Air 486SH User manual

PREFACE
Thank you for purchasing the 486SH system board. This document
gives an aid to the configuration and installation of this system board.
The information in this document is subject to change without notice.
This document contains information protected by copyright. ll rights are
reserved. No part of this document may be used or reproduced in any
forms or by any means, or stored in a database or retrieval system,
without prior written permission.
TRADEMARKS
Intel is a registered trademark of Intel Corporation.
IBM is a registered trademark of International Business Machines
Corporation.
Microsoft is a registered trademark of Microsoft Corporation.
VES is a registered trademark of Video Electronics Standard
ssociation.
ll other trademarks used in this manual are the property of their
respective owners.
486SH System Board User's Manual Page 1

TABLE OF CONTENTS
CHAPTER 1: INTRODUCTION 4
CHAPTER 2: JUMPERS & CONNECTORS 5
SYSTEM BOARD JUMPERS 5
CPU External Cl ck Jumpers 7
CPU Type Jumpers 7
Cache Size Jumpers 8
VESA L cal Bus Jumpers 8
Clear CMOS Data Jumper 9
Display Type Jumper 9
Green PC Jumper 9
SYSTEM BOARD CONNECTORS 10
P wer Supply C nnect rs 10
External Battery C nnect r 11
Keyb ard C nnect r 11
P wer LED and Keyb ard L ck C nnect r 12
Speaker C nnect r 12
Reset C nnect r 13
Turb Switch C nnect r 13
Turb LED C nnect r 13
Green PC C nnect rs 14
CHAPTER 3: INSTALLATION 15
THE DRAM SIMMs 15
Installing DRAM SIMMs 16
INSTALLING A VL-BUS CARD 17
EQUIPMENT REQUIRED 18
CHAPTER 4: BIOS SETUP 19
ENTERING SETUP 19
STANDARD CMOS SETUP 21
ADVANCED CMOS SETUP 22
POWER MANAGEMENT SETUP 26
AUTO CONFIGURATION - BIOS DEFAULTS 26
AUTO CONFIGURATION - POWER-ON DEFAULTS 26
CHANGE PASSWORD 26
AUTO DETECT HARD DISK 27
HARD DISK UTILITY 28
WRITE TO CMOS AND EXIT 28
DO NOT WRITE TO CMOS AND EXIT 28
CHAPTER 5: KEYBOARD HOT KEYS 29
SYSTEM SPEED 29
SYSTEM SECURITY LOCKING 29
SYSTEM POWER DOWN MODE 29
PASSWORD STATE 30
APPENDIX A: AMI BIOS HARD DISK TYPE 31
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APPENDIX B: MEMORY MAPPING 32
APPENDIX C: AT I/O ADDRESS MAP 33
APPENDIX D: INTERRUPT ASSIGNMENTS 35
APPENDIX E: ENVIRONMENTAL SPECIFICATION 36
486SH System Board User's Manual Page 3

CHAPTER 1: INTRODUCTION
The 486SH system board adds to our 486 product line high integration
and cost effective solution without compromising performance and
quality. With top speed at 50MHz and integrated 64K/128K/256K Write-
Back cache, the 486SH dramatically boosts system throughput for even
the most demanding applications. The 486SH offers features and
functionality exceeding any other system board in its class, including:
CPU:
·Intel i486DX, i486DX2, i486SX, i487SX, P24T, and Overdrives.
Cache Memory:
·Supports 64K/128K/256K cache memory.
Main Memory:
·Supports 256Kx9, 1Mx9, and 4Mx9 SIMM modules.
·Up to 32 MBytes on-board memory.
S ots:
·Three 32-bit VES Local Bus slots.
·Six 16-bit IS bus slots.
·One 8-bit IS bus slot.
Green PC:
·CPU clock-slow-down and monitor shut-down features.
On-Board Battery:
·3.6V/60m on-board battery.
Page 4 486SH System Board User's Manual

486SH System Board User's Manual Page 5

CHAPTER 2: JUMPERS & CONNECTORS
When working with the
486SH, it is extreme y
important that you avoid
static e ectricity. A ways
ground yourse f by wearing
a wrist or ank e strap.
Figures 1 on the next page shows the component layout of the 486SH
system board with locations of the system board jumpers and
connectors. Note that most jumpers and connectors on the system board
are labeled with proper names with pin 1 marked as '1'. To avoid
damaging the board and to have proper operation caution should be
taken when connecting these components.
SYSTEM BOARD JUMPERS
Jumpers are used to select between various operating modes. jumper
switch consists of two, three, or four gold pins projecting from the system
board. Placing the plastic jumper cap over two pins connects those pins
and makes a particular selection. Using the cap to cover two pins in this
way is referred to as shorting those pins. If the cap is not placed on any
pins at all, this is referred to as leaving the pins open.
Note: When you open a jumper, leave the plastic jumper cap attached
to one of the pins so you don't lose it.
Page 6 486SH System Board User's Manual

FIGURE
486SH System Board User's Manual Page 7

CPU Externa C ock Jumpers
If you are installing an i486DX, or i486SX the internal CPU clock speed is
the same as the external CPU clock speed. This is different for i486DX2
CPU where the external speed is one-half of the internal speed. For
example, a 486DX2-66 has an external clock speed of 33MHz.
CPU Externa
C ock Speed
JP11 JP12 JP14 JP5
20MHz OPEN OPEN SHORT 1-2
25MHz SHORT SHORT OPEN 1-2
33MHz SHORT OPEN OPEN 1-2
40MHz OPEN SHORT OPEN 2-3
50MHz OPEN OPEN OPEN 2-3
CPU Type Jumpers
CPU Type JP15 JP16 JP18 JP19
486DX, 486DX2 1-2 1-2 SHORT SHORT
487SX, ODP486SX 1-2 2-3 SHORT SHORT
486SX 2-3 OPEN OPEN SHORT
QFP486SX 2-3 OPEN OPEN OPEN
Care should be taken when installing the CPU into the Pin Grid rray
(PG ) socket on the system board. Make certain that pin 1 of the CPU
chip is correctly aligned with pin 1 of CPU socket. The location of pin 1
on the CPU is denoted by a small notch.
Page 8 486SH System Board User's Manual

Cache Size Jumpers
The system board supports 64KB/ 128KB/ 256KB of cache memory.
Cache Size Jumper Selecti n
Cache
Size
JP1 JP2 JP3 JP20 JP21
64KB 1-2 2-3 1-2 1-2 1-2
128KB 1-2 1-2 2-3 1-2 2-3
256KB 2-3 2-3 2-3 2-3 2-3
Cache Size and SRAM L cati ns
Cache
Size
Tag RAM
U36
Data Bank 0
U2,U4,U6,U
8
Data Bank 1
U1,U3,U5,U
7
64KB 8Kx8 8Kx8 8Kx8
128KB 32Kx8 32Kx8 None
256KB 32Kx8 32Kx8 32Kx8
VESA Loca Bus Jumpers
Jumper JP4 allows any VL-Bus adapter to identify the speed of the
system board.
High Speed Write JP4
System board runs one wait state write
transfer. ll VL-Bus adapters can operate
in this mode.
2-3
(Default)
System board runs zero wait state write
transfer. Some VL-Bus adapters may not
be able to run this mode.
1-2
486SH System Board User's Manual Page 9

C ear CMOS Data Jumper
The CMOS jumper JP10 is used to clear the system configuration data
currently stored in the CMOS R M. ll system setup information (hard
disk type, date/time, etc...), stored in the CMOS, will be destroyed. This
function would be useful if you were to forget the user password for the
system.
Function JP10
Normal CMOS Operation 1-2
(Default)
Clear CMOS Data 2-3
Disp ay Type Jumper
Disp ay Type JP7
Video display is VG , EG , or
Monochrome.
OPEN
(Default)
Video display is CG . SHORT
Green PC Jumper
C ock Contro JP13
Enable Green PC clock-slow-down
control. During specified idle period, CPU
clock is slowed down to 8-MHz to
conserve power.
SHORT
(Default)
Disable Green PC clock-slow-down
control. CPU is always running at full
speed.
OPEN
Page 10 486SH System Board User's Manual