"This is a blank printed circuit board for an EFM (Electronics for Music) Wildcat modular synth. This is basically a diy modular synth on a single board. This auction also includes the special PIC (programmable integrated circuit) chip required for the midi to CV part of the circuit...
Here are a couple of good online sources of info about this board:
www.dontlisten.com/sdiy/wildcat/efm-wildcat.pdf
http://www.yusynth.net/Wildcat/index.html
I believe this is the rev1 board."