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Forums > C64 Composing > Sid 8580 technical specificication
2009-07-08 15:01
Fredrik

Registered: Apr 2009
Posts: 205
Sid 8580 technical specificication

Sid 8580 technical specificications:

3 voices
9 octave range
4 waveforms (Triangle, Sawtooth, Pulse and Noice)
programmable ADSR generator (Attack, Delay, Sustain and Release)
programmable filter selectable for each voice
master volyme control

Is there something I have forgot?
 
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2009-07-09 17:52
1BM

Registered: Nov 2002
Posts: 49
3rd oscillator waveform/volume readable, external signal routable through filter
2009-07-09 18:31
Soren
Account closed

Registered: Dec 2001
Posts: 547
too low volume on regular d418 samples, unless you mod your c64... ;-)
2009-07-09 18:49
Frantic

Registered: Mar 2003
Posts: 1661
8580.. didn't pay attention first... if it is 8580 (rather than 6581) then you have the "additional waveforms" too of coz..
2009-07-09 19:36
Soren
Account closed

Registered: Dec 2001
Posts: 547
afaik, most of the combined waveforms work on the old chip aswell, some of them just have lower volume... anyways, they are not the most important ones :-)
2009-07-09 19:57
Frantic

Registered: Mar 2003
Posts: 1661
@Jeff: Hmm... Maybe? ...but at least some of the waveforms are really almost silent on some chips... ...but I realize that I don't know exactly which ones and exactly for what revisions this holds. I've mostly relied on this taken for granted truth up to now, that "6581 does not have combined waveforms".

Details, anyone?
2009-07-09 20:10
Soren
Account closed

Registered: Dec 2001
Posts: 547
well, I am NOT trying to favourize 6581 over 8580, even though I've mostly used 6581 chips.

31,51,61 works quite ok on my 6581r4

71 is VERY silent (probably too silent to be usable)
and 31 is somewhat silent.

Also the "all waves combined" trick, used for hihats, after a few frames of noise wave, to give it a bit metallic sound, works perfectly on 6581.

I think I myself have only used 51 and F1 sofar... I haven't found use for the other ones.


Another thing... 8580 is good for switching filtertypes without clicking. 6581 is not THAT flexible concerning that, but still one can avoid most of the clicking by being a bit carefull with it :-)

6581 filter is characterized as "warm"

8580 filter is characterized as "plastic"

(just some terms used for describing how it sounds)

8580 has more powerfull resonance which also tends to increase the "volume" on filtered sounds.

6581 filter can do "saturation", which would probably also be described as a mild for of distortion.


That was a few more of the things I know about sid chips :-)

2009-07-10 09:23
Mace

Registered: May 2002
Posts: 1799
Tonhuvudet, what's your point?
2009-07-10 14:11
Frantic

Registered: Mar 2003
Posts: 1661
@Mace: It seems to me that he isn't trying to make a point, but to ask a question? (Maybe for writing something on his homepage or in an essay or whatever.. who cares? :)
2009-07-10 14:50
Mace

Registered: May 2002
Posts: 1799
What I meant is: what's the point of asking?
(And then, not responding to all our reactions...)
2009-07-10 16:17
Merman

Registered: Dec 2002
Posts: 140
Quote: Thanx!!


Yeah, but Commodore left the details about ring mod and sync out of the C64C user manual...
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