DFI 486-OCV Plus User manual

486-OCV Plus

System Board

User’s Manual

- D21840429 -

No part of this document may be copied or reproduced

in any form or by any means without the prior written

consent of DFI, Inc.

DFI, Inc. makes no warranties with respect to this

documentation and disclaims any implied warranties of

merchantability, quality, or fitness for any particular

purpose. The information in this document is subject to

change without notice. DFI, Inc. reserves the right to

make revisions to this publication and to make changes

to any and/or all parts of its content, at any time,

without obligation to notify any person or entity of such

changes. Further, DFI, Inc. assumes no responsibility

for any errors that may appear in this document.

DFI is a registered trademark, and 486-OCV Plus is a

trademark of Diamond Flower, Inc. All other product

names mentioned are trademarks or registered trade-

marks of their respective companies.

v Table of Contentsv

Introduction .................................................................................

Features and Specifications .................................................

Installation Overview .................................................................

Preparing the Area ................................................................

Handling the System Board ..................................................

Tips in Handling the System Board ...............................

Hardware Installation .............................................................

Memory Installation .........................................................

Installing the Modules ..............................................

Board Configuration ........................................................

Jumper Settings .......................................................

Jumper Settings for VL-Bus Add-On Board .....

Jumper Settings of Internal/External/CMOS

Clean, Display Type and Diagnostic/

Password Clear ..................................................

Cache Configuration ................................................

Jumper Settings for Cache Memory .................

CPU Installation and Upgrade .......................................

CPU Configuration ..................................................

Jumper Settings for CPUs .................................

Installing Upgrade CPUs ........................................

Installing the System Board ..................................................

Initial Setup Program .................................................................

AMI BIOS Setup Utilities .......................................................

Standard CMOS Setup ..................................................

Advanced CMOS Setup .................................................

Auto Configuration with BIOS Defaults .........................

Auto Configuration with Power-on Defaults ..................

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1-2

2-1

2-2

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2-7

2-8

2-11

2-14

2-16

2-18

2-19

2-22

2-26

3-1

3-2

3-3

3-5

3-7

Change Password .........................................................

Auto Detect Hard Disk ..................................................

Hard Disk Utility .............................................................

Write to CMOS and Exit ................................................

Do not write to CMOS and Exit ....................................

Troubleshooting Checklist ......................................................

Appendix A: Types of Modules ..............................................

Appendix B: System Error Report .........................................

Appendix C: Memory & I/O Maps ...........................................

Appendix D: 16-Bit ISA I/O Pin Assignments .......................

Appendix E: VL-Bus I/O Pin Assignments ...........................

Appendix F: System Overview ...............................................

Appendix G: Connector Pin Assignments ............................

Appendix H: AMI BIOS Hard Disk Table ...............................

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3-9

3-10

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486-OCV Plus

vIntroduction

The 486-OCV Plus system board is designed so that it

may be equipped with Intel's 80486DX, 80486DX2,

80486SX, and 80486 OverDriveTM Processors which can

run from speeds of 25MHz to 66MHz. It may also use

a PentiumTM OverDrive Processor running at 50MHz or

66MHz. This Pentium-based system board is twice as

fast as the 80486DX-33 and accommodates almost all of

the existing programs designed for 386 or 486-based

systems. The system board also supports a Cyrix or

AMD 486DX CPU running at 40MHz.

The 486-OCV Plus is a jumperless-upgrade board

allowing you to easily upgrade your CPU from a 486SX

to 486DX or DX2 for example, without altering any

jumpers. However, if you change your CPU speed from

25MHz to 33MHz, 40MHz or 50MHz, or change a

Cyrix CPU to an Intel or AMD CPU, you may have to

alter a few jumpers.

The 486-OCV Plus is equipped with a Zero Insertion

Force socket to make upgrading your CPU easy. It also

supports an optional Flash EPROM. Flash EPROM is a

memory chip for the storage of BIOS which can be

erased in bulk or modified using a software utility.

The 486-OCV Plus system board is also equipped with

two VESA compliant local bus slots. The VL-Bus of

the 486-OCV Plus system board operates at the same

frequency (up to 40MHz) and phase as the CPU, sup-

porting all DMA and system I/O bus mastering cycles.

Introduction u1-1

PentiumTM OverDrive Ready System Board

The 486-OCV Plus uses 256Kx36, 512Kx36, 1Mx36,

2Mx36, 4Mx36 and 8Mx36 HSIM modules with speeds

of at least 80ns. The memory can be configured to

twenty-one different sizes from 1MB to 64MB. The

system is equipped with two 32-bit VESA VL-Bus and

eight 16-bit ISA expansion slots.

Features and Specifications

•Intel 80486DX running at 33/40/50MHz,

80486DX2 running at 50/66MHz, 80486

OverDriveTM Processor, PentiumTM OverDrive

Processor running at 50/66MHz, or 80486SX

running at 25/33MHz

Cyrix or AMD 486DX running at 40MHz

•Uses AMI BIOS: 27512-20 (1)

•Uses OPTi 82C499 chip set

•Cache organization: direct map, write back and bank

interleave

•Supports 64K, 128K and 256K cache sizes

•Memory configurable from 1MB to 64MB

•Uses 256Kx36, 1Mx36 and 4Mx36 HSIMM

Uses 512Kx36, 2Mx36 and 8Mx36 (for Banks 0 and

2 only)

•Supports memory with parity check

•8MHz bus clock

•Software programmable cache and DRAM wait states

•Supports system BIOS and Video BIOS Shadow

RAM function

•Supports sixteen edge triggered interrupts

•Hidden refresh or slow refresh supported

•Optional Flash memory BIOS supported

•Supports PentiumTM OverDrive Processor Zero

Insertion Force socket

•Supports one PS/2 mouse port

•An optional diagnostic LCD port

1-2 uIntroduction

486-OCV Plus

•Supports VESA VL-Bus devices (2 VESA Master/

Slave)

ISA DMA Master access to local device

Local Master access to an ISA device

Fully compatible with VESA VL-Bus rev. 1.0

•Two 32-bit VL-Bus and eight 16-bit ISA slots

•Maximum card length

Full-length cards in all VL-Bus slots and in three

ISA slots

9.75" cards in three ISA slots

•Four layer PCB

•Baby AT size

•Operating temperature: 0oC - 40oC

•One year limited warranty

Warning:

If your 486-OCV Plus system board is using a 486DX

50 CPU, we recommend that you do not install any

VL-Bus devices. The VL-Bus connectors, compliant

with VESA VL-Bus standard rev. 1.0, limit the speed of

a VL-Bus device operating across the connector

(e.g. an add-on board) to 40MHz.

The table below, based on the VESA VL-Bus

specification, shows the recommended number of

installed VL-Bus devices at various CPU speeds. This

table is only a recommendation, not a requirement. Any

VL-Bus add-on board must correspond with the CPU

speed, whether it is buffered or unbuffered.

CPU Speed Unbuffered Buffered

<= 33MHz 2 slots/2 devices 3 slots/3 devices

40MHz 1 slot/2 devices not recommended

>= 50MHz 0 slot/2 devices not recommended

Introduction u1-3

PentiumTM OverDrive Ready System Board

vInstallation Overview

This chapter summarizes the steps in installing the

486-OCV Plus system board into your system unit. It

also includes a description of the area in which you must

work and directions for memory installation. Before

installing the system board, obtain the memory you plan

to install.

Preparing the Area

Before unpacking the system board, make sure the

location you have selected is relatively free of dust and

static. Excessive exposure to dust, static electricity,

direct sunlight, excessive humidity, extreme cold and

water can damage the operational capabilities of your

system board. Avoid soft surfaces such as beds and

carpeted floors which can hinder air circulation. These

areas also attract static electricity which can damage

some circuits on your system board.

Be sure that the power source has a properly grounded,

three-pronged socket. It is essential that the power

connection be properly grounded for correct functioning

of your system board. For further protection, we rec-

ommend that you use a surge protection socket. This

will protect the system board from damage that may

result from a power surge on the line.

Move items that generate magnetic fields away from

your system board, since magnetic fields can also dam-

age your system board. Once you have selected the

ideal location, unpack the 486-OCV Plus system board

carefully.

2-1 uInstallationOverview

486-OCV Plus

Handling the System Board

It is quite easy to inadvertently damage your system

board even before installing it to your system unit.

Static electrical discharge can damage computer compo-

nents without causing any signs of physical damage. You

must take extra care in handling the system board to

ensure that no static build-up is present.

Tips in Handling the System Board

1) To prevent electrostatic build-up, leave the board in

its anti-static bag until you are ready to install it.

2) Wear an antistatic wriststrap.

3) Do all preparation work on a static-free surface with

components facing up.

4) Hold the system board by its edges only. Be careful

not to touch any of the components, contacts or

connections, especially gold contacts on the board.

5) Avoid touching the pins or contacts on all modules

and connectors. Hold modules and connectors by

their ends.

Hardware Installation

Memory Installation

The 486-OCV Plus system board can support 1MB to

64MB of memory using HSIMMs. HSIMM is an

acronym for High Density Single In-line Memory Mod-

ule.

InstallationOverview u2-2

PentiumTM OverDrive Ready System Board

An HSIMM consists of several RAM chips soldered

onto a small circuit board. An HSIMM connects to the

system board via a 72-pin card-edge connector.

The HSIMM sockets are divided into four banks on the

system board. The 486-OCV Plus system board uses

256Kx36, 512Kx36, 1Mx36, 2Mx36, 4Mx36 and 8Mx36

HSIM modules.

Note:

The 8Mx36 HSIM module must be the standard size

module. Mechanical problem may occur if a longer

size of module is installed.

You will need 1 to 4 pieces of HSIM modules, depend-

ing on the amount of memory you intend to install.

Your system board can be configured with 1MB, 2MB,

4MB, 5MB, 6MB, 8MB, 9MB, 12MB, 13MB, 16MB,

18MB, 20MB, 24MB, 28MB, 32MB, 34MB, 36MB,

40MB, 48MB, 52MB or 64MB of onboard memory.

To install the HSIM modules, first populate Bank 0, then

Bank 1 and so on. Failure to do so will cause the

system board to work improperly.

The following table summarizes the bank locations and

modules needed for the corresponding memory sizes.

Each bank consists of 1 HSIMM socket.

2-3 uInstallationOverview

Table of contents

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