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MOS 6581/8580 R5 SID Sound IC Chip CBM Commodore 64/128 Retro Item Specifics - Condition: Vintage. Tested 100% Working. No bent or missing pins. Sold as is. MOS 8585 R5 SID Sound IC Chip(VIC-II) CBM Commodore 64/12828-pin plastic DIP package1589 25 Date Code MOS Technology SID - Technical details The SID is a mixed-mode integrated circuit, featuring both digital and analog circuitry. All control ports are digital, but the output ports are analog. The SID features three-voice synthesis, where each voice may use one of four different waveforms: square wave (with variable pulse width), triangle wave, sawtooth wave and a pseudo-random (but not white noise) wave. Each voice may be ring modulated with one of the other waves, i.e. the frequency spectrum is multiplied and output. The ring modulation, filter, and programming techniques for switching between different waveforms at high speed make up the characteristic sound of the SID. Each voice may be passed through a common, digitally controlled analog filter with variable cut-off frequency and resonance, which is constructed with the aid of capacitors external to the circuit. An external audio in port enables external audio to be passed through the filter. The 6581 had a quirk that caused changes in volume level on a channel to result in a slight pop . Eventually this bug was found to be useful for producing a fourth voice of percussive sounds, digitized speech, and even short excerpts of digital recordings (the Commodore ...

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Featured item

LINCOLN New Stainless Steel Metal Cigarette Oil Lighter

0 bids

£0.99 (2.11 AUD) Fb: 4894 (99.0%)

43m 13s~

Description 100% Brand New High Quality Stainless Steel Payment Condition Buyer must settle payment within 7 days after auction ended I accept Paypal ONLY Shipping & Handling It takes 8-12 working days for shipping Graphic on both side