Two of the most popular SID solutions for the C64 are finally back in stock: ARMSID and ARM2SID! ARMSID is a straight drop-in replacement for the original SID chip – just plug it in and enjoy accurate sound with less noise and automatic 6581/8580 detection. ARM2SID takes things even further, offering Double-SID, Triple-SID, and OPL FM synthesis (SFX Sound Expander emulation) – all without needing an extra double-SID board. Both chips are fully configurable and firmware-upgradeable directly from your C64.