Sinclair ZX Spectrum Home Computer - AY Sound Interface.
Programming the AY-3-8912 on the MSX, Amstrad CPC, Atari ST and NeoGeo in Z80 & 68000 Assembly (P18) - YouTube
General Instrument AY-3-8910 - Wikipedia
So I have five SN76489's (the sound chip of the SEGA Master System), and an AY-3-8912 but nothing to use them with. I make good financial decisions 👍🏻 : r/chiptunes