Asus PRIME Q270M-C/CSM User Guide - Page 12
To erase the RTC RAM, LPC Debug header
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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 key during the boot process and enter BIOS setup to re-enter data. +3V_BAT GND CLRTC PIN 1 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 PCcompatible 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-definition front panel audio module to this connector to avail of the motherboard's high-definition 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 specifications. 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 specifications. 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 specifications. 1-4 Chapter 1: Product introduction