Acer Extensa 900 Series User manual
System Board
System Board 1-1
1.1 Features
This high-performance system board is designed to support the Intel
P54C and P55C CPUs running at 75/100/120/133/150/166/200 MHz.
It utilizes both the EISA and the PCI local bus architecture. Three
EISA and four PCI bus slots reside on the board to allow installation
of either master or slave devices, except for one PCI slot that
supports only slave devices.
The board has three memory banks composed of two 72-pin SIMM
sockets each that support a maximum system memory of 192 MB
using 32-MB SIMMs. The SIMM sockets support both EDO and fast-
page mode SIMMs. A second-level cache socket is available for a
256-KB or 512-KB synchronous SRAM module.
A 50-pin Fast SCSI-II interface with 10 MB/s transfer rate and a 68-
pin Wide SCSI interface that transfers at 20 MB/s (Wide SCSI) and
40 MB/s (Ultra SCSI) come with the system board to connect SCSI
devices. Standard I/O features such as two serial interfaces (COM1,
COM2), one parallel port interface, an IDE drive interface, a diskette
drive interface, and PS/2 mouse and keyboard connectors reside on
the system board.
The system board supports two optional features, the ASM Pro and
the Remote Diagnostic Management (RDM) for better server
management. These features maximize the system operating time
by minimizing the downtime.
1-2 User’s Guide
1.2 Major Components
The system board has the following major components:
•One zero-insertion force (ZIF) socket for Intel P54C or P55C
CPU
•Three memory banks (Bank 1 to Bank 3) composed of six 72-pin
SIMM sockets
•Synchronous cache module socket that supports 256 KB and
512 KB second-level cache
•Three EISA and four PCI expansion slots
•256-KB Flash ROM for system BIOS
•RTC chip that contains clock/calendar plus 128 bytes CMOS
RAM with battery backup
•50-pin Fast SCSI-II and 68-pin Wide SCSI interfaces
•Two 24-pin RDM interfaces
•IDE hard disk and diskette drive interfaces
•Onboard VRAM plus a VRAM socket for video memory upgrade
•Power connector for 200-watt switching power supply
•I/O, SCSI, VGA, memory, and ASM Pro controller chipsets
•External ports:
•PS/2-compatible keyboard port
•PS/2-compatible mouse port
System Board 1-3
1.2.1 System Board Layout
1 PS/2 keyboard connector
2 PS/2 mouse connector
3 PCI slots
4 Keyboard controller
5 EISA slots
6 Video RAM
7 Video RAM upgrade socket
8 CPU voltage regulator
9 Buzzer
10 CPU socket
11 CPU voltage regulator
12 Cache module socket
13 SIMM sockets
Figure 1-1 System Board Layout
12
4
3
5
67
9
13 10
8
11
12
1-4 User’s Guide
1.3 Jumpers and Connectors
1.3.1 Jumper and Connector Locations
Figure 1-2 shows the jumper locations on the system board. The
blackened pin on a jumper represents pin 1.
Figure 1-2 Jumper Locations
Jumpers are prefixed “JP”. Connectors are
prefixed “CN”. FA1 to FA5 are fan
connectors.
The blackened pin of a jumper represents
pin 1.
System Board 1-5
1.3.2 Jumper Settings
Table 1-1 Jumper Settings
Jumper Setting Function
CPU Voltage
JP1 1-2
2-3*VR
VRE
Cache Size
JP3 1-2*
2-3 256 KB
512 KB
BIOS Version
JP8 1-2*
2-3 Acer
Generic
Password Security
JP9 1-2
2-3* Enabled
Bypass
PC Sound Source
JP10 1-2*
2-3 Buzzer
Speaker
Front Panel Reset
JP11 1-2*
2-3 Enabled
Disabled
CPU Type
JP17, JP18, JP19 1-2
2-3* P55C CPU
P54C CPU
SCSI Selection
JP20 1-2*
2-3
4-5
PCI device ID is 11 Hex
PCI device ID is 0C Hex
Disabled
Onboard VGA
JP23 1-2*
2-3 Enabled
Disabled
*Default setting
1-6 User’s Guide
Table 1-1 Jumper Settings (continued)
Jumper Setting Function
SCSI Termination
JP24 1-2*
2-3 High-byte terminator ON
High-byte terminator OFF
Core/Bus Freq.
JP4, JP5, JP7
JP4 JP5 JP7
2-3 2-3 1-2
1-2 1-2 2-3
2-3 1-2 2-3
2-3 2-3 2-3
1-2 2-3 3-4
1-2 1-2 3-4
2-3 1-2 3-4
2-3 2-3 3-4
Bus Freq. Core Freq. Ratio
50 MHz 75 MHz 3/2
60 MHz 150 MHz 5/2
60 MHz 120 MHz 2/1
60 MHz 90 MHz 3/2
66 MHz 200 MHz 3/1
66 MHz 166 MHz 5/2
66 MHz 133 MHz 2/1
66 MHz 100 MHz 3/2
System Board 1-7
1.3.3 Connector Functions
Table 1-2 lists the different connectors on the system board and their
respective functions.
Table 1-2 Connector Functions
Connector Function
CN1 COM1
CN2 COM2
CN3 Power connector for 200-watt SPS
CN4 Power connector for 300-watt SPS
CN5 Parallel port connector
CN6 Diskette drive connector
CN7 IDE drives connector
CN8 Remote diagnostic module (RDM) connector
CN9 Remote diagnostic module (RDM) connector
CN10 Faulty-drive LED connector
CN11 Fast SCSI-II (narrow SCSI) connector
CN12 Wide SCSI connector
CN13 VGA daughter board connector
CN15 Power LED and keylock connector
CN16 Hard disk LED connector
CN17 Speaker connector
CN18 Reset/Turbo connector
1-8 User’s Guide
1.4 ESD Precautions
Always observe the following ESD (electrostatic discharge)
precautions before installing any system component:
1. Do not remove any system component from its packaging unless
you are ready to install it.
2. Wear a wrist grounding strap before handling electronic
components. Wrist grounding straps are available at most
electronic component stores.
DO NOT attempt the procedures in the
following sections unless you are confident of
your capability to perform them. Otherwise,
ask a service technician for assistance.
System Board 1-9
1.5 Installing a VGA Daughter Board
The system board comes with a video controller, a video connector,
and a VGA daughter board. These components save you the trouble
of buying a video board and save one bus slot for another expansion
board. The daughter board carries an external video port.
To install, simply plug-in the daughter board into CN13 and secure
the bracket with a screw.
Figure 1-4 Installing a VGA Daughter Board
External VGA Port
VGA Connector
(CN13)
1-10 User’s Guide
1.6 CPU Upgrade
The system board comes with a zero-insertion force (ZIF) CPU socket
for easy installation.
Follow these steps to install a Pentium CPU:
1. Pull up the socket lever.
2. Insert the CPU, making sure that the pin 1 of the CPU connects
to pin 1 of the socket.
Be careful not to bend any pins.
3. Pull down the socket lever.
Figure 1-5 Installing a Pentium CPU
STEP 1
STEP 2
STEP 3
Notched Corner
Pin 1 Indicator
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