I have an Aiptek graphics tablet to install on my Toshiba Satellite A30. The Tablet comes conveniently with a triple headed lead - a PS2, a 9pin serial, and one of the older 5pin Din keyboard plugs. On the rear of the Toshiba is lan, usb's,phone, printer, monitor, and what looks like a ps2 socket but isn't. On the sides are a couple of others that I can't yet figure out. In total, there are 12 types of socket on the laptop, and three plugs on the tablet.