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I have an old laptop with a PS2 port and it has a mouse symbol on it. Does this mean I can only plug a mouse into this port and will a keyboard work?

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try it. It really depends on the laptop. Sometimes you can use a splitter like this maplin.co.uk/ps-2-notebook-splitter-97882 but sometimes not. –  Sirex Sep 5 '11 at 15:00
    
Yea, just try it, see what'll happen. –  wizlog Sep 5 '11 at 15:14
    
It probably wont work –  bbatman Sep 5 '11 at 15:17

3 Answers 3

up vote 4 down vote accepted

As an experiment, I dug up an old desktop with PS/2 connectors, connected the keyboard and mouse backwards, the keyboard did not light up or work while in the BIOS, Windows loaded and the mouse or keyboard did not work, the Windows hardware wizard said it installed a new device and to reboot.

I rebooted, but still they did not work, so I hot unplugged the devices and connected them to the proper ports, the mouse still did not work but the keyboard came to life. Both worked after another reboot.

So no, they will not work when connected to the wrong PS/2 ports on a desktop computer.

Next, I connected a keyboard to the PS/2 mouse port on my old Dell Latitude D600 notebook, booted Windows XP, the keyboard does not work or light up any lights, and the hardware wizard did not show up.

It's a bust. No, it will not work.

...end of smoke test...

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+1 There is a reason that they are color coded on desktops, but nice to have someone actually go through the effort of confirming it for an answer. I had discovered this long ago, before the color coding on motherboards existed, never did test it on a laptop though. –  MaQleod Sep 5 '11 at 17:47

According to Wikipedia probably not:

The pinouts of the connectors are the same, but most computers will not recognize devices connected to the wrong port.

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Agree. Physically, yes it'll go in, but it may not work as expected. –  MBraedley Sep 5 '11 at 15:43

You can plug in whatever you want because the pinouts are physically identical. A keyboard however will NOT work without a driver update. Chances are, if you have a old computer (laptop) that kind of driver update won't be available. Sorry.

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