shock__ wrote:Get a $5 multimeter - that should be enough to find out which lines are VCC, GND and which hold data (once you have GND and VCC down you can experiment).
Wouldn't want to kill your (expensive) setup because you shorted out something.
^^ this ^^
You need to find witch one is +5v and witch one is GND. Once you got that pat, there is no risk of damaging the mainboard. Test the pins on the motherboard first (careful not to short the pins with the multimeter) then test the pins on whatever PS/2 header you own.
This is the most common pinout for a PS/2 header:
The attachment soyo2.gif is no longer available
If your PS/2 header looks like that (5 pin block, 2nd pin not connected) then you just need to move the pins at the end of the header to mach your motherboard after you have located GND and VCC+. If you get 5V on the multimeter, red is VCC and black is Ground. If you get -5V it's the other way around.