Pinouts >  Keyboard, Mouse and other input devices cables and adapters scheme
4 pin USB A plug connector layout
4 pin USB A plug connector
at the USB cable
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.

 

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
Pinout status: +45 -2
According to 51 reports in our database (45 positive and 2 negative) the USB to PS/2 mouse or keyboard adapter pinout should be correct.

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