via mycommodore64.com
"For 64 Owners Who Need Stereo Sound
Adding a second SID to your 64 & 128 has always involved soldering, cables, jumpers and more! Now you have a real alternative! A Plug & Go Option!
The SID Symphony II 6581 Cartridge – This is as simple as it can be, insert your Commodore 6581 SID (not included) into the empty socket and plug into your Commodore 64! Thats it!
As simple as ABC, works with any software which access between the $DE00 to $DFE0 address range.
Commodore 6581 SID is not included.
Plug In 6581 SID Cartidge designed by Digital Audio Concepts"
Update via Richard Atkinson in the comments: "There are some clones of Digital Audio Concepts' SID Symphony II cartridge being sold on ebay UK at the moment [link]. There are some problems with the clones and I have written an article about how to fix these."
via the article: "The designer of the SID Symphony II, Vanessa Ezekowitz, was kind enough to furnish me with circuit diagrams of her SID expansions. There are internal and external expansions available, from her website Digital Audio Concepts. (back online after a recent SOPA protest)"
There are some clones of Digital Audio Concepts' SID Symphony II cartridge being sold on ebay UK at the moment. There are some problems with the clones and I have written an article about how to fix these.
ReplyDeletehttp://rga24.blogspot.com/2012/01/reengineering-alee650s-sid-symphony-ii.html