Yamaha YM2149 Sound Generator Chip AY 3-8910
The AY-3-8910 is a 3-Voice Programmable Sound Generator (PSG) designed by General Instrument in 1978, initially for use with their 16-bit CP1610 or one of the PIC1650 series of 8-bit microcomputers. It has two general-purpose 8-bit parallel I/O ports, A and B.