Gigabyte GA-B75-DS3V Manual - Page 17

12) F_USB1/F_USB2 (USB 2.0/1.1 Headers) The headers conform to USB 2.0/1.1 specification. Each USB header can provide two USB ports via an optional USB bracket. For purchasing the optional USB bracket, please contact the local dealer. Pin No. Definition Pin No. Definition 1 Power (5V) 6 USB DY+ 9 1 2 Power (5V) 7 GND 10 2 3 USB DX- 8 GND 4 USB DY- 9 No Pin 5 USB DX+ 10 NC •• Do not plug the IEEE 1394 bracket (2x5-pin) cable into the USB header. •• Prior to installing the USB bracket, be sure to turn off your computer and unplug the power cord from the power outlet to prevent damage to the USB bracket. 13) COMA (Serial Port Header) The COM header can provide one serial port via an optional COM port cable. For purchasing the op- tional COM port cable, please contact the local dealer. Pin No. Definition Pin No. Definition 1 NDCD- 6 NDSR- 9 1 2 NSIN 7 NRTS- 10 2 3 NSOUT 8 NCTS- 4 NDTR- 9 NRI- 5 GND 10 No Pin 14) CLR_CMOS (Clear CMOS Jumper) Use this jumper to clear the BIOS configuration and reset the CMOS values to factory defaults. To clear the CMOS values, use a metal object like a screwdriver to touch the two pins for a few seconds. Open: Normal Short: Clear CMOS Values •• Always turn off your computer and unplug the power cord from the power outlet before clearing the CMOS values. •• After system restart, go to BIOS Setup to load factory defaults (select Load Optimized Defaults) or manually configure the BIOS settings (refer to Chapter 2, "BIOS Setup," for BIOS configurations). - 17 -