Connecting USB-mouse to PS/2 connector of computer. It works only with device which supports both interfaces (USB & PS/2).
USB Pin
Name
USB Pin
Number
Direction Usb Color PS/2 mouse controller Pin
Number
PS/2 mouse controller Pin
Name
Description PS/2 Color
VDC +5V 1 <--- Red 4 VDC +5V   Red
Data- 2 <--> White 1 Data   White
Data+ 3 ---> Green 5 Clock   Brown
Ground 4 ---- Black 3 Ground   Black

Very nice to have one more empty USB connector :).

It's good practice to pull up data/clock lines with some resistors of 10k or so. Especially when connecting to newer motherboards. In some cases signal has levels between 1.5 and 2.5 volts, and mouse don't work. Pulling up helps in that situations and doesn't harm if unnecessary.

 

4 pin USB A plug connector layout
4 pin USB A plug connector
at the USB cable
6 pin mini-DIN male (PS/2 STYLE) connector layout
6 pin mini-DIN male (PS/2 STYLE) connector
at the PS/2 mouse cable
According to 45 reports in our database (40 positive and 1 negative) this pinout should be correct.

Is this pinout
USB to PS/2 mouse or keyboard adapter visual pinout:
USB to PS/2 mouse or keyboard adapter diagram
click to enlarge
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