Asus PRIME Q270M-C/CSM - Expansion Slots and External Interfaces; Debug, Serial, and Audio Connectors; PCI and PCIe Expansion Slots

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Chapter 1: Product introduction
To erase the RTC RAM:
1. Turn OFF the computer and unplug the power
cord.
2. Use a metal object such as a screwdriver to
short the two pins.
3. Plug the power cord and turn ON the computer.
4. Hold down the <Del> key during the boot
process and enter BIOS setup to re-enter data.
If the steps above do not help, remove the onboard battery and short the two pins again
to clear the CMOS RTC RAM data. After clearing the CMOS, reinstall the battery.
LPC Debug header
This header allows connection to a LPC debug card.
LPT connector (26-1 pin LPT)
The LPT (Line Printing Terminal) connector supports devices such as a printer.
LPT standardizes as IEEE 1284, which is the parallel port interface on IBM PC-
compatible computers.
Serial port connectors (10-1 pin COM)
Connect the serial port module cable to these connectors, then install the module
to a slot opening at the back of the system chassis.
Front panel audio connector (10-1 pin AAFP)
This connector is for a chassis-mounted front panel audio I/O module that supports
HD Audio standard. Connect one end of the front panel audio I/O module cable to
this connector.
We recommend that you connect a high-denition front panel audio module to this
connector to avail of the motherboard’s high-denition audio capability.
PCI slot
The PCI slot supports cards such as a LAN card, SCSI card, USB card, and other
cards that comply with PCI specications.
Mono out header (2-pin MONO_OUT)
This internal mono out header allows connection to an internal, low power speaker
for basic system sound capability. The subsystem is capable of driving a speaker
load of 2 Ohms at 2 Watts (rms).
PCI Express 3.0/2.0 x1 slots
This motherboard supports two PCI Express x1 network cards, SCSI cards, and
other cards that comply with the PCI Express specications.
PCI Express 3.0/2.0 x16 slot
This motherboard has a PCI Express 3.0/2.0 x16 slot that supports PCI Express
3.0/2.0 x16 graphic cards complying with the PCI Express specications.
CLRTC
+3V_BAT GND
PIN 1