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Old 14 December 2012, 17:43   #21
Hewitson
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I suggest connecting 330kohm resistor between ext. in and GND. 8580 sounds almost as good as 6581 with the mod.

Of course, there is quite a few revision of the 6581. Some sound better than 8580, some sound worse.

Last edited by Hewitson; 15 December 2012 at 07:57.
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Old 13 March 2014, 11:21   #22
hansel75
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Quote:
Originally Posted by Hewitson View Post
I suggest connecting 330kohm resistor between ext. in and GND. 8580 sounds almost as good as 6581 with the mod.

Of course, there is quite a few revision of the 6581. Some sound better than 8580, some sound worse.
I have just ordered some 330kohm 1/4w resistors, once i get them i am going to try out this mod on my c64c!

Thanks for the info Hewitson, and i have confirmed your info is correct from reading other forums and links.
More info here- http://ist.uwaterloo.ca/~schepers/MJ...talvolume.html
And i have yet to see someone who had done this mod have any problems, and after a lot of thought on whether to do it or not, i have decided i am going to try it out.

This c64c and it's lack of volume with samples is killing me lol
Has anyone ever heard impossible mission on an 8580, it's really sad not being able to hear the voices properly.
That goes for any game with samples for that matter, it's horrible as the chip generated sounds drown out the samples, Turbo Outrun is another good example.

Some people are even saying the 8580 sounds more bassy with this mod as well, just like the good old 6581 sounded

I will report back here once i have done the mod with some results!
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Old 13 March 2014, 16:29   #23
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I still maintain my view that it's better to get a 6581 machine than do this "fix", it's more problems than it's worth.
I did the "ext-in to ground with resistor" mod and it yielded no results.

The 6581 is not bassier, it just sounds... different. And you won't get that because that depends on the filters., unless you swap the filters around (I would not recommend it)

You can also wait for the SIDFixer board.
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Old 13 March 2014, 22:59   #24
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The 6581 is not bassier, it just sounds... different. And you won't get that because that depends on the filters., unless you swap the filters around (I would not recommend it)
Yeah, if we talk about bass capabilities the 8580 has it, anything by Linus/Conrad/Randall/Jammer will prove that. Linus has had my speakers hitting against their end stops at times.

If you want good sample playback on the old games just buy a breadbin on ebay and use that for gaming, and the C64C for demos/modern SID tunes.
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Old 14 March 2014, 02:07   #25
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My tune at Datastorm 2014 made some massive rumble and it was 8580
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Old 14 March 2014, 10:43   #26
hansel75
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I am still looking around for another 6581 breadbin, but regardless of that i am going to try this mod out on my c64c once i get the resistor.

I don't think any harm can come from trying this mod, i have only read about success stories so far on lemon amiga and other sites, and if it doesn't sound right then it's easy enough to revert back to default.

I mainly use my c64c for old games, and to me it's just not the same with the changes they made in 8580, and not being able to hear any samples in games.
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Old 14 March 2014, 11:22   #27
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I have the opposite problem - I have many C64s but all of them with 6581s, and would like to get at least one with an 8580. I would trade one, but unfortunately it's unrealistic due to postage costs to Australia..
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Old 25 March 2014, 09:16   #28
hansel75
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I just did the sound mod on my C64c with a 330k ohm 1/4w resistor, and it works great

The sample volume now matches the rest of the chip sounds, and sounds just like the good old 6581.

I have tested impossible mission, turbo outrun and a few others and it sounds superb!
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Old 25 March 2014, 11:52   #29
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Quote:
Originally Posted by hansel75 View Post
I just did the sound mod on my C64c with a 330k ohm 1/4w resistor, and it works great

The sample volume now matches the rest of the chip sounds, and sounds just like the good old 6581.

I have tested impossible mission, turbo outrun and a few others and it sounds superb!
Its not rocket science it just puts a dc bias on the master volume as the older sids had.

http://sid.kubarth.com/articles/the_c64_digi.txt more than you ever needed to know about it.

Oh and hansel,

your so hot right now...
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Old 25 March 2014, 16:30   #30
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Quote:
Originally Posted by hansel75 View Post
I just did the sound mod on my C64c with a 330k ohm 1/4w resistor, and it works great

The sample volume now matches the rest of the chip sounds, and sounds just like the good old 6581.

I have tested impossible mission, turbo outrun and a few others and it sounds superb!
Glad it went well for you.

I still wouldn't risk it on my own C64C though. I know it works but, damn those SID chips are fragile.

Also my fingers are all thumbs
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