Acer Extensa 900 Series User manual

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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

13 10

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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