27 Mar
2006
27 Mar
'06
9:24 p.m.
Theoretically, the SID handbook published by Commodore
should be enough to
recreate the SID. Since NMOS isn't used very much anymore, that may be a
roadblock to making exact copies.
Also, I should point out that while both the 6581/2 and 8580 are NMOS, the
later 8580 is technically HMOS-2, which is a Commodore-specific high speed
NMOS manufacturing process. In addition, the 8580 *is* different w/r/t
waveforms, and corrects a voltage leak which was widely exploited as a cheap
4-bit D/A converter ($d418).
--
--------------------------------- personal: http://www.armory.com/~spectre/ ---
Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com
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