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11. PC99 Color Coded Back Panel
The onboard I/O devices are PS/2 Keyboard, PS/2 Mouse, COM1/Com2, Printer and
USB2.0. The view angle of drawing shown here is from the back panel of the housing.
PS/2 Mouse
SPP/EPP/ECP Parallel Port
Connector
USB2.0
Port
PS/2 Keyboard
COM 2 Port
Connector
PS/2 Keyboard:
For standard keyboard, which is using a PS/2 plug.
PS/2 Mouse:
For PC-Mouse, which is using a PS/2 plug.
USB2.0 Port:
Available for connecting USB devices.
Parallel Port:
To connect with SPP/ECP/EPP printer.
COM1/COM2:
To connect with pointing devices, modem or others serial devices.
1GbE Ethernet Port: To connect RJ-45 Ethernet Cable.
Speaker Out:
To External Speaker, Earphone or Amplifier. (Support 5.1 Channel)
Line-In:
Comes from the signal sources, such as CD/Tape player. (Support 5.1 Channel)
MIC-In:
From Microphone. (Support 5.1 Channel)
12. S/PDIF (Sony/Philips Digital Interface) Connector
S/PDIF (Sony/Philips Digital Interface) is a newest audio transfer file format, which provides
impressive audio quality through optical fiber and allows you to enjoy digital audio instead of
analog audio. Normally there are two S/PDIF outputs as shown, one for RCA connector, the
most common one used for consumer audio products, and the other for optical connector
with better audio quality. Through a specific audio cable, you can connect the S/PDIF
connector to other end of the S/PDIF audio module, which bears S/PDIF digital output.
However, you must have a S/PDIF supported speaker/amplifier/decoder with S/PDIF digital
input to connect to the S/PDIF digital output to make the most out of this function.
(RCA)
S/PDIF
S/PDIF OUT
Cable
S/PDIF IN
S/PDIF OUT
+5VSB
1
S/PDIF IN
NC
(Optical)
S/PDIFOUT
GND
S/PDIF Module
S/PDIFIN
(User Upgrade Optional)
1 GbE
Ethernet
Port
MIC-IN
(CENTER/LFE)
Line-IN
(SURROUND)
Speaker- OUT
USB2.0
COM 1 Port
Port
13. Support 1Gbps LAN onboard
The Intel 82545EM integrates Intel's fourth-generation Gigabit MAC design with fully
integrated, physical-layer circuitry to provide a standard IEEE 802.3 Ethernet interface for
1000BASE-T and 100BASE-TX applications. The right green LED indicates the link mode,
it lights when linking to network and blinking when transferring data in 100Mbps mode. The
left yellow LED indicates the transfer mode, and it lights when data is transferring in 1Gbps
mode.
14. Support the 3rd USB2.0 Channel
This motherboard provides three USB channels to link USB devices, such as mouse,
keyboard, modem, printer, etc. There are two connectors on the PC99 back panel. You can
use proper cable to connect other USB connectors to the back panel or front panel of
chassis.
1 2
2
+5V
+5V
SBD2-
SBD3-
SBD2+
SBD3+
GND
GND
KEY
Yellow/1G
Green/link/100
1Gb Ethernet Port
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