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Thread: -12 on motherboards?

  1. #1
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    -12 on motherboards?

    Does anybody know what does -12 do on motherboards. i know -5 used for serial port and stuff like that but what does -12 used for?
    Fosgate

    System Comp V3 - In progress.
    Low power MB with C7 CPU, DC-DC PSU, car ECU link, USB TV, GPS, 7" TFT, Wireless, Voice.

  2. #2
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    Your video card requires -12V
    --
    GrahamS
    www.mp3uk.freeserve.co.uk

  3. #3
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    No mate i tryed it.
    video card does require -12v
    i tryed on PCI and ISA ones they both work fine in windows and dos on every resolution!
    Fosgate

    System Comp V3 - In progress.
    Low power MB with C7 CPU, DC-DC PSU, car ECU link, USB TV, GPS, 7" TFT, Wireless, Voice.

  4. #4
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    Opss... i mean it DOESNT require -12v

    Fosgate

    System Comp V3 - In progress.
    Low power MB with C7 CPU, DC-DC PSU, car ECU link, USB TV, GPS, 7" TFT, Wireless, Voice.

  5. #5
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    Motherboards use -12V for serial ports. -5V is only for peripheral cards that need it. The specification for RS-232 requires a voltage from -10 to -15 to drive the data lines. From my experience, -12V was also needed by the VGA. Maybe some newer cards don't require it, though.


    --Jason
    http://jump.to/m2pc
    Jason Johnson
    Yorba Linda, California
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    MPC Phase IV - *** PENDING ***

  6. #6
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    This may go against what everyone here says but,

    My mouse on my mp3 player is serial.
    It works fine with out the -12

    I removed on of the power slots for the power
    and my Banshee which is on it right now works great

  7. #7
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    Thanx for replyes guys.

    As i said i tryed few different video cards and mouse without -5 and -12 and i tell you what i works just fine under windows and DOS

    I recon its up to the motherboard, some motherboards use -12 and -5 and some dont (but i think -5 is still used for serial port).Those two voltages are sort of left on the powersupply from good old days when motherboards needed -12 and -5 to operate.

    However those to voltages may be still needed for some divices to operate correctly.

    Fosgate.
    Fosgate

    System Comp V3 - In progress.
    Low power MB with C7 CPU, DC-DC PSU, car ECU link, USB TV, GPS, 7" TFT, Wireless, Voice.

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