User’s Manual
Table Of Contents
1-5
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.
DO NOT short-circuit the pins except when clearing the RTC RAM. Short-circuiting or
placing a jumper cap will cause system boot failure!
If the steps above do not help, remove the onboard button cell battery and short the two
pins again to clear the CMOS RTC RAM data. After clearing the CMOS, reinstall the button
cell battery.
12. COM Port header
The COM (Serial) Port header allows you to connect a COM port module.
Connect the COM port module cable to this header, then install the module
to a slot opening on the system chassis.
The COM port module is purchased separately.
13. COM Debug header
This header allows connection to a COM Debug card.
The COM Debug Card is purchased separately.
14. Front Panel Audio header
The Front Panel Audio header is for a chassis-mounted front panel audio
I/O module that supports HD Audio. Connect one end of the front panel
audio I/O module cable to this header.
We recommend that you connect a high-denition front panel audio
module to this header to avail of the motherboard’s high-denition
audio capability.
15. LPT header
The LPT (Line Printing Terminal) header supports devices such as a
printer. LPT standardizes as IEEE 1284, which is the parallel port interface
on IBM PC-compatible computers.
16. System Management Bus header
The System Management Bus (SMBus) connector allows you to connect a
SMBus device. This connector is generally used for communication with the
system and power management-related tasks.
COM
PIN 1
DCD
TXD
GND
RTS
RI
RXD
DTR
DSR
CTS
PIN 1
SOUTC_P80
+3V
GND
GND
O_COM1_TXD1
COM_DEBUG
PORT1L
PORT1R
PORT2R
SENSE_SEND
PORT2L
AGND
NC
SENSE1_RETUR
SENSE2_RETUR
AAFP
PIN 1
HD-audio-compliant
pin definition
PIN 1
O_LPT_XSTB#_R
O_LPT_XPD0_R
O_LPT_XPD1_R
O_LPT_XPD2_R
O_LPT_XPD3_R
O_LPT_XPD4_R
O_LPT_XPD5_R
O_LPT_XPD6_R
O_LPT_XPD7_R
O_LPT_ACK#_R
O_LPT_BUSY_R
O_LPT_PE_R
O_LPT_SLCT_R
O_LPT_XAFD#_R
O_LPT_ERROR#_R
O_LPT_XINIT#_R
O_LPT_XSLIN#_R
GND
GND
GND
GND
GND
GND
GND
GND
LPT
PIN 1
SMBUS
GND
SMBUS_CLK
SMBUS_DATA
Pro A620M-C