1. The cost of a mini-pac with harness is the same as a ipac 2 plus wires. Is there any difference, do they both work with the ipac software?
You can program both using the same WinIPac software.
The "
Mini-PAC Opti. With Harness and USB cable" has the wiring shown below and the optical encoder for spinner/trackball built in.
To use the
UTrak with the IPac, you'll need to get the optional USB2 adapter and plug it into an open USB port.

2. If I bought the u-track with usb harness how do I wire left/right buttons or do the minipac/ipac controller/software come with mouse button support?
The new IPac firmware supports assigning inputs as mouse buttons IIRC.
The Mini-Pac opti includes inputs for the mouse buttons, but the harness doesn't have wires in those slots IIRC.
It's easy to move unused or "
Extension Harness Pack" wires to those positions on the harness connector. (see wiring info below)
3. The u-track seems to have two sets of wiring harnesses, I can see one plugs into the usb harness, but what is the other for? I've checked the website and it's completely devoid of any wiring information.
Umm . . .
Right side of the Ultimarc homepage (and many other pages on the site), scroll down a little ways to find "
MiniPAC"
As you scroll down that page, you'll see. . .
The Mini-Pac board

Wiring harness for buttons and daisy chain ground

Wiring harness for trackball/spinner

A link at the bottom of the page to
wiring information (including a downloadable PDF version)

I'm using a mix of semitsu joysticks and happ buttons (to get the depth of my 3/4 panel), I'm just wondering if it's worth getting the pre-made ground daisy chained wires (they are cheap enough) because seimitsu and happ use different sized connectors.....
I love the pre-made daisy chains -- fast and easy to use.
Get some male .110" (2.8mm) and .187" (4.8mm) QDs and you can splice the two sizes of daisy chain together so each button can have the correct size ground connection.
Also get some female .110" crimps so you can snip off and replace the precrimped .187" QDs on the associated wires. (If there's enough wire, you may be able to reuse those trimmed ends on a later build.

)
Scott