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2022-07-17 14:14

Laurent

Registered: Apr 2004
Posts: 40

The 6581 has fallen into oblivion

Musicians seem to have lost interest for the original 6581 model.

Is it because of how it sounds (low resonant filter, combined waveforms) or because of technical challenges (huge filter variability between revisions, quality of filter emulation) ?
There are so many 6581 tunes that we all enjoy that I cannot believe the "sound" is the issue.
The funky distorted 6581 filter is absolutely loveable, not better or worse than 8580's, just different.

There are so many awesome examples..
Googachild
Miami Vice
4-Mat's Filter
Dirty Pair

Now that reSID is doing a good job at emulating the 6581, I assume one of last issues is that musicians have no guarantee that a tune will be played back correctly, with the same filter characteristics that they used when composing their tunes. Especially when they're played on a real c64, it just cannot work perfectly.
As of today, even if we wanted to organize a 6581 music competition it would be laborious to play them back correctly even with an emulator.
Some extra info could be certainly added to a .sid header, but running the .prg in Vice would be more difficult, the SID player init code would have to write to some unused SID addresses to "configure" the SID. This would please all emulators but would have no effect on the real thing (except if it had an emulated chip)..

Do you believe the 6581 is doomed ? :(

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2022-07-31 09:50

F7sus4

Registered: Apr 2013
Posts: 117

Quoting acrouzer

4-Mat was able to create a pseudo 4th channel by modulating the filter-type and filtered channels settings very quickly, seen here in oscilloscope view

This particular trick was earlier used in the concluding part of Triangle My Amelie in the very same compo, but what is important is that it does not require the SID model to specifically be 6581.

2022-08-01 20:00

Laurent

Registered: Apr 2004
Posts: 40

@Stone : Thanks for the info, who would have guessed !

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