Acer 486 User manual

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User’s Guide

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Copyright 1995 by this company. All rights reserved. No part of
this publication may be reproduced, transmitted, transcribed, stored in
a retrieval system, or translated into any language or computer
language, in any form or by any means, electronic, mechanical,
magnetic, optical, chemical, manual or otherwise, without the prior
written permission of this company.
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This company makes no representations or warranties, either
expressed or implied, with respect to the contents hereof and
specifically disclaims any warranties, merchantability or fitness for any
particular purpose. Any software described in this manual is sold or
licensed "as is". Should the programs prove defective following their
purchase, the buyer (and not this company, its distributor, or its dealer)
assumes the entire cost of all necessary servicing, repair, and any
incidental or consequential damages resulting from any defect in the
software. Further, this company reserves the right to revise this
publication and to make changes from time to time in the contents
hereof without obligation to notify any person of such revision or
changes.
Intel is a registered trademark of Intel Corporation.
IBM is a registered trademark and PS/2 is a trademark of International Business
Machines Corporation.
MS-DOS is a registered trademark of Microsoft Corporation.
Other brand and product names are trademarks and/or registered trademarks of their
respective holders.

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Purpose
This user’s guide aims to give you all the information you need to
operate the system properly.
Manual Structure
This user’s guide consists of two chapters as follows:
Chapter 1 System Board
This chapter describes the system board and all its major
components. It contains the system board layout, jumper
settings, cache and memory configurations, and other internal
devices.
Chapter 2 BIOS Utility
This chapter explains the system BIOS and tells how to
configure the system by setting the BIOS parameters.

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Conventions
The following conventions are used in this manual:
Text entered by user Represents text input by the user.
Screen messages Denotes actual messages that
appear onscreen.
D , H , V , etc. Represent the actual keys that you
have to press on the keyboard.
NOTE
Gives bits and pieces of additional
information related to the current
topic.
WARNING
Alerts you to any damage that
might result from doing or not doing
specific actions.
CAUTION
Suggests precautionary measures
to avoid potential hardware or
software problems.
IMPORTANT
Reminds you to take specific action
relevant to the accomplishment of
the procedure at hand.
TIP
Tells how to accomplish a
procedure with minimum steps
through little shortcuts.

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Chapter 1 System Board
1.1 System Board Layout .................................................1-2
1.2 ESD Precautions ........................................................1-4
1.3 Pre-installation Instructions.........................................1-4
1.4 Jumper Settings..........................................................1-5
1.5 Installing Memory........................................................1-8
1.5.1 Installing a SIMM.........................................1-9
1.5.2 Removing a SIMM.....................................1-10
1.5.3 Reconfiguring the System .........................1-10
1.6 Upgrading the CPU...................................................1-11
1.6.1 Unpacking the Upgrade CPU....................1-11
1.6.2 Installing the Upgrade CPU.......................1-11
1.7 Power Daughter Board.............................................1-13
1.8 Upgrading VGA Memory...........................................1-14
1.9 Upgrading Cache Memory........................................1-16
1.10 Post-installation Instructions.....................................1-17
1.11 Power-Management Feature....................................1-18
1.12 Advanced Power Management (APM) .....................1-21
1.13 Intel SL-Enhanced CPU............................................1-22
1.14 VESA DPMS.............................................................1-22
1.15 Error Messages ........................................................1-23
1.15.1 Software Error Messages..........................1-23
1.15.2 System Error Messages............................1-23
1.15.3 Correcting Error Conditions......................1-26

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Chapter 2 BIOS Utility
2.1 Entering Setup ........................................................... 2-2
2.2 Basic System Configuration....................................... 2-3
2.2.1 Date and Time............................................ 2-5
2.2.2 Diskette Drives............................................ 2-6
2.2.3 IDE Fixed Disk Drives................................. 2-6
2.2.4 System Memory.......................................... 2-9
2.2.5 Math Coprocessor ...................................... 2-9
2.2.6 Video Display............................................ 2-10
2.2.7 Communication Status.............................. 2-10
2.2.8 Enhanced IDE Features ........................... 2-11
2.2.9 Num Lock After Boot................................. 2-12
2.2.10 Memory Test............................................. 2-12
2.2.11 Auto-Configuration Mode.......................... 2-12
2.2.12 Fast Boot Mode......................................... 2-12
2.3 Advanced System Configuration.............................. 2-13
2.3.1 Shadow RAM............................................ 2-13
2.3.2 System Cache........................................... 2-14
2.3.3 System Speed........................................... 2-14
2.3.4 Memory at 15MB-16MB............................ 2-14
2.4 Power-Saving Configuration .................................... 2-15
2.4.1 Power-Management Mode ....................... 2-16
2.4.2 Monitored Activities................................... 2-18

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2.5 System Security Setup .............................................2-19
2.5.1 Disk Drive Control......................................2-19
2.5.2 Onboard Communication Ports.................2-21
2.5.3 Setup Password ........................................2-23
2.5.4 Power-On Password..................................2-24
2.6 Load Setup Default Settings.....................................2-25
2.7 Leaving Setup...........................................................2-26
2.8 Fixed Disk Types......................................................2-27

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List of Figures
1-1 System Board Layout................................................. 1-3
1-2 Jumper Locations....................................................... 1-5
1-3 Installing a SIMM........................................................ 1-9
1-4 Removing a SIMM.................................................... 1-10
1-5 Pin 1 Indicator on the Upgrade CPU and Socket..... 1-12
1-6 Installing an Upgrade CPU....................................... 1-12
1-7 Installing VGA RAM.................................................. 1-15
1-8 Installing Cache........................................................ 1-16
List of Tables
1-1 System Board Jumpers.............................................. 1-6
1-2 CPU Clock Selection.................................................. 1-6
1-3 CPU Type Selection................................................... 1-7
1-4 Cache RAM Size Selection........................................ 1-7
1-5 Memory Configurations.............................................. 1-8
1-6 Cache Size Options and Chip Locations.................. 1-16
1-7 Power-Management Modes..................................... 1-20
1-8 VESA DPMS Modes................................................. 1-22
1-9 System Error Messages........................................... 1-24
2-1 IDE Fixed Disk Configurations................................... 2-6
2-2 Drive Control Parameters......................................... 2-20
2-3 Serial Port 1 Parameters.......................................... 2-21
2-4 Serial Port 2 Parameters.......................................... 2-21
2-5 Parallel Port Control Parameters ............................. 2-22
2-6 Fixed Disk Types...................................................... 2-27