American Megatrends MegaDual User Manual page 24

Step 8 Attach Cables,
J2 USB/RJ45 Combination J2A is 4-pin USB (Universal Serial Bus) stacked connector. J2A, the USB
connector, is on bottom. J2B, the RJ45 connector, is on top. The pinout for the USB port
is:
JP2 Power-on Switch JP2 is a two-pin single-inline berg. This is the soft-off power switch. When the system
if on, if JP2 is shorted for more than four seconds, them the system power supplies go into
soft-off state.
Once the system is in soft-off state, one push of this button turns the system back on.
JP1 Safe Mode Boot Option JP1 is a 2-pin single inline berg.
MegaDual uses AMIBIOS setup to control CPU speed. If the CPU speed is set too high
(above the CPU stamped speed), the system might not boot. If the system does not boot,
perform the following procedure:
Step
1 Turn the power off.
2 Plug the JP1 jumper.
3 Turn the power on.
The system will boot in safe mode at 200 MHz CPU speed.
4 Turn the power off.
5 Remove the jumper.
6 Turn the power on.
7 Press <Del> to enter Setup.
8 Configure the correct CPU speed.
18 MegaDual PCI Motherboard User's Guide
Continued
Pin Signal Description
1 VCC
2 Data+
3 Data–
4 Ground
Action
Cont'd