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What are -5V and -12V used for?

B

BA

Diamond Member
So I'm looking to build a little router/webserver box.

So, go lookup the pinout for AT power, and it has +5,+12,-5,-12. Find this power supply, which is basically perfect as far as size, but only gives me +5,+12, -5. So what is that -12 for anyway? Can I get away without it, or am I gonna have to go find a DC-DC converter to get it?
 
Anyone else have a more definitive answer? Can I get away with just hooking up +5 and +12(and ground)?
 
-5V was used for some chips, like the 4Kb or 16Kb memory chips found in original IBM PCs and maybe some old hard drive controllers. I don't think -12V is used any more for the RS-232 serial ports because that voltage is generated by the interface chips from the +5V supply.
 
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