ECS NM70-M User Manual page 20

4. CASE: Chassis Intrusion Detect Header
This detects if the chassis cover has been removed. This function needs a chassis
equipped with instrusion detection switch and needs to be enabled in BIOS.
5. F_USB1~2: Front Panel USB 2.0 Headers
The motherboard has two USB 2.0 headers supporting four USB 2.0 ports.
Additionally, some computer cases have USB 2.0 ports at the front of the case. If you
have this kind of case, use auxiliary USB 2.0 connector to connect the front-mounted
ports to the motherboard.
Please make sure that the USB cable has the same pin assignment as
indicated above. A different pin assignment may cause damage or system
hang-up.
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NM70-M USER MANUAL