What is the difference between a USB and PS/2 connector?
If your mouse has a PS/2 connector, it has a PS driver and needs to be connected to the compatible hardware device (PS/2 port) in your computer. If your mouse has a USB connector, it has a USB driver and needs to be connected to the compatible hardware device (USB port) in your computer. In both cases, you must also make sure the device is integrated, so go to the control panel and activate the appropriate port. Q: I can’t get the third button to work on my MS-DOS software. A: The third button functionality is not available in MS-DOS applications/windows.