Acer ACERPOWER 800 Annexe 1

& K DSWHU

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System Board

This high-performance system board features the 64-bit, 3.3V Intel
Pentium CPUs running at speeds of 75/50, 90/60, 100/66, 120/60,
133/66, 150/60 or 166/66 MHz. It utilizes the Peripheral Component
Interconnect (PCI) local bus architec ture and integrates an enhanced
PCI IDE controller. The PCI local bus operates at 25, 30, or 33 MHz.

The system board has four ISA and f our PCI ex pansion slots, with one
PCI- and ISA-shared slot. The m emor y size is expandable to 128 MB
by adding single in-line memory modules (SIMMs). The system
supports first-level write-back cache and 256-KB second-level
pipeline-burst cache.

Standard features such as two serial ports, one parallel port, a diskette
drive interface, and an embedded f ixed dis k interf ace are incorporated
in the system board.

The system is fully compatible with MS-DOS V6.X, OS/2, UNIX,
Windows NT and Windows 95 operating systems.

System Board 1-1

1.1 System Board Layout

The system board has the following features and components:

Supports 3.3V Intel Pentium CPU (75/50 MHz, 90/60 MHz, 100/66

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MHz, 120/60 MHz, 133/66 MHz, 150/60 MHz, 166/66 MHz )
Integrates an enhanced PCI local-bus IDE controller

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128 MB maximum system memory

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Four 72-pin SIMM sockets that accept 4-, 8-, 16-, and 32-MB

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SIMMs
256-KB second-level cache (default) or optional cache upgrade

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socket for 256-KB pipeline-burst cache
Supports Extended Data Output (EDO) memory

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128-KB Flash ROM for system BIOS

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Four ISA- and four PCI-expansion slots (one PCI- and ISA-

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shared slot)
Dual 16C550 buffered serial ports and one ECP/EPP parallel port

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Plug-and-Play function

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Power-Management function

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Figure 1-1 shows the board layout and the locations of the important
components.

1-2 User’s Guide

1. Parallel port 11. Second-level cache

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2. COM 2 connector 12. ID3P LED connector

3. FDD connector 13. Multifunction connector

4. COM 1 connector 14. Real-time clock

5. IDE 2 connector 15. System BIOS

6. 5V power connector 16. Cache upgrade socket

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7. IDE 1 connector 17. ISA slots

8. SIMM sockets 18. PCI slots

9. ZIF-type CPU socket 19. Keyboard connector

10. Voltage regulator with heatsink

Figure 1-1 System Board Layout

The heatsink becomes very hot when the
system is on. NEVER touch the heatsink with
any metal or with your hands.

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Optional. The system board may come with either an onboard cache or a
cache upgrade socket.

System Board 1-3

The multifunction connector is 20-pin connector that accommodates
the LED and reset cables. Figure 1-2 shows the connector loc ation on
the system board and the cable connections.

Figure 1-2 Multifunction connector

1-4 User’s Guide

1.2 ESD Precautions

Electrostatic discharge (ESD) can damage your processor, disk drives,
expansion boards, and other components. Always observe the
following precautions before you install a system component.

1. Do not remove a component from its protective packaging until
you are ready to install it.

2. W ear a wrist grounding strap and attach it to a metal part of the
system unit before handling components . If a wrist strap is not
available, maintain contact with the system unit throughout any
procedure requiring ESD protection.

1.3 Pre-installation Instructions

Always observe the following before you install a system component:

1. Turn off the system power and all the peripherals connected to
the unit before opening it.

2. Open the system according to the instructions in the housing
installation manual.

3. Follow the ESD precautions in section 1.2 before handling a
system component.

4. Rem ove any expansion boards or peripherals that block access
to the SIMM sockets or CPU socket.

5. See the following sections for specific instructions on the
component you wish to install.

Do not attempt the procedures described in
the following sections unless you are a
qualified service technician.

System Board 1-5

1.4 Installing a CPU

Observe the ESD precautions when installing
components. See section 1.2.

The system board features a zero-inser tion forc e (ZIF) sock et f or eas y
CPU installation.

Follow these steps to install a 3.3V Intel Pentium CPU:

1. Pull up the socket lever.

2. Insert the CPU, m aking sure that pin 1 (indicated by a notched
corner) of the CPU connects to hole 1 of the socket.

3. Pull down the socket lever to lock the CPU into the socket.

Step 1

Step 2

Hole for Pin 1

Step 3

Notched corner

Figure 1-3 Installing a 3.3V Intel Pentium CPU

1-6 User’s Guide