Received my Optipac today and could wait to wire up my 3" Happs trackball and test it out. I wired i exactly as it says on Andys site. When I plug it in, I get a "Unrecognizable USB device" error. I emailed Andy direct, but I though I'd drop a note here also.
System:
Asus P4B Motherboard
1GB RAM
Pentium 4 1.6ghz CPU
Windows XP Professional
Optipac using serial to USB
Thanks!