VersaLogic VL-586-1 Reference Manual

Reference

Reference

ReferenceReference
Manual

Manual

ManualManual

VL-586-1

5x86 Industrial CPU Card
for the STD 32 Bus

TM

VL-586-1

5x86 Industrial CPU Card
for the STD 32 Bus

TM

M586-1

VL-586-1

5x86 Industrial Computer

for the STD 32 Bus

REFERENCE MANUAL

Doc. Rev. 10/01/2003

(for VL-586-1 Rev. 3)

V

ERSALOGIC CORPORATION

WWW.VERSALOGIC.COM

Notice:

Although every effort has been made to ensure this document is error-free, VersaLogic makes no
representations or warranties with respect to this product and specifically disclaims any implied
warranties of merchantability or fitness for any particular purpose.

VersaLogic reserves the right to revise this product and associated documentation at any time
without obligation to notify anyone of such changes.

3888 Stewart Road
Eugene, OR 97402

[phone]

Fax [phone]

Contents Copyright ©2000

All Rights Reserved

Table of Contents

Other References ...............................................................................................................vi

1. Overview ....................................................................................................................1

Using This Manual ............................................................................................................. 1

Introduction ........................................................................................................................ 1

PC/AT Compatibility............................................................................................. 1

STD/STD32 Bus Compatibility............................................................................. 2

PC/104-Plus Compatibility ................................................................................... 2

On-Board Memory ................................................................................................ 2

Hard Disk and Floppy Disk Interface.................................................................... 2

Serial Ports............................................................................................................. 2

Parallel Port ...........................................................................................................3

Counter/Timers...................................................................................................... 3

Real Time Clock with CMOS RAM ..................................................................... 3

Interrupt Controllers .............................................................................................. 3

DMA Controllers................................................................................................... 3

Watchdog Timer .................................................................................................... 3

Technical Specifications..................................................................................................... 4

Technical Support...............................................................................................................5

Repair Service........................................................................................................ 5

2. DOS Based Quick Start.............................................................................................7

Introduction ........................................................................................................................ 7

Installation .......................................................................................................................... 8

Jumper Locations................................................................................................................9

Card Installation ...............................................................................................................10

Monitor Installation .......................................................................................................... 11

Cable Installation..............................................................................................................12

CMOS RAM Setup........................................................................................................... 12

CMOS Setup Options ....................................................................................................... 13

Main CMOS Setup Menu .................................................................................... 13

Basic CMOS Configuration................................................................................. 13

Advanced Configuration...................................................................................... 13

Shadow Configuration......................................................................................... 13

Reset CMOS to Last Known Values ................................................................... 13

Reset CMOS to Factory Defaults ........................................................................ 14

Write to CMOS and Exit ..................................................................................... 14

Exit Without Changing CMOS............................................................................ 14

Clearing the CMOS RAM ................................................................................................ 15

3. Configuration...........................................................................................................17

Hardware Jumper Summary ............................................................................................. 17

Jumper Block Locations ...................................................................................... 18

iii

Table of Contents

Memory Configuration ..................................................................................................... 22

ROM Configuration............................................................................................. 22

DRAM Configuration.......................................................................................... 22

CMOS RAM Configuration ................................................................................ 23

Battery Backed SRAM Configuration................................................................. 23

Memory Map ....................................................................................................... 24

I/O Configuration ............................................................................................................. 25

Using 8-Bit STD Bus I/O Cards .......................................................................... 25

Using 10-Bit STD Bus I/O Cards ........................................................................ 25

Using 16-Bit STD Bus I/O Cards ........................................................................ 26

Using PC/104 Modules........................................................................................ 26

I/O Map................................................................................................................ 27

COM2 Configuration........................................................................................................ 28

RS-232 Operation ................................................................................................ 28

RS-422 Operation ................................................................................................ 28

RS-485 Operation ................................................................................................ 28

Multiprocessor Configuration .......................................................................................... 30

Multiprocessor Jumper Configuration................................................................. 30

Resistor Pack Configuration................................................................................ 31

Multiprocessor CPU Reset ..................................................................................31

Interrupt Configuration..................................................................................................... 32

Interrupt Configuration Jumpers .........................................................................33

STD Bus Interrupt Signals................................................................................... 34

CPU Interrupt Request Inputs.............................................................................. 35

Interprocessor Communications Interrupt Configuration ................................... 37

Non-maskable Interrupt Configuration ...............................................................37

4. Installation ...............................................................................................................39

Introduction ...................................................................................................................... 39

Card Insertion and Extraction........................................................................................... 40

Card Installation .................................................................................................. 40

Card Placement.................................................................................................... 40

STD 80 Bus Installation Guidelines .................................................................... 40

STD 32 Bus Installation Guidelines .................................................................... 40

External Connections........................................................................................................ 41

Connector Functions............................................................................................ 41

Connector Locations............................................................................................ 41

High Density 100-Pin Connector ........................................................................ 42

JA, JE – Serial Port Connectors........................................................................... 43

JB – LPT1 Parallel Port Connector .....................................................................44

JC – Counter/Timer ............................................................................................. 45

JD – Keyboard Connector ................................................................................... 46

JF – Hard Disk Drive Connector ......................................................................... 47

J2 – Interrupt Connector...................................................................................... 48

J3 – Floppy Disk Drive Connector ...................................................................... 49

L1 – Speaker Connector ...................................................................................... 50

iv

Table of Contents

5. Register Descriptions .............................................................................................51

Introduction ...................................................................................................................... 51

Register Summary ............................................................................................................ 51

Direct Memory Access — Channel 1.................................................................. 52

Direct Memory Access — Channel 2.................................................................. 53

Direct Memory Access — Page Registers .......................................................... 53

COM1 Serial Port ................................................................................................ 54

COM2 Serial Port ................................................................................................ 54

LPT1 Parallel Port ............................................................................................... 55

Floppy Disk Drive Controller.............................................................................. 56

IDE Hard Disk Drive Controller ......................................................................... 56

Interrupt Controller — Master............................................................................. 57

Interrupt Controller — Slave............................................................................... 57

Counter/Timers.................................................................................................... 58

Miscellaneous ...................................................................................................... 58

Special Control Register...................................................................................... 59

Watchdog Timer Hold-Off Register.................................................................... 60

I/O and Memory Map Control Register .............................................................. 61

Map and Paging Control Register ....................................................................... 62

Appendix A — Schematic ...........................................................................................63

Index.............................................................................................................................72

v

Other References

Acer Laboratories Inc., [phone], http://www.ali.com.tw

M1489 / M1487 486 PCI Chipset Data Book

Chips and Technologies, Inc., [phone], http://www.chips.com

82C735 Super I/O Chip Data Book

STD 32 Manufacturers Group, [phone], http://www.std32.com

STD 32 Bus Specification and Designer’s Guide

Advanced Micro Devices [phone], http://www.amd.com

AM486DX5-133V17BHC Data Book

Additional Resources,

http://www.annatechnology.com

http://www.annatech/bookBrowseBySubjectF.asp

Other References

vi

Using This Manual

Each chapter in this manual corresponds to a step in the installation process:

Chapter 1 – Overview

Lists basic information about the CPU card, specifications, and system requirements. Use
this chapter to familiarize yourself with the card and it’s capabilities.

Chapter 2 – DOS Based Quick Start

Describes how to quickly get your DOS based system set up and running using a VL-586-1
CPU card.

Chapter 3 – Configuration

Describes how to jumper the CPU card.

Chapter 4 – Installation

Describes how to install the VL-586-1. It also provides details on the external connections.

Chapter 5 – Register Descriptions

Overview

1

Provides details about the user-programmable registers on the CPU card.

Appendix A – Schematics

Circuit diagrams.

Introduction

The VL-586-1 CPU card is fully PC hardware compatible, and features a 32-bit, 133 MHz,
Am5x86 microprocessor, up to 32MB RAM, 512K or 2.5MB Flash, two COM ports, one LPT
port, six counter/timers, and real time clock. The card supports all operating systems designed to
execute on PC hardware (DOS, Windows 95, QNX, etc.) and can be expanded using STD/STD
32 Bus I/O cards or by plugging PC/104 or PC/104-Plus expansion modules directly onto the
VL-586-1 circuit card.

PC/AT C

Standard I/O and peripheral interfaces, including BIOS, Embedded DOS, and a bootable Flash
Disk System bring a diskless embedded PC to the STD Bus form factor.

OMPATIBILITY

VL-586-1 Reference Manual Overview – 1

Introduction

STD/STD32 B

US COMPATIBILITY

The VL-586-1 CPU card complies with certain subsets of the STD 32 Bus specification that
allow it to communicate with STD 80 compatible 8-bit and STD 32 compatible 16-bit I/O and
memory cards. In addition, the card fully complies with the STD 80 Bus specification using a
bus speed of 8.33 MHz. The CPU card is compatible with all I/O and memory cards that adhere
to STD 80 specifications.

PC/104-P

LUS COMPATIBILITY

The VL-586-1’s PC/104-Plus expansion site allows PC/104 and PC/104-Plus modules to be
stacked directly on the board. This permits the use of high speed video modules and "local" I/O
expansion in systems using multiple processor cards. Use of on-board modules requires an
empty card slot space next to the VL-586-1 board. Both standard PC/104 and PC/104-Plus (PCI
32-bit, 33 MHz) based modules are supported.

N-BOARD MEMORY

O

DRAM

The on-board DRAM socket (U11) accepts one standard 72-pin SO DIMM module. A

variety of sizes may be used (16M, 32M or 64M.) Fast Page Mode and EDO type modules are
supported, provided they are 70ns or faster. Both 5V or 3.3V modules can be used (jumper
selectable.)

BBSRAM

The (-p) version of the VL-586-1 includes 512K of on-board Battery-Backed Static
RAM for non-volatile storage of information. This RAM is accessible through a 64K page frame
at E0000h in the main memory map.

CMOS RAM

FLASH

or 32 pin J-lead ceramic part(s). A Flash Disk System and Embedded DOS are included

PLCC

Standard setup values are stored in a small battery-backed CMOS RAM chip.

The VL-586-1 on-board ROM socket (U3) accepts 128Kx8 or 512Kx8, 32 pin plastic

which allow the card to boot to the A: prompt without user configuration.

ARD DISK AND FLOPPY DISK INTERFACE

H

A 40-pin IDE hard disk drive interface supports modes 1 through 4 via a PCI based controller. A
34-pin floppy disk drive interface is also included on the VL-586-1 card for connection to
industry standard 3½" floppy drives. Each interface supports two drives, and will work with
externally mounted or in-rack devices.

ERIAL PORTS

S

The two on-board serial ports are hardware and software compatible with 16550 type UARTs
with 16 byte FIFOs. Baud rates are programmable from 50 baud to 115K baud. COM1 is a
standard RS-232 interface, COM2 can be jumpered for RS-232, RS-422, or RS-485 operation.

2 – Overview VL-586-1 Reference Manual

Introduction

ARALLEL PORT

P

The parallel port can be used as a standard bi-directional/ECP/EPP compatible LPT port or as 17
general purpose TTL I/O signals. When operating in standard bi-directional mode, each output
line has a 24 ma current sink rating. Eight of the signals are programmable as a group for input
or output, three are dedicated output, and five are dedicated inputs. A strobe signal, which
produces a 50 µs pulse under program control, is also available as an output.

OUNTER/TIMERS

C

The VL-586-1 card includes six 8254 type 16-bit counter/timers. Three channels are used by the
operating system; one channel is reserved for dynamic

refresh, one channel generates an

RAM

18.2 ms DOS interrupt, and another channel is used to drive the speaker. The remaining three
channels are unallocated, and can be clocked with on-board crystal oscillators or from external
inputs.

EAL TIME CLOCK WITH

R

CMOS RAM

A battery-backed 146818 compatible real time clock (RTC) provides accurate date and time
functions. This PC/AT compatible RTC also contains 128 bytes of battery-backed CMOS RAM
with 114 bytes available as a system resource to store standard setup parameters. Normally the
BIOS requires 94 bytes, leaving 20 bytes for general purpose use.

NTERRUPT CONTROLLERS

I

Two PC AT compatible 8259 type programmable interrupt controllers (PICs) are provided for
full DOS functionality. Interrupt sources and destinations can be configured with jumper blocks.
Interrupt lines connect to on-card sources, STD/STD 32, PC/104, and PCI Bus sources, and to a
user connector.

DMA C

ONTROLLERS

The VL-586-1 has two DMA controllers which provide a total of eight DMA channels (four 8-bit
channels and four 16-bit channels.) DMA control signals for seven channels are available on the
PC/104 Bus. The remaining 16-bit channel is accessible only by software. DMA control signals
are not available on the STD Bus, PCI Bus, or via front plane connector.

ATCHDOG TIMER

W

A Dallas 1232 watchdog timer circuit provides a degree of protection against hardware and
software failures. When the watchdog timer is enabled, it must be periodically updated by
software at least every 250 ms minimum. A system failure which prevents updating will reset the
CPU. This same circuit monitors the +5V power, and handles a variety of CPU reset functions.

VL-586-1 Reference Manual Overview – 3

Technical Specifications

Technical Specifications

Specifications are typical at 25°C with 5.0V supply unless otherwise noted.

Size:

Meets all STD 80 and STD 32 Bus mechanical specifications

Storage Temperature:

-40 °C to 85 °C

Free Air Operating Temperature:

0 °C to 65 °C

Power Requirements:

5V ±5% @ 1570 ma
(±12V may be required by add-on PC/104 I/O modules)

System Reset:

Vcc sensing, resets below 4.7V

Watchdog reset (jumper option)

LPT1/Parallel Interface:

Data Lines:

Output low voltage: 0.5V @ 24 ma
Output high voltage: 2.4V @ -12 ma

Control Lines:

Output low voltage: 0.5V @ 24 ma
Output high voltage: 2.4V @ -150 µA

COM1 & COM2 Serial Interfaces:

COM2 configurable as RS-232/422/485

Floppy Disk Drive Interface:

Supports two drives.

Hard Disk Drive Interface:

Supports two EIDE drives.

Memory Sockets:

DRAM:

16, 32 or 64 MB system dynamic RAM in one 72-pin SO DIMM gold plated socket

SRAM: (battery backed on board)

128K / 512K byte battery backed static RAM in a JEDEC compatible 32-pin SOP site

Flash:

128K to 2.5 MB (64K paged)
One 32-pin PLCC socket and one 48-pin TSOP site

Memory Speed: (on-board):

RAM: 70 ns
Flash: 200 ns or faster

Bus Compatibility:

STD 80: Full compliance, 8.33 MHz bus speed
STD 32: Permanent Master, SA16, SA8 I, MB, MX
STD 32: Temporary Master, SA16, SA8 I, MB, {MX}
PC/104: Full compliance
PC/104-Plus: Full compliance

(with 8 MB DRAM, 512 K Flash, 512 K SRAM, Keyboard)

Specifications are subject to change without notice.

4 – Overview VL-586-1 Reference Manual

Technical Support

If you have problems that this manual can’t help you solve, contact VersaLogic for technical
support at [phone] or [phone]. You can also reach VersaLogic by e-mail at
[e-mail].

EPAIR SERVICE

R

If your product requires service, you must obtain a Returned Material Authorization (RMA)
number by calling [phone].

Please provide the following information:

• Your name, the name of your company, and your phone number

• The name of a technician or engineer who we can contact if we have questions

• Quantity of items being returned

• The model and serial number of each item (the serial number is a 5 digit bar code)

Technical Support

• A description of the problem

• Steps you have taken to resolve or repeat the problem

• The return shipping address

Warranty Repair All charges are covered, including UPS 3rd Day Select shipping

charges for return back to your facility.

Non-warranty Repair All non-warranty repairs are subject to diagnosis and labor charges,

parts charges, and return shipping fees. We will need to know what
shipping method you prefer for return back to your facility, and we
will need to secure a purchase order number for invoicing the repair.

Note! Please mark the RMA number clearly on the outside of the box before

returning.

Send To VersaLogic Corporation

3888 Stewart Rd
Eugene, OR 97402

VL-586-1 Reference Manual Overview – 5

This chapter describes how to quickly get your DOS-based system set up and running using the
VL-586-1 CPU card

Introduction

A minimum DOS based run time system requires the CPU card, a BIOS, and a boot device
containing an operating system and an application program. In many cases a video card,
keyboard, and monitor are added to this list, however, the VL-586-1 does not demand their
presence in order to boot.

The VL-586-1 includes a Flash Disk System and an installed bootable copy of Embedded DOS.
If you require a DR-DOS disk call 1-541-485-8575 and we will send one free of charge. The
CMOS RAM information is shipped in its factory default condition, which allows immediate
booting to the command prompt. If the CMOS Setup parameters need to be changed, the most
convenient method of setting up this information is by using a keyboard and monitor. This
requires the addition of a video card.

Typical components of a VL-586-1 DOS based system include:

• VL-586-1 CPU Card

DOS Based Quick Start

2

• STD or STD 32 Card Cage

• Standard PC/AT keyboard

• PC/104 Video Module

• Video Monitor

• Keyboard

• Power Supply

VL-586-1 Reference Manual DOS Based Quick Start – 7

Installation

Installation

Caution Electrostatic discharge (ESD) can damage cards, disk drives, and other

components. Do the installation procedures described in this chapter only at an
ESD workstation. If such a station is not available, you can provide some ESD
protection by wearing an antistatic wrist strap and attaching it to a metal part on
the card cage.

Cards can be extremely sensitive to ESD and always require careful handling.
After removing the card from its protective wrapper or from the card cage, place
the card on a grounded, static-free surface, component side up. Use an anti-static
foam pad if available, but not the card wrapper. Do not slide the card over any
surface.

The card should also protected during shipment or storage with anti-static foam or
bubble wrap. To prevent damage to the lithium battery, do not use black
conductive foam or metal foil.

Warning! The lithium battery may explode if mistreated. Do not recharge, disassemble, or

dispose of in fire. Dispose of used batteries promptly.

8 – DOS Based Quick Start VL-586-1 Reference Manual

Jumper Locations

Note Jumpers and resistor packs shown in as-shipped configuration.

Jumper Locations

VL-586-1 Reference Manual DOS Based Quick Start – 9

Figure 1. VL-586-1 CPU Card Layout

Card Installation

Card Installation

A typical development system consists of a six-slot V32-06T Card Cage, populated with:

• VL-586-1 CPU Card (with attached EPM-SVGA PC/104-Plus Video Module)

• IDE Hard Disk Drive

• Floppy Disk Drive

A VGA compatible monitor and a PC/AT compatible keyboard are also required to complete the
set of hardware necessary for development purposes.

Warning! To prevent damage, cards should be inserted in and removed from the card cage

only when the system power is off.

Caution To avoid damaging cards, they must be oriented correctly (usually with the card

ejector toward the top of the card cage.) Refer to the card cage documentation for
the correct way to insert STD/STD 32 Bus cards.

10 – DOS Based Quick Start VL-586-1 Reference Manual

Monitor Installation

A VGA monitor should be connected to the EPM-SVGA module as shown .

Monitor Installation

Figure 2. Jumpers/Connections for an EPM-SVGA Using a VGA Monitor

VL-586-1 Reference Manual DOS Based Quick Start – 11

Cable Installation

Cable Installation

To bring the header connectors on the VL-586-1 CPU card out to industry standard PC pinouts,
the VersaLogic cable VL-CBL-100A is used.

CMOS RAM Setup

The VL-586-1 CPU card uses battery-backed, non-volatile CMOS RAM provided by the real
time clock chip to store system configuration settings. You can change these system settings with
the Setup program (accessed manually during system boot.) The configuration information is
read by the CPU upon system reset.

The Setup program is permanently stored in ROM, and can be run with or without an operating
system present. To run Setup, reset the CPU card and press the DEL key when prompted.

Select “BASIC CMOS CONFIGURATION” to display a summary of the information stored in
the CMOS RAM. To change the values shown, use the cursor arrows to move the highlight bar
to the desired entry field and press the – or + keys to change the values.

When you are finished, exit to the main Setup menu and select “WRITE TO CMOS AND
EXIT” to save the changes and exit the Setup program. The CPU will then boot from the on­board Flash Disk System (drive A:).

12 – DOS Based Quick Start VL-586-1 Reference Manual

CMOS Setup Options

CMOS Setup Options

M

ASIC

B

AIN

CMOS S

CMOS C

ETUP MENU

SYSTEM BIOS SETUP - UTILITY VERSION 2.001.xxx

(C) 1994-1996 VERSALOGIC, CORP. ALL RIGHTS RESERVED

Basic CMOS Configuration

Advanced Configuration

Shadow Configuration

Format Integrated Flash Disk

Reset CMOS to last known values

Reset CMOS to factory defaults

Write to CMOS and Exit

Exit without changing CMOS

<ESC> TO CONTINUE (NO SAVE)

ONFIGURATION

This option goes to another menu which allows you to change the following:

• Date, Time

• Drive assignments and types

• Boot sequence

• Keyboard Parameters

• Memory Tests

A

DVANCED CONFIGURATION

This option goes to another menu which allows you to change the following:

• Bus Timing

• Memory and I/O Mapping

• Cache Control

S

HADOW CONFIGURATION

This option allows you to change ROM shadowing parameters.

ESET

R

CMOS

TO LAST KNOWN VALUES

This option acts like an undo function. It reverts all changes made in the CMOS Setup Screens to
the values they had when Setup was first entered.

VL-586-1 Reference Manual DOS Based Quick Start – 13

CMOS Setup Options

ESET

R

CMOS

TO FACTORY DEFAULTS

This option overwrites all information contained in the CMOS RAM with predefined parameters
stored in the BIOS ROM, and reboots the CPU card.

The following parameters are loaded into CMOS RAM when this option is selected:

Basic CMOS Configuration

+---------------------------------------+--------------------------------------+
| Base Memory : 640 | Date (month day year) : Jan 01, 1997 |
| Extended Memory : 15360 | Time (hours:min:sec) : 00 : 00 : 00 |
| Drive A: type : Flash Disk +--------------------------------------+
| Drive B: type : Not installed Cyln Heads WPcom LZone Sect Size |
| Hard disk C: type : Not installed |
| Hard disk D: type : Not installed |
| --------------------------------------+--------------------------------------+
| 1st Boot Device : Mfg Mode | Seek Floppy at Boot : Enabled |
| 2nd Boot Device : Drive A: | Seek Hard Drive At Boot : Enabled |
| QNX FFS Extension : Disabled | |
| | Display "Hit <Del>..." : Enabled |
| | System Configuration Box : Enabled |
| Typematic Keys : Enabled | Wait for F1 on Error : Enabled |
| Typematic Delay : 250 ms | NumLock State at Boot : Disabled |
| Typematic Rate : 30 cps | |
| Memory Test Tick : Enabled | On-board IDE controllers : Enabled |
| Test Above 1MB : Enabled | PC/104 Video Shadowing : Enabled |
+---------------------------------------+--------------------------------------+

Advanced Configuration

+----------------------------------------+---------------------------------------+
| AT Bus Clock : CPUCLK/4 | Fast PC/104 Cycle : Enabled |
| DMA Clock : AT Clk/2 | Fast PCI Memory Cycle : Enabled |
| 16 bit PC/104 Wait States : None | CPU->PCI Write Buffer : Enabled |
| PC/104 I/O Recovery : Enabled | CPU->PCI Write Buff. Merge : Enabled |
| PC/104 I/O Recovery Time : 24*ATClk | CPU->PCI Write Buff. Burst : Enabled |
| DRAM Read Timing : Normal | CPU->PCI Fast Back-to-Back : Enabled |
| DRAM Write Timing : Normal | PCI->CPU Read Buffer : Enabled |
| 32-Bit PCI BIOS Extension : Enabled | PCI->CPU Write Buffer : Enabled |
| Reserved : Not Used | PCI->CPU Write Buff. Burst : Enabled |
| Reserved : Not Used | Internal Cache : Enabled |
| Slot 1 Using INT# : INT A | PCI INT A -> IRQ# : IRQ 15 |
| Slot 2 Using INT# : INT B | PCI INT B -> IRQ# : IRQ 12 |
| Slot 3 Using INT# : INT C | PCI INT C -> IRQ# : IRQ 11 |
| Slot 4 Using INT# : INT D | PCI INT D -> IRQ# : IRQ 10 |
| Route COM3:3E8h COM4:2E8h : PC/104 | Route I/O 0100h-027Fh : PC/104 |
| Route Memory D0000-D7FFFh : PC/104 | Route Memory C8000-CFFFFh : PC/104 |
| | |
+----------------------------------------+---------------------------------------+

RITE TO

W

CMOS

AND EXIT

This option updates the CMOS RAM with the information in the CMOS Setup Screens. After
writing, the CMOS checksum is updated and the CPU card is rebooted.

XIT WITHOUT CHANGING

E

CMOS

This option acts like a cancel function. Use it to exit Setup without changing CMOS RAM.

14 – DOS Based Quick Start VL-586-1 Reference Manual

Clearing the CMOS RAM

Jumper V6[1-2] allows you clear the CMOS RAM contents if you remove the battery, install
incorrect setup information, or otherwise corrupt CMOS RAM. To ensure integrity of the CMOS
RAM, the Setup program calculates and stores an internal checksum of the setup data. Upon
reset, the CPU detects if the CMOS RAM is corrupted by analyzing the checksum. If you wish to
completely clear the contents of the CMOS RAM, briefly move jumper V6 to position [1-2] (top
position) then back to the position [2-3] (lower position) and reboot the system. This process will
load the factory default setup parameters into the CMOS RAM.

Warning! Do not apply power to the CPU card with jumper V6[1-2] installed, doing so may

damage the chipset and void the warranty. Jumper V6[1-2] is only briefly used to
clear the CMOS RAM.

Clearing the CMOS RAM

Figure 3. CMOS RAM Jumper

VL-586-1 Reference Manual DOS Based Quick Start – 15