Acer 700ed User manual

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System Board

System Board 1-1

This high-performance system board supports both the 486-series

and the Intel Pentiummicroprocessors. The board does not include

the CPU and the second-level cache. Instead, it accommodates a

separate board that carries both the CPU and the second-level cache.

This feature allows maximum upgradability and flexibility.

The board features the single-chip upgrade technology that makes

CPU upgrades easy and economical, and also the multiple-CPU

upgrade technology that can convert your machine into a

multiprocessor system. These innovative technologies protect your

investment well into the future.

Standard features such as two serial ports, one parallel port, a

diskette drive interface, and an embedded fixed disk drive interface

reside on the system board.

The system board has a 8/16-MB base memory and supports a

maximum memory of 128 MB using 32-MB SIMMs. When you install

the dual-Pentium (3.3V) CPU board, you get four additional SIMM

sockets for a total system memory of 256 MB using 32-MB SIMMs.

When you install the Pentium (3.3V-ECC) CPU board, you get two

additional SIMM sockets that support a maximum memory of 64 MB

using 32-MB SIMMs, for a total system memory of 192 MB.

1-2 User’s Guide

1.1 Major Components

The system board has the following major components:

•Four 72-pin SIMM sockets labeled Bank 0 and Bank 1 (two

sockets comprise one bank)

•One CPU board slot

•Five 32-bit EISA expansion slots supporting master/slave add-on

cards

•Three PCI local bus slots

•128/256-KB Flash memory for easy system BIOS upgrade

•I/O interfaces for two serial ports, one parallel port, diskette

drives, IDE drives, and PS/2 keyboard and mouse

•Enhanced IDE on PCI bus supports two IDE ports for four IDE

devices (IDE models)

•Onboard AIC-7870 chip supports one 8-bit Fast SCSI-II port

(SCSI models)

•Power connector 1 for 200-watt/350-watt switching power supply

(for ID3P and IDAB housings)

•Power connector 2 for 350-watt switching power supply

(additional connector for models using IDU housing)

Figure 1-1 shows the location of the major components on the board.

System Board 1-3

1 COM 2

2 COM 1

3 Parallel port interface

4 Diskette drive interface

5 IDE hard disk drive interface

6 Power connector 1

(200/350-watt)

7 SIMM sockets

8 Power connector 2 (350-watt)

9 Wide SCSI interface

10 Fast SCSI-2 interface

11 CPU board slot

12 Power LED connector

13 Hard disk LED connector

14 Fan connectors

15 Turbo/Reset connector (J23)

16 Speaker connector (J24)

17 Real-time clock

18 BIOS

19 EISA expansion slots

20 PCI slots

21 PS/2 mouse connector

22 PS/2 keyboard connector

Figure 1-1 System Board Layout

1-4 User’s Guide

1.2 ESD Precautions

Always observe the following precautions before installing any system

component:

1. Do not remove a board 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.

1.3 Upgrading the Memory

The system comes with a standard 8/16-MB memory, expandable up

to 128 MB, 192 MB, or 256 MB depending on the type of CPU board

installed. You can upgrade the system memory by installing single

inline memory modules (SIMMs) into the SIMM sockets or by

changing the SIMMs for a higher memory configuration. The four 72-

pin SIMM sockets support 4-MB and 16-MB single-density as well as

8-MB and 32-MB double-density SIMMs.

1.3.1 Rules for Adding Memory

•Always install SIMMs from the lowest bank first. For example,

use bank 0 before bank 1, bank 1 before bank 2, and so on.

•Always remove SIMMs from the highest bank first. For example,

bank 3 before bank 2, and so on.

•Use only the same type of SIMM in a given bank

•You may combine different types of SIMMs for a particular

memory configuration as long as the SIMMs in each bank are of

the same type.

System Board 1-5

Table 1-1 lists the available memory configurations when the system

uses either an IntelDX4, Pentium (5V), single-Pentium (3.3V), or a

Pentium (3.3V-ALI) CPU board.

Table 1-1 Memory Configurations

Bank 0 Bank 1 Total

S0 S1 S0 S1 Memory

4 MB 4 MB 8 MB

4 MB 4 MB 4 MB 4 MB 16 MB

8 MB 8 MB 16 MB

8 MB 8 MB 4 MB 4 MB 24 MB

4 MB 4 MB 8 MB 8 MB 24 MB

8 MB 8 MB 8 MB 8 MB 32 MB

16 MB 16 MB 32 MB

16 MB 16 MB 4 MB 4 MB 40 MB

4 MB 4 MB 16 MB 16 MB 40 MB

16 MB 16 MB 8 MB 8 MB 48 MB

8 MB 8 MB 16 MB 16 MB 48 MB

16 MB 16 MB 16 MB 16 MB 64 MB

32 MB 32 MB 64 MB

32 MB 32 MB 4 MB 4 MB 72 MB

4 MB 4 MB 32 MB 32 MB 72 MB

32 MB 32 MB 8 MB 8 MB 80 MB

8 MB 8 MB 32 MB 32 MB 80 MB

32 MB 32 MB 16 MB 16 MB 96 MB

16 MB 16 MB 32 MB 32 MB 96 MB

32 MB 32 MB 32 MB 32 MB 128 MB

* S0 and S1 stand for socket 0 and socket 1 respectively.

1When using the IntelDX4, Pentium (5V), single-Pentium (3.3V), and

Pentium (3.3V-ALI) CPU boards

1-6 User’s Guide

Models using the dual-Pentium (3.3V) CPU board, four additional

72-pin SIMM sockets are available. With the additional sockets, you

can upgrade the memory up to 256 MB using 32-MB SIMMs.

Table 1-2 lists some of the possible memory configurations when a

dual-Pentium (3.3V) CPU board is installed.

Banks 0 and 1 are on the system board;

banks 2 and 3 are on the dual-

Pentium (3.3V) CPU board.

Table 1-2 Some Possible Memory Configurations when Using

the Dual-Pentium (3.3V) CPU Board

Bank 0 Bank 1 Bank 2 Bank 3 Total

S0 S1 S0 S1 S0 S1 S0 S1 Memory

4 MB 4 MB 8 MB

4 MB 4 MB 8 MB 8 MB 24 MB

4 MB 4 MB 8 MB 8 MB 16 MB 16 MB 56 MB

4 MB 4 MB 8 MB 8 MB 16 MB 16 MB 32 MB 32 MB 120 MB

4 MB 4 MB 4 MB 4 MB 16 MB

8 MB 8 MB 8 MB 8 MB 8 MB 8 MB 48 MB

16 MB 16 MB 16 MB 16 MB 32 MB 32 MB 32 MB 32 MB 192 MB

32 MB 32 MB 32 MB 32 MB 32 MB 32 MB 32 MB 32 MB 256 MB

* S0 and S1 stand for socket 0 and socket 1 respectively.

The above configurations are only some of

the available memory combinations. You

can use other combinations as long as you

follow the rules when upgrading memory.

Refer to section 1.3.1.

System Board 1-7

Models using the Pentium (3.3V-ECC) CPU board have two

additional 72-pin SIMM sockets. With the additional sockets, you can

upgrade the memory to 192 MB using 32-MB SIMMs.

Table 1-3 lists some of the possible memory configurations when a

Pentium (3.3V-ECC) CPU board is installed.

Banks 0 and 1 are on the system board;

bank 2 is on the Pentium (3.3V-ECC) CPU

board.

Table 1-3 Some Possible Memory Configurations when Using

the Pentium (3.3V-ECC) CPU Board

Bank 0 Bank 1 Bank 2 Total

S0 S1 S0 S1 S0 S1 Memory

4 MB 4 MB 8 MB

4 MB 4 MB 8 MB 8 MB 24 MB

4 MB 4 MB 8 MB 8 MB 16 MB 16 MB 56 MB

8 MB 8 MB 16 MB 16 MB 32 MB 32 MB 112 MB

4 MB 4 MB 4 MB 4 MB 4 MB 4 MB 24 MB

8 MB 8 MB 8 MB 8 MB 8 MB 8 MB 48 MB

16 MB 16 MB 16 MB 16 MB 16 MB 16 MB 96 MB

32 MB 32 MB 32 MB 32 MB 32 MB 32 MB 192 MB

* S0 and S1 stand for socket 0 and socket 1 respectively.

The above configurations are only some of

the available memory combinations. You

can use other combinations as long as you

follow the rules when upgrading memory.

Refer to section 1.3.1.

1-8 User’s Guide

1.3.2 Installing SIMMs

Read the ESD precautions in section 1.2

before proceeding.

Follow these steps to install a SIMM:

1. Slip a SIMM at a 45oangle into a socket with the component side

facing down.

2. Gently push the SIMM to a vertical position until the pegs of the

socket slip into the holes on the SIMM, and the holding clips lock

the SIMM into position. The SIMM should be at a 90oangle

when installed.

Figure 1-2 Installing a SIMM

Always install SIMMs starting with Bank 0

and in pairs. For example, for a total

memory of 8 MB, install two 4-MB SIMMs in

sockets 0 and 1 of Bank 0. You can not use

an 8-MB SIMM alone for an 8-MB memory.

Peg

Hole

Clip

System Board 1-9

1.3.3 Removing SIMMs

Follow these steps to remove SIMMs:

1. Press the holding clips on both sides of the SIMM outward to

release it.

2. Push the SIMM downward to a 45oangle.

3. Pull the SIMM out of the socket.

1.3.4 Reconfiguring the System

Reconfigure the system after installing or removing SIMMs.

Follow these steps to reconfigure the system:

1. Reboot the system. A memory error message appears,

indicating that the total memory does not match the value stored

in CMOS.

2. Press







to run Setup. A message indicating a

wrong memory configuration appears.

3. Press



twice to exit Setup and reboot the system. The

system boots with the new memory configuration.

1-10 User’s Guide

1.4 SCSI Feature

The system board features a single-chip SCSI host adapter that adds

SCSI I/O capability to the system. The chipset consists of an onboard

microcontroller, bus master interface controller, and SCSI controllers.

A 50-pin Fast SCSI-2 interface with 10 MB/s transfer rate and a 68-

pin Wide SCSI interface that transfers at 20 MB/s also come with the

board to accommodate the SCSI devices.

Before connecting any SCSI device to the 68-pin interface, connect a

Wide SCSI daughter board that has a compact 68-pin SCSI

connector. Figure 1-3 illustrates the daughter board.

1. 68-pin compact SCSI connector

2. 68-pin Wide SCSI connector (female)

Figure 1-3 Wide SCSI Daughter Board

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