #100-0255-00.