MSI B75MA-E21 Serie Mode D'emploi page 22

JCoM: Serial port Connector
this connector is a 6550A high speed communication port that sends/receives
6 bytes FiFos. you can attach a serial device.
JBAt: Clear CMoS Jumper
there is CMoS rAM onboard that is external powered from a battery located on
the mainboard to save system configuration data. With the CMoS rAM, the sys-
tem can automatically boot into the operating system (oS) every time it is turned
on. if you want to clear the system configuration, set the jumper to clear the CMoS
rAM.
iMportANt
you can clear the CMoS rAM by shorting this jumper while the system is off.
Afterwards, open the jumper . do not clear the CMoS rAM while the system is on
because it will damage the mainboard.
JuSB_pW: uSB power Jumper
this jumper allows you to enable/ disable the "Wakeup from S3/S4/S5 by uSB
and pS/2 device" function.
JuSB_pW
iMportANt
if you set the jumper to Enabled, the power supply must be able to provide +5VSB
and at least 2A currents.
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keep data

disabled
Clear data

Enabled