After some research, its an ASUS P5A-B Super 7 MB. Trying to plug into a COM port won't work, this MB has a USB, Infrared, PS/2 Mouse Module Connector (USB/MIR, 18-1 pin block). I'm going to play around with the pinout to see if I can get it to work now plugging into that block.
Folks, I need help with this, trying to connect a PS/2 Mouse to my retro - Win 98 computer but can't figure out the pin-out for this. Has anybody been able to get this to work. I rather use a PS/2 mouse versus a serial port mouse.. Thx, Paul