Posted by Mario D'Alessio on 3, 2001 at 6:26 PM:
In Reply to: Re: Pin-outs revisited posted by Dr D on 3, 2001 at 4:40 PM:
: I don't know if the wiring is the same but if you look in the "What's New" section there is a link for attaching a Happ's trackball/spinner directly to the electronics of a mouse and connecting that to the PS/2 port.
: This might only work with the Happ's ones.
I believe that your last sentence is correct. The Happ TBs use active optics, while Millipede uses passive optics. I'm no expert, and I may be using the terminology incorrectly. But the OptiPAC+ page references these two technologies, "Supports active controls (Happ type) or passive (Suzo, Wico)". I'm sure Andy will be able to explain a lot better than I have.