In message <Pine.GSO.4.33.0211290137190.11964-100000@math.rice.edu>, Richard Ra
uch writes:

>
>And, although my basis for this isn't very strong, I think that if you
>have just one PS/2 connector, I'd start by assuming that it's a keyboard
>connector rather than a mouse connector.  (Prior to USB, about the only
>option going for an i386 laptop to have an external keyboard was PS/2.
>But you could get *either* PS/2 or serial mice.  So...if the port really
>cares what's plugged into it, and you have just one, I'd go with a
>keyboard.)
>

On laptops with just one connector, it's usually for both.  You can buy 
Y-cables that give you a mouse and a keyboard connector.

		--Steve Bellovin, http://www.research.att.com/~smb (me)
		http://www.wilyhacker.com ("Firewalls" book)