UPD75P56 Datasheet, Features, Application

UPD75P56 - (UPD75P56 / UPD75P66) 4-Bit Single-Chip One-Time Programmable CMOS Microcomputers

UPD75P66 - (UPD75P56 / UPD75P66) 4-Bit Single-Chip One-Time Programmable CMOS Microcomputers