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Bamu®
Account closed
Registered: May 2005
Posts: 1332 |
Which 6581 revision...
Hi!
Which -> 6581 <- revision sounds best? Which one has the best sounding filters?
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Yodelking
Registered: Apr 2002
Posts: 189 |
Quote: To get back on topic, check out http://sid.kubarth.com/
anybody got a 6582 btw?
Yes, I have one. (It's my photo on that site) :)
I have 6582, 6581 R1 or R2 (those revision are unmarked afaik), R3, R4, and 8580 R5.
I haven't compared a lot though, but I know some chips within the same revision sounds very different.
Someone once told me that 6582 was a lot like the 8580, but digis played on it. |
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Devia
Registered: Oct 2004
Posts: 401 |
Well you _could_ test that 6582 ;-)
I read somewhere that R2 was already in production before the c64, so it would be fairly unlikely to find an R1 in a c64. It would have to be dated early 82.
Looking at the pictures on that site I come to think that maybe my one good R2 is a CSG and not a MOS. All other 6581 I have are MOS. Unfortunately I cannot (easily) check it as I have heat-sinked it, but I can remember the print being more dense and maybe even without a logo.
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Steppe
Registered: Jan 2002
Posts: 1510 |
I've got two R4ARs, would trade one for a R4 (for some odd reason I never had one of these). |
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Raf
Registered: Nov 2003
Posts: 343 |
6582 is replacement for 6581 , it's actually very 8580 alike (anyway if I remember right , it uses different caps , so 6582 may should have even different filter characteristics)
there is probably no 6582 in Poland however ;-)
I suppose 6581r4ar was introduced when c128 came out... it generally looks that c64 was imporoved (I mean the BN/E board) after C128D cost reduced came out circa 1987 (hence the 8580 and 5v only vic-II IMO) |
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Sidder
Account closed
Registered: Mar 2003
Posts: 56 |
Quoting Yodelking
I have 6582, 6581 R1 or R2 (those revision are unmarked afaik), R3, R4, and 8580 R5.
Hmmm... Maybe you should seriosly think about preparing comparison test for all these five chips? :)
1. Create sid-tune with all "debatable" elements (mixed waves, filters and even samples) included.
2. Play it on each SID chip type.
3. Record it and put result mp3 files into web.
(like done at www.sid.kubarth.com: http://sid.kubarth.com/files/sid_draxish_6581.mp3 and http://sid.kubarth.com/files/sid_draxish_8580.mp3 )
Such comparison would probably stop a lot of unproductive convesations. :] |
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Bamu®
Account closed
Registered: May 2005
Posts: 1332 |
Does someone could record some mp3s/oggs from different 6581 revisions? (8580 is not necasary)
A short filter slide from $00 to $FF should be enough. It would be interesting to hear how it sounds on different 658x rev.
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Bamu®
Account closed
Registered: May 2005
Posts: 1332 |
Quote: Does someone could record some mp3s/oggs from different 6581 revisions? (8580 is not necasary)
A short filter slide from $00 to $FF should be enough. It would be interesting to hear how it sounds on different 658x rev.
Actually, I quite often use $61 waveform for drums. It gives it quite a hard touch.
Depends on what is required even $31 (good for techno-electro sounds), $51, or $71 is used by me. So, it is everything but NOT USELESS!! :)
exemple:
09 00
61 AA
11 AA
11 A5
10 A0
10 98
10 92
10 81
FF 00
@JEFF
jeff wrote : "I just hate the stupid cut-off curves in 8580... makes no sense at all."
hmm, what exactly you mean with "stupid cutt-off" and "makes no sense at all"???????
I can remember, that my first 8580 tunes had very ugly (weak) filter settings.
There are tons of such tunes in HVSC that are afflicted by weakness, but that is a problem of the player & editor.
If you have a 6581 SID you can have the worst player and the filtered bass will always sound good. (since the cutoff is non linear)
To get a "warm" sound with the 8580 you just have to re-programm filters frame by frame... (however, it's only possible with more advanced players)
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Linus
Registered: Jun 2004
Posts: 639 |
lo,
Quote:it is everything but NOT USELESS!!
Hehe, indeed ... :P
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VIC
Registered: Aug 2003
Posts: 73 |
Quote: Actually, I quite often use $61 waveform for drums. It gives it quite a hard touch.
Depends on what is required even $31 (good for techno-electro sounds), $51, or $71 is used by me. So, it is everything but NOT USELESS!! :)
exemple:
09 00
61 AA
11 AA
11 A5
10 A0
10 98
10 92
10 81
FF 00
@JEFF
jeff wrote : "I just hate the stupid cut-off curves in 8580... makes no sense at all."
hmm, what exactly you mean with "stupid cutt-off" and "makes no sense at all"???????
I can remember, that my first 8580 tunes had very ugly (weak) filter settings.
There are tons of such tunes in HVSC that are afflicted by weakness, but that is a problem of the player & editor.
If you have a 6581 SID you can have the worst player and the filtered bass will always sound good. (since the cutoff is non linear)
To get a "warm" sound with the 8580 you just have to re-programm filters frame by frame... (however, it's only possible with more advanced players)
@Nata>>It's just because of Jeffs poor coding skills and lacking understanding of SID - nevermind him ;) |
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Soren
Registered: Dec 2001
Posts: 547 |
09 00
61 AA
11 AA
11 A5
10 A0
10 98
10 92
10 81
FF 00
still wondering what those freq values are?
actual highfreq values? or notetable-freqs which you have to
subtract $80 from ?
About the stupid filter curves of 8580.. again... $00-$80 or so seems to do something, but are like $00-$FF on 6581... and after $80 (on 8580) nothing amazing seems to happen(or?) So why was it done like this?
also:
>I can remember, that my first 8580 tunes had very ugly >(weak) filter settings.
>There are tons of such tunes in HVSC that are afflicted by >weakness, but that is a problem of the player & editor.
Sounds more like a problem of the composer to me.
Some tunes here, recorded from a 6581r4...
http://www.6581.dk/files/6581r4/
6581r4 seems to work just fine for those "new techno synth sound" etc...
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