SID differences (6581 vs. 8580)
qbix003
I noticed some SID's when played with the 8580 have different notes
during the musical playback. However, I heard the 8580 has a difficult
time replaying "digital sound" effects, like in Wolfenstein.
Also, I know the Commodore 64C comes with an 8580 SID chip. However what
SID does the Commodore 128/128D have?
I am about to buy a Commodore 64 "breadbox" style (going to unhook my
Commodore 128D and put it away so nothing happens to it :P). I know
pretty much all Commodore 64 "breadbox" have the 6581. However if
anything happened to the SID could I replace it with the 8580?
Thanks.
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Jeff Ledger
> I am about to buy a Commodore 64 "breadbox" style (going to unhook my
> Commodore 128D and put it away so nothing happens to it :P). I know
> pretty much all Commodore 64 "breadbox" have the 6581. However if
> anything happened to the SID could I replace it with the 8580?
>
You could cheat a little and do what I do... :)
I like the sound of the original breadbox SID (6581) but
I hate the keyboard, so I've been replacing my c64C boards
with original breadbox (REV2) boards. They fit without
too much effort. Although, I don't think I could resist
using a 128D as my primary computer if I had one.
Anyone got a 128D for sale? <GRIN>
Oldbitcollector
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Leif Bloomquist
news:3fcf6605$1...@corp.newsgroups.com...
> I like the sound of the original breadbox SID (6581) but
> I hate the keyboard, so I've been replacing my c64C boards
> with original breadbox (REV2) boards. They fit without
Wouldn't it work if you just swapped the SID chips? I have this vague idea
that they're 100% pin-compatible.
-Leif
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wats...@ten.tsacmoc
> Wouldn't it work if you just swapped the SID chips? I have this vague idea
> that they're 100% pin-compatible.
If I recall, the pinouts are the same, but the voltage levels are
different! If memory serves, the 6581 runs on 9V and the 8580 uses 12V,
but I could be mistaken. Check Google -- there are sites out there
describing the surgery needed to do a SID swap such as this.
As an alternative, a resistor can be connected between the audio in and
GND pins on the 8580 to reproduce the voltage leak that allows digital
sound using the 6581's volume register. This is what I did on my 128D,
and it sound just fine. Again, Google can provide you links that specify
what kind of resistor is needed and what pin #s to connect.
Hope that helps!
Dave Ross (Watson)
Sam Gillett
wats...@ten.tsacmoc wrote ...
>If I recall, the pinouts are the same, but the voltage levels are
>different! If memory serves, the 6581 runs on 9V and the 8580 uses 12V,
>but I could be mistaken. Check Google -- there are sites out there
>describing the surgery needed to do a SID swap such as this.
>
>As an alternative, a resistor can be connected between the audio in and
>GND pins on the 8580 to reproduce the voltage leak that allows digital
>sound using the 6581's volume register. This is what I did on my 128D,
>and it sound just fine. Again, Google can provide you links that specify
>what kind of resistor is needed and what pin #s to connect.
One link for info about differences in the SID chips is article # 296 on
Cameron's Commodore Knowledge Base.
http://www.floodgap.com/retrobits/ckb/display.cgi?296
And, as you say, Google can provide many more.
Best regards,
Sam Gillett aka Mars Probe @ Starship Intrepid 1-972-221-4088