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-12V rail

A

angelicvoices

Limp Gawd
Joined
Jun 19, 2009
Messages
443
What exactly does the -12V rail power? I can never find any info on the -12V and -5V rails.
 
One of the two were for some special, older, ISA slot cards.

The other one.... I don't know!
 
-5v was for some ISA and older PCI stuff latest ATX specs nixed the -5v
-12v not sure on but its still around
 
-12V is used for COM ports and other legacy I/O. These days this signaling voltage is often generated on-chip, but is still present on the ATX connector for compatibility purposes.

-5 as said was used with some ISA cards (mostly sound cards, IIRC), and there hasn't been any need for it since the late 90s.
 
Elledan said:
-5 as said was used with some ISA cards (mostly sound cards, IIRC), and there hasn't been any need for it since the late 90s.
Click to expand...

There are a few exceptions to this, with one big one being the SoundBlaster audio setups on some MSI s939 boards.
 
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