ASROCK 939A8X-M, Installation Manual

Page: 11 / 100

1 1 1 1 1 1 1 1 1 1
ASRock 939A8X-M Motherboard
2.4 Jumpers Setup 2.4 Jumpers Setup
2.4 Jumpers Setup 2.4 Jumpers Setup
2.4 Jumpers Setup
The illustration shows how jumpers are
setup. When the jumper cap is placed on
pins, the jumper is “Short”. If no jumper cap
is placed on the pins, the jumper is “Open”.
The illustration shows a 3-pin jumper whose
pin1 and pin2 are “Short” when jumper cap
is placed on these 2 pins.
Jumper Setting
PS2_USB_PWR1 Short pin2, pin3 to enable
(see p.2 item 1)
+5VSB (standby) for PS/2
or USB wake up events.
Note: To 5VSB, it requires 2 Amp and higher standby current provided by
power supply.
JR1 / JL1 Jumpers
(see p.2 item 20)
Note: If JR1 and JL1 Jumpers are short, both the front panel and the rear panel
audio connectors can work.
Clear CMOS Jumper
(CLRTC1)
(see p.2 item 10)
Note: CLRTC1 allows you to clear the data in CMOS. The data in CMOS includes
system setup information such as system password, date, time, and system
setup parameters. To clear and reset the system parameters to default setup,
please turn off the computer and unplug the power cord from the power
supply. After waiting for 15 seconds, use a jumper cap to short pin2 and pin3
on CLRTC1 for 5 seconds. However, please do not clear the CMOS right after
you update the BIOS. If you need to clear the CMOS when you just finish
updating the BIOS, you must boot up the system first, and then shut it down
before you do the clear-CMOS action.
Short Open
Clear CMOS Default
EnglishEnglishEnglishEnglishEnglish