A new replacement of the MOS 6581 and 8580 SID music chip used in the Commodore C64 and C128. Real "plug & play" solution. Just insert instead of the original SID chip into the socket and its done. Accurate sound, significantly lower noise level and less interference from the power supply than the original SID. Automatic recognition of 6581/8580 mode. You can change it anytime by using simple configuration utility to change the SID type, tune the audio filters and test your ARMSID. Lower power consumption than the original. Easy firmware update from the C64/C128 app.