nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpq4p3v80030vmv2gcre99cptvmj6du3x70y0x9umwjh0tzp72nm9wqkjnxym it's the famous ym2151, used everywhere in arcade machines, and even some yamaha keyboards/modules.