On Thu, 27 Jul 2000, Richard Atkinson wrote: > The 8580 has 'combined' waveforms that aren't in the 6581 Which are those? I remember that some 'combined' waveforms of the 6581 are quiet, and some (maybe sawtooth+triangle; it has been a long time) have quite complicated formulae. Has anyone derived the formulae for these waveforms? (The noise waveform of the 6581 was analyzed in detail by Asger Alstrup in 1994 or 1995.) BTW, is the 8580 noise waveform identical to the 6581? And while we are at it: has anyone analyzed the VIC-20 waveforms? I think the oscillators there can have some internal state that cannot entirely be reset via the CPU accessible registers. Marko - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tcm.hut.fi.
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