Acer M1A Manuale utente

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System Board

System Board 1-1

The M1A is a high-performance Pentium PCI-based system board

that supports the 64-bit Pentium microprocessor running at

75/90/100/120/133/150/166 MHz and has a 16-KB internal write-back

cache. It utilizes the Peripheral Component Interconnect (PCI) local

bus architecture. The PCI local bus maximizes the system

performance by enabling high-speed peripherals to match the speed

of the microprocessor with its 100/120/132 MB per second transfer

rate in burst mode.

The board has two memory banks composed of two 72-pin SIMM

sockets each that support a maximum system memory of 128 MB

using 32-MB SIMMs. The onboard 1-MB video memory is

upgradable to 2 MB for a higher video resolution.

The system board features a slot for the PCI/ISA slot board and two

Mode 4 PCI enhanced IDE interfaces that support up to four IDE

devices. A 50-pin Fast SCSI-II interface with 10 MB/s transfer rate

come with the system board to connect SCSI devices.

Standard I/O features such as two serial ports (COM1, COM2), one

parallel port, a diskette drive interface, and PS/2 mouse and keyboard

connectors reside on the system board.

1-2 User’s Guide

1.1 Major Features

The system board has the following major features:

•Pentium 75/90/100/120/133/150/166 MHz CPU in an SPGA 296-

pin zero-insertion force (ZIF) socket

•Two DRAM banks composed of four 72-pin SIMM sockets that

support 4/8/16/32-MB 60/70ns SIMMs

•16-KB internal cache (CPU)

•256-KB synchronous or asynchronous second-level cache

•128-KB Flash ROM for system BIOS and VGA BIOS

•EISA-type connector for the slot board that contains two PCI and

three ISA slots (for desktop housing) or three PCI and 5 ISA slots

(for minitower housing)

•Two Enhanced IDE interfaces that support up to

four IDE devices

•System clock/calendar with 128/256 bytes CMOS RAM

•External ports:

•PS/2 keyboard/mouse ports

•Two buffered high-speed serial ports

•One ECP/EPP high-speed parallel port

•Video port

•RJ-45 Ethernet connector

System Board 1-3

1.1.1 Layout

Figure 1-1 shows the locations of the system board major

components.

1 Keyboard controller

2 Real-time clock (RTC)

3 Flash ROM BIOS

4 Buzzer

5 Fan connectors

6 SIMM sockets

7 CPU socket

8 Synchronous cache (optional)

9 CPU voltage regulator

10 Asynchronous cache

11 VGA BIOS

12 Video upgrade sockets

13 Video RAM

14 Video port

15 Parallel port

16 COM 2

17 Slot board connector

18 COM 1

19 PS/2 mouse connector

20 PS/2 keyboard connector

21 RJ-45 connector

Figure 1-1 System Board Layout

1For SCSI models only

1-4 User’s Guide

1.1.2 Slot Board

The system board comes with a slot board already installed. The slot

board carries two PCI and three ISA bus slots for system

enhancements and future expansion.

The slot board may vary in size and layout depending on your system

housing. Figures 1-2 and 1-3 show the two kinds of slot boards.

Figure 1-2 2-PCI/3-ISA Slot Board (for desktop systems)

Figure 1-3 3-PCI/5-ISA Slot Board (for minitower systems)

System Board 1-5

1.2 Jumpers and Connectors

1.2.1 Jumper and Connector Locations

Figure 1-4 shows the jumper and connector locations on the system

board.

Figure 1-4 System Board Jumper and Connector Locations

Jumpers are prefixed “JP”. Connectors are

prefixed “CN”.

The blackened pin of a jumper represents

pin 1.

1-6 User’s Guide

1.2.2 Jumper Settings

Table 1-1 lists the system board jumpers with their corresponding

settings and functions.

Table 1-1 System Board Jumper Settings

Jumper Setting Function

BIOS Type

JP1 1-2

2-3 For models with Acer BIOS

For models with OEM BIOS

Password Security

JP2 1-2

2-3 Enable password

Disable password

CPU Bus Frequency

JP5 Open

1-2

2-3

50 MHz (Pentium 75 MHz)

60 MHz (Pentium 90/120/150 MHz)

66 MHz (Pentium 100/133/166

MHz)

CPU Voltage

JP7 1-2

2-3 VR (3.3V ± 5% - 0%)

VRE (3.45V ~ 3.6V)

Reserved

JP9 2-3* Fixed setting. Do not reconfigure.

Reserved

JP14 Open* Leave open. Do not reconfigure.

System Board 1-7

Table 1-1 System Board Jumper Settings (continued)

Jumper Setting Function

CPU Type

JX1, JP8

JP10

JP11

JP12

JP13

2-3, 1-2

2-3, 2-3

1-2, 1-2

1-2, 2-3

Intel P54C M1 K5

C/B=3/1

C/B=5/2

C/B=3/2 C/B=3/1 C/B=3/2, 3/3

C/B=2/1 C/B=2/1 C/B=1/1

On Off On

On Off Off

On Off On

1.2.3 Connector Functions

Table 1-2 lists the different connectors on the system board and their

respective functions.

Table 1-2 Connector Functions

Connector Function

CN4 Attachment Unit Interface (AUI)

CN5 Feature connector

CN6 Diskette drive connector

CN7 Enhanced IDE 2

CN8 Enhanced IDE 1

CN9 Power connector

CN10 SCSI connector

CN11 Power LED connector

CN12 Multifunction connector

1-8 User’s Guide

Table 1-2 Connector Functions (continued)

Connector Function

CN13 HDD LED connector

CN14 Speaker connector

CN15 Multifucntion connector

CN16 Buzzer (pins 1-2)

Speaker (pins 2-3)

1.3 ESD Precautions

Always observe the following electrostatic discharge (ESD)

precautions before installing a system component:

1. Do not remove a component from its antistatic packaging until

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 described in

the following sections unless you are a

qualified technician.

System Board 1-9

1.4 Memory Upgrade

The system board comes with four 72-pin SIMM sockets that support

4-MB and 16-MB single-density SIMMs as well as 8-MB and 32-MB

double-density SIMMs. When using 32-MB SIMMs, the sockets

support a maximum system memory of 128 MB. Table 1-3 lists the

possible memory configurations.

1.4.1 Rules for Adding Memory

•Use only one type of SIMM in a given bank.

•You may combine different types of SIMMs for a memory

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

type.

•Always install SIMMs in pairs. For example, for a total memory

of 8 MB, install two 4-MB SIMMs into the sockets marked S5 and

S4 (bank 0) or S3 and S2 (bank 1). You can not use an 8-MB

SIMM alone for an 8-MB memory.

1-10 User’s Guide

1.4.2 Memory Configurations

Table 1-3 Memory Configurations

Bank 0 Bank 1 Total

S5 S4 S3 S2 Memory

4 MB 4 MB 8 MB

8 MB 8 MB 16 MB

4 MB 4 MB 4 MB 4 MB 16 MB

4 MB 4 MB 8 MB 8 MB 24 MB

8 MB 8 MB 4 MB 4 MB 24 MB

8 MB 8 MB 8 MB 8 MB 32 MB

16 MB 16 MB 32 MB

4 MB 4 MB 16 MB 16 MB 40 MB

16 MB 16 MB 4 MB 4 MB 40 MB

8 MB 8 MB 16 MB 16 MB 48 MB

16 MB 16 MB 8 MB 8 MB 48 MB

16 MB 16 MB 16 MB 16 MB 64 MB

32 MB 32 MB 64 MB

4 MB 4 MB 32 MB 32 MB 72 MB

32 MB 32 MB 4 MB 4 MB 72 MB

8 MB 8 MB 32 MB 32 MB 80 MB

32 MB 32 MB 8 MB 8 MB 80 MB

16 MB 16 MB 32 MB 32 MB 96 MB

32 MB 32 MB 16 MB 16 MB 96 MB

32 MB 32 MB 32 MB 32 MB 128 MB

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