82C55AC-2 NEC - CMOS PROGRAMMABLE PERIPHERAL INTERFACE compatible with the Intel 8255 Programmable Peripheral Interface (PPI) thats was used a lot for connecting all kind of I/O devices like joysticks, printers or keyboard. This chip was used in the famous MSX-computers and the Spectravideo SVI-318 and SVI-328. https://www.heinpragt.com/download1/TMP82C55AP-2datasheet.pdf