Datasheet

5-18
SUPERWORKSTATION 7033A-T Manual
5-9 Jumper Settings
Explanation of
Jumpers
To modify the operation of the
motherboard, jumpers can be
used to choose between
optional settings. Jumpers
create shorts between two pins
to change the function of the
connector. Pin 1 is identified
with a square solder pad on
the printed circuit board. See
the motherboard layout page
for jumper locations.
Note: On two pin jumpers,
"Closed" means the jumper is
on and "Open" means the
jumper is off the pins.
Connector
Pins
Jumper
Cap
Setting
Pin 1-2 short
3 2 1
3 2 1
CMOS Clear
JBT1 is used to clear CMOS. Instead of pins, this "jumper" consists of
contact pads to prevent the accidental clearing of CMOS. To clear CMOS,
use a metal object such as a small screwdriver to touch both pads at the
same time to short the connection. Always remove the AC power cord
from the system before clearing CMOS. JBT1 is located near the FPUSB0/
1 headers on the motherboard.
Note: For an ATX power supply, you must completely shut down the sys-
tem, remove the AC power cord and then short JBT1 to clear CMOS. Do
not use the PW_ON connector to clear CMOS.
System Bus Speed
JP39 allows you to select Auto, 400
or 533 MHz for your system (front
side) bus speed. The recommended
Auto setting will automatically deter-
mine the system bus speed of your
processor(s). See the table on the
right for jumper settings.
"Auto" is the recommended setting.
Jumper
Position
Pins 1-2
Pins 2-3
Open
Definition
Auto
400 MHz
533 MHz
System Bus Speed
Jumper Settings (JP39)