Connecting USB-mouse to PS/2 connector of computer. It works only with device which supports both interfaces (USB & PS/2).
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Direction Usb Color PS/2 mouse controller Pin
PS/2 mouse controller Pin
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.


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4 pin USB A or USB B plug connector layout
4 pin USB A or USB B plug connector
at the USB cable
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