|It's a "combo" PS/2 port. It is wired up to support either a mouse or a keyboard when that's plugged directly into the port, or you can use a standard Y cable wiring adapter that has one male PS/2 connector and two PS/2 female connectors, one female connector usually colored lime green to connect a mouse to, the other female connector usually colored purple to connect a keyboard to, at the same time. Usually the female connector for the mouse will NOT work with a keyboard and visa versa, but it's certainly possible for both connectors to support either of them.|
That "combo" PS/2 port was what older laptops had on them rather than two PS/2 ports- apparently some newer desktop mboards have that too.
If you have problems finding that locally, a place that sells accessories for laptops probably has it.
There were a few old desktop mboards that had two PS/2 ports that were both "combo" ports. You could plug a mouse or a keyboard into either port and it would be recognized.
The mboard / Windows probably can't support you connecting two mice or two keyboards to such "combo" PS/2 ports and both of them working, but Windows (95 and up) does support you having more than one mouse (PS/2, USB. or Serial) or keyboard (PS/2 or USB) connected if they connect different ways, and you can probably connect more than one USB mouse. (You can only use one mouse or keyboard at a time, but they all work, if enough IRQs for the PS/2 and/or Serial port is [are] available .)