a large selection of sound chips: Yamaha FM chips: YM2151 (OPM) YM2203 (OPN) YM2413 (OPLL) YM2414 (OPZ) used in Yamaha TX81Z YM2608 (OPNA) used in PC-98 YM2610 (OPNB) used in Neo Geo YM2610B (OPNB2) YM2612 (OPN2) used in Sega Genesis and FM Towns YM3526 (OPL) used in C64 Sound Expander YM3812 (OPL2) YMF262 (OPL3) with full 4-op support! Y8950 (OPL with ADPCM) ESS ESFM (like OPL3 but with more feat