[sdiy] AC Adaptor weirdness (semi-OT)

[Nihil Chimeraea]

Hey. This is a little OT since it's about a laptop and not a synth, but I didn't really have anywhere else to ask. Anyways. There's a laptop I've got, that's missing the AC adaptor. My plan is to modify a regular Ac adaptor to do the job, but the problem is is that the AC connector on the laptop isn't a standard one, and I have had no luck finding into about it. Instead of the traditional 'round hole with a pin in the middle design, the hole is shaped like a square with a rounded top, with three small pins aranged in an upwards pointed triangle. The top pin is labbelled 1, the bottom left labelled 2, and the bottom right pin labelled three. Anyone think they might know which is ground, which is positive, and which is negative? 



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