Mylex MGI486 User manual

MGI486 System Board
User's Guide
P/N: 771924
Version: D03
March 1995

Manual Notice
The information contained herein is subject to change without notice. Mylex does not
represent or warrant that this Installation and Operations Guide is correct in any or all
respects, and shall not be liable for technical or editorial omissions or errors made herein.
Except as specifically provided herein, Mylex makes no warranties, express or implied,
respecting this guide or the Mylex products referred to herein, including but not limited
to any warranty of design, merchantability, or fitness for a particular purpose, even if
Mylex has been informed of such purpose.
P/N: 771924
Version: D03
© Copyright 1995 by Mylex Corporation
P.O. Box 5035
Fremont, California 94537-5035
Copyright Notice:
This manual is copyrighted by Mylex Corporation. It may not, in whole or in part, be
copied, reproduced, photocopied, translated on paper, electronic media or computer-
readable-form or be used to make a derivative work without written permission from
Mylex Corporation, except as permitted by the United States Copyright Act of 1976, as
amended.

FCC Warning:
This device has been tested and found to comply within the limits of a class B device,
pursuant to Part 15 of FCC regulations. Operation is subject to the following two
conditions:
1) This device may not cause harmful interference.
2) This device must accept any interference received, including interference that may
cause undesired operation.
This equipment has been designed to provide reasonable protection against harmful
interference in a residential area. This equipment generates, uses, and can radiate radio
frequency energy. This device, if not installed and used in accordance with the
manufacturer's instructions, may cause harmful interference to radio communications.
There is no guarantee, however, interference will not occur in a particular installation.
Should it be determined that this equipment is causing interference to radio or television
reception, the following suggestion actions may be taken.
Reorient or relocate the receiving antennae. Increase the distance between the antennae
and the computer. Plug the computer into a different AC outlet so that the two conflicting
devices are using a different branch circuit. Contact the dealer who sold this equipment
and/or a reputable radio/television service technician for additional suggestions.
Only equipment certified to comply with Class B (computer input/output devices,
terminals, printers, etc.) should be attached to this equipment, and must have shielded
interface cables.
Finally, any changes or modifications to the equipment by the user not expressly
approved by the guarantee or manufacturer could void the users's authority to operate
such equipment. Trademarks: Mylex and MGI486 are registered trademarks of Mylex
Corporation. All other products and companies are trademarks of their respective owners
and licensees.
Manual No. 771924-D03, Mar. 1995 I

Mylex Warranty
This product is guaranteed to be free from manufacturing or material defects for a period
of 1 (one) year after the date of purchase. Should the product fail during this period,
Mylex will repair or replace (at Mylex's option) the product free of charge with the
following provisions:
1) Proof of purchase must be provided.
2) The product must have been properly installed in accordance to the documentation
provided.
3) The product must not have been modified by any party except by Mylex or an
authorized agent.
4) The product must be free of damage.
Any software, including firmware, is provided “as-is” without warranty of any kind,
expressed or implied. The purchaser bears complete risk of the performance and quality
of the software. Mylex's sole responsibility, and the purchaser's only remedy to any
defect in workmanship, shall be replacement of the defective medium (diskette or ROM).
All expressed or implied warranties for the MGI486, including, but not limited to
warranties of merchantability and fitness for a particular purpose, are restricted to the
duration of the warranty period. Under no circumstances shall Mylex be held liable, in
any way, to the purchaser for damages, including any lost profits, lost savings, or other
incidental or consequential damages arising out of the use of, or inability to use this
product. Some states do not allow warranty or liability restrictions or limitations, so the
preceding limitations may not apply to you.
II Manual No. 771924-D03, Mar. 1995

Customer Service Policy
Returned Merchandise Authorization (RMA)
All products returned to Mylex for warranty service or for other reasons must be assigned
an RMA number before shipment to Mylex. The RMA number may be obtained by
contacting Mylex's Technical Support Department. Any product received without an
RMA number will be returned to the shipper unopened.
Important Note: Only the company (or individual) that purchased the product directly
from Mylex may obtain an RMA number. If the Mylex product was purchased from a
reseller or distributor, you must contact that company for service.
The following rules/procedures apply to all RMAs:
1) The product must be returned in original packaging or other suitable materials.
2) Each returned unit will be inspected for damage or other irregularities. It a unit is
shown to be modified, the customer will be notified before any action is taken.
3) Mylex will not be responsible for non-Mylex products shipped with an RMA unit.
This includes memory, math co-processors and other internal and external
peripherals.
Products must be shipped to Mylex with freight paid. Upon completion of service, Mylex
will ship the product back UPS Ground or similar service, at no charge, unless prior
arrangements have been made.
Customer Service
End users are required to contact their suppliers.
Mylex Technical Support is available 8:00 a.m. to 5:00 p.m. Pacific Standard Time,
Monday through Friday except holidays. Contact Mylex Technical Support by voice at
[phone] or by fax at [phone]. You can also contact Technical Support
through their e-mail service at [email protected].
Manual No. 771924-D03, Mar. 1995 III

Handling Precautions
The MGI486 system board contains electronic components that are highly sensitive to
electrostatic discharge. Use extra caution when handling the MGI486 to ensure there is
adequate grounding around the work area the board is being installed. ALWAYS wear a
ground strap or ground your body by touching a grounded object such as an unpainted
metal device connected to power ground.
The MGI486 has delicate crystal oscillators that can break if subjected to sudden shock
such as being tossed on a table. Use care when moving the MGI486 from point to point.
If Troubles Are Encountered
If, during the course of installation or operation of the MGI486, the board displays
improper operation, make sure that all components are seated tightly and configured
correctly, paying particular attention to the jumper settings and the BIOS setup. Then
contact your dealer or distributor for additional information.
Dealers and Distributors may contact Mylex's Technical Support Department at (510)
796-6100 after first completing the enclosed System Problem Report.
Package Contents
MGI486 System Board, Rev. C
This Manual
Warranty Card
Any pertinent release notes available at the time of shipment
System Problem Report Form
Utility Diskette
IV Manual No. 771924-D03, Mar. 1995

Contents
1 – Introduction
About This User's Guide
The Green PC Function
Specifications
2 – System Board Setup
System Board Jumpers
CPU Type
CPU Voltage
CPU Clock (JP5, JP6, JP7)
Power Management Mode Control (JP13)
VESA Bus Wait State (JP15)
VESA Bus Clock (JP16)
Clear CMOS Data (JP11)
System Board Connectors
Power Connector (CN2)
Keyboard (CN1)
Keyboard Lock Switch and Power-On LED (J2)
Speaker (J3)
External Battery (J4)
System Reset Switch (J5)
Turbo Switch (J6)
Turbo LED (J7)
System Management Output Port (J1)
Power Management (Green) LED (D4)
Manual No. 771924-D03, Mar. 1995 V

3 – Memory Configuration
Main Memory
Cache Memory3-5
4 – BIOS Setup
Entering Setup
Standard CMOS Setup
BIOS Features Setup
Virus Protection
Cache Control
Boot Up Features
IDE HDD Block Mode
Typematic Rate Setting
Password Control
System BIOS Shadow
Chipset Features Setup
Power Management Setup
Power Management
Disabled Mode
Max. Saving
Min. Saving
User Define
Monitor Events in Full-On Mode
PM Control by APM
Video Off
IRQ 12/15 for PM
Load Setup Defaults
Password Setting
IDE HDD Auto Detection
Save and Exit Setup
Exit Without Saving
VI Manual No. 771924-D03, Mar. 1995

Chapter 1
Introduction
About This User's Guide
This User's Guide is arranged to help you set up and run the MGI486
system board.
•Chapter 1, Introduction, describes the functions and features of the
system board and specifications.
•Chapter 2, System Board Setup, includes detailed information on
how to install and configure the MGI486 system board.
•Chapter 3, Memory Configuration, describes the size and
configuration of the on-board memory and external cache memory,
and gives instructions for installing the memory devices on the
system board.
•Chapter 4, BIOS Setup, explains how to adjust the BIOS setup
using the software utility after the board setup has been completed.
•This Guide applies to the MGI486 system board, Revision C.
The Green PC Function
The Power Management Unit (PMU) controls and dramatically reduces
overall system power consumption. This is accomplished by the activity
monitors, which detect the system inactivity timer time-out, and signals
the power-saving devices to slow down the clock frequency or remove
the power sources from various peripherals.
There are four power management modes: Normal, Doze, Standby, and
Suspend.
Manual No. 771924-D03, Mar. 1995 1-1

•NORMAL mode: This mode is the normal operation of the PC
system. In this mode, the doze timer starts counting if no activity
is taking place and the programmable time-out period has expired.
•DOZE mode: In this mode, the CPU clock frequency is slowed to
one-half the normal frequency.
•STANDBY mode: This mode scales the CPU and system clock to
a lower frequency (8MHz) and turns off the video signal to
conserve power to the display monitor.
•SUSPEND mode: In this mode, the PMU stops the CPU clock,
slows down the system clock, and powers down the external cache.
The power management setup is described under BIOS Setup in
Chapter 3.
A Quick Reference diagram showing the location and configuration of all
jumpers and connectors is provided as a fold-out page at the end of
Chapter 2.
1-2 Manual No. 771924-D03, Mar. 1995
MGI486 System Board User's Guide