Ancient SCE A586B mobo vs. ASUS P2B-B mobo

I have a Parallel_PS/2 mouse to motherboard "adapter" that was connected to an Super Power - SCE - A586B motherboard. The plug to motherboard mouse connector is five in-line pins with only four wires connected. Those four wires run to the external PS/2 jack. I want to install this adapter in an ASUS P2B-B motherboard configuration. The ASUS P2B-B mobo has only the USB/MIR 18 pin location. Can anyone help me determine which pins on the ASUS USB/MIR connection need to be connected to the four wires? On the five pin in-line jack: pin 1 is red; pin 2 is not connected; pin 3 is green; pin 4 is yellow; and pin 5 is blue. I am guessing that PS/2-Mouse Data is pin2; pin 3 is not connected; pin 1 is ground; pin 5 is PS/2 Mouse Clock; and pin 4 is +5v but I'd like to be sure. Any help from a guru?

Thanks so much!
yrralrellimAsked:
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_Commented:
Do the pinouts here help?
http://library.mobrien.com:2031/Manu...4.htm#Keyboard

If you scroll up a little, it showa the pinout for the USB/MIR
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_Commented:
Thank you much.  : )
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