Editing MOS Technology 6581 (section)

== Features ==
* Three separately programmable independent audio [[Electronic oscillator|oscillators]] (able to produce 65,535 equally spaced frequencies on a linear scale, 0.0625–4095.9375 [[Hertz|Hz]] range on a 1&nbsp;MHz clock)
* Four distinct [[waveform]]s per audio oscillator ([[Triangle wave|triangle]], [[Sawtooth wave|sawtooth]], [[Pulse wave|pulse]], [[pseudorandom noise|noise]]).<ref name="6581Spec">{{cite web |url=http://archive.6502.org/datasheets/mos_6581_sid.pdf |title=6581 Sound Interface Device (SID) |publisher=[[Commodore Semiconductor Group]] |date=October 1982 |url-status=live |archive-url=https://web.archive.org/web/20190705131001/http://archive.6502.org/datasheets/mos_6581_sid.pdf |archive-date=2019-07-05 |access-date=2019-05-07 }}</ref> Any combination of triangle, sawtooth, and pulse may be selected at the same time to produce additional waveforms.
* One multi mode [[Electronic filter|filter]] featuring [[Low-pass filter|low-pass]], [[High-pass filter|high-pass]] and [[Band-pass filter|band-pass]] outputs with 6&nbsp;dB/oct (bandpass) or 12 [[decibel|dB]]/[[octave]] (lowpass/highpass) [[rolloff]]. The different filter modes may be combined to produce additional timbres, for instance a [[Notch filter|notch-reject]] filter.
* Three attack/decay/sustain/release ([[ADSR envelope|ADSR]]) volume envelope controls, one for each audio oscillator
* Three [[Ring modulation|ring modulators]]<ref name="6581Spec" />
* [[Oscillator sync]] for each audio oscillator
* Two [[8-bit]] [[analog-to-digital converter]]s (typically used for game control [[paddle (game controller)|paddles]], but later also used for a [[computer mouse|mouse]])
* External audio input (for sound mixing with external signal sources)
* [[Statistical randomness|Random number]]/modulation generator (via reading the state of the 3rd oscillator or 3rd envelope generator)