*[https://youtu.be/CIo93AE8Fsw SID Phase Accumulator explained] by [[Jeri Ellsworth]]
*[https://youtu.be/yadWu7hs4MU Oscilloscope comparison of 4 different SID chips]
*[https://youtu.be/fQU-WZZ67yM C64 SID vs Amiga Paula] [https://youtu.be/ioZRUVTKLx0 C64 SID vs Atari Pokey]
*[[Media:Mos 6581 sid.pdf|SID chip datasheet]] [https://www.waitingforfriday.com/?p=661 Web version]