Intel Socket 478 AIMB-744 - Manual (Page 26)

AIMB-744 User’s Manual 12
1.8 Jumper Settings
This section provides instructions on how to configure your motherboard
by setting the jumpers. It also includes the motherboards's default settings
and your options for each jumper.
1.8.1 How to set jumpers
You can configure your motherboard to match the needs of your applica-
tion by setting the jumpers. A jumper is a metal bridge that closes an elec-
trical circuit. It consists of two metal pins and a small metal clip (often
protected by a plastic cover) that slides over the pins to connect them. To
“close” (or turn ON) a jumper, you connect the pins with the clip. To
“open” (or turn OFF) a jumper, you remove the clip. Sometimes a jumper
consists of a set of three pins, labeled 1, 2, and 3. In this case you connect
either pins 1 and 2, or 2 and 3. A pair of needle-nose pliers may be useful
when setting jumpers.
1.8.2 CMOS clear (J1)
The AIMB-744 motherboard contains a jumper that can erase CMOS
data and reset the system BIOS information. Normally this jumper should
be set with pins 1-2 closed. If you want to reset the CMOS data, set J1 to
2-3 closed for just a few seconds, and then move the jumper back to 1-2
closed. This procedure will reset the CMOS to its default setting.
1.8.3 Watchdog timer output (J2)
The AIMB-744 contains a watchdog timer that will reset the CPU or send
a signal to IRQ11 in the event the CPU stops processing. This feature
means the AIMB-744 will recover from a software failure or an EMI
Table 1.3: CMOS (J1)
Function Jumper Setting
* Keep CMOS data
Clear CMOS data
* default setting
1-2 closed
2-3 closed