Micro Computer Specialists IRV-3702 User manual

User's Manual
for the
IRV-3702 Single Board Computer with AGP/VGA & Ethernet
MCSI PART NO. 89000 IRV-3702
All-In-One Single Board Computers
For Industrial/Embedded Systems Applications
MICRO COMPUTER SPECIALISTS, INC.
"The Embedded PC Specialists"
1070 Joshua Way
Vista, CA 92083
U.S.A.
Voice [phone] -Fax [phone]
email: [email protected] WebSite: http://www.mcsi1.com

Revised January 14, 2000
Revision 1.1
Changes are made periodically to the information contained herein; these changes will be incorporated
into new editions of this document.
Requests for copies of this publication or the product(s) which it describes should be made to MCSI.
While every effort has been made to insure that this document and its accompanying product(s)
are free from defects, MCSI, its distributors, representatives, and employees shall not be
responsible for any loss of profit or any other commercial damage including, but not limited to,
special, incidental, consequential, or other damages occasioned by the use of this product(s).
In the event of defect the buyer's sole recourse is to receive a refund or replacement unit at
MCSI's discretion if notified within the time period covered by the product warranty.
1999 MCSI Micro Computer Specialists, Inc. All Rights Reserved.
Celeron is a registered trademark of Intel Corporation
IBM is a registered trademark of International Business Machines Corporation.
PC/XT & PC/AT are registered trademarks of International Business Machines Corporation
MS-DOS is a registered trademark of Microsoft Corporation.
All other trademarks are the properties of their respective holders.

PREFACE
This manual provides information about the MCSI IRV-3702 All-In-One Single Board Computer. This
information is intended for users who must implement IBM PC/AT compatible computer solutions to
a wide variety of applications that cannot be satisfied using conventional desktop computers. This
manual assumes that the reader has a good understanding of MS-DOS and the standard IBM PC/AT
compatible architecture. For more information on the IBM PC compatible hardware and software
architecture, refer to any of the many books available on the subject. A few suggestions are listed
below:
•Advanced MS-DOS Programming, Microsoft Press
•Programmers Guide to the IBM PC, Microsoft Press
•Programming the 80386, Sybex
•Undocumented DOS, Addison Wesley
INVENTORY CHECKLIST
The complete IRV-3702 All-In-One Single Board Computer package consists of the following:
IRV-3702 All-In-One Single Board Computer
PROMDISK-Chip Software Utilities with ROM-DOS ver 6.22 (optional)
VGA and E2Key Software Utilities
This Manual
If any of the above is missing or appears to be damaged, inform MCSI immediately.

Table of Contents
Section 1 -Introduction ___________________________________________________________________ 1
Features............................................................................................................................................................1
Section 2 -System Description _____________________________________________________________ 2
Processor..........................................................................................................................................................2
System Memory (SDRAM)............................................................................................................................2
DMA Controller..............................................................................................................................................2
Interrupt Controller........................................................................................................................................3
Timers ..............................................................................................................................................................3
Clock/Calendar and CMOS RAM...............................................................................................................3
Keyboard Port.................................................................................................................................................3
Mouse Port ......................................................................................................................................................4
Speaker Port....................................................................................................................................................4
Reset Switch ....................................................................................................................................................4
Printer Port......................................................................................................................................................4
Serial Ports.......................................................................................................................................................4
Floppy Disk Port.............................................................................................................................................4
EIDE Hard Disk Port......................................................................................................................................5
AGP/VGA Display Port................................................................................................................................5
WatchDog Timer ............................................................................................................................................5
Optional PROMDISK-Chip Disk Emulator ................................................................................................5
High Speed PCI Expansion Bus....................................................................................................................5
Ethernet Port...................................................................................................................................................6
Universal Serial Bus Port...............................................................................................................................6
IrDA Infrared Interface Port .........................................................................................................................6
E2Key 1K-bit User EEPROM ........................................................................................................................6
Section 3 -Setup _________________________________________________________________________ 7
Section 4 -Using the PROMDISK-Chip Disk Emulator ________________________________________ 8
Using ROM-DOS and Other Disk Operating Systems..............................................................................8
PROMDISK Low Level Format....................................................................................................................8
Section 5 -Installation ____________________________________________________________________ 9
Installing the DIMMs.....................................................................................................................................9
Installing the CPU ..........................................................................................................................................9
Installing the PROMDISK-Chip ...................................................................................................................9
Completing the Installation...........................................................................................................................10
Appendix A -Specifications_______________________________________________________________ 11
Appendix B -Board Outline_______________________________________________________________ 12
Appendix C -Memory and I/O Maps ______________________________________________________ 13
Appendix D -Connectors _________________________________________________________________ 14
Appendix E -Configuration Jumpers _______________________________________________________ 18
Appendix F -BIOS Error Beep Codes _______________________________________________________ 20

1
SECTION 1 -INTRODUCTION
The MCSI IRV-3702 Celeron All-In-One Single Board Computer (SBC) contains all the basic elements
found in a high-performance IBM PC/AT compatible desktop computer system plus some unique
features that make it ideally suited for industrial applications. The most outstanding features include:
An optional 32MB PROMDISK-ChipDisk Emulator, dual PCI EIDE hard disk ports to support four
EIDE drives, a high performance multi-I/O controller, a WatchDog timer, a 1K-bit E2Key memory for
user data, and a 10/100Mbps Ethernet Port. The board uses the Intel 82443BX advanced chipset, and
the S3 Trio 3D/2X Graphics controller. The multi-I/O controller includes: dual 16C550 UARTs, a
floppy port, and a SPP/EPP/ECP multi-mode bi-directional parallel port. The optional PROMDISK-
Chip Disk Emulator comes complete with ROM-DOS version 6.22, making it ideal for embedded
diskless applications. The 1K-bit E2Key memory is a non-volatile memory useful for storing user data,
such as: critical system parameters, terminal address, etc. The WatchDog timer is ideal for controlling
critical processes where unattended operation is essential.
The IRV-3702 SBC is fully compatible with the ISA Bus and the PCI Bus (version 2.1) which means
virtually all the software written for the IBM PC/AT will run on the IRV-3702 SBC.
FEATURES
A complete list of features is listed below:
•IBM PC/AT Compatible Plug-in Computer
•Supports the Intel Celeron Processor up to 500MHz
•Includes Zero Insertion CPU Socket 370
•Intel 82443BX ChipSet
•Includes 32 bit PCI 2.1 Compatible Bus
•AMI Plug-n-Play Flash BIOS
•Passive Backplane Architecture
•S3 Trio 3D AGP/VGA Controller and 4MB Video RAM
•10/100Mbps Auto-Sensing Ethernet Port Supports IEEE 802.3u 100BASE-TX Standard
•1G-Byte High Performance SDRAM System Memory (4-168 pin DIMMs)
•Dual Floppy Disk Port Supports Two 3.5" or 5.25" Drives up to 2.88M-bytes
•PCI Extended EIDE Hard Disk Port Supports up to Four Drives
•PS2/AT Compatible Keyboard Port
•PROMDISK-Chip Socket Supports up to 32MB PROMDISK-Chip Disk Emulator
•PS2 Compatible Mouse Port
•Two High Speed 16C550 Compatible RS-232 Serial Ports
•Multimode Bi-directional Parallel Printer Port
•Dual Universal Serial Bus Ports for future expansion
•Infrared Data Access Port for future applications
•Clock/Calendar with Battery Back-up
•Low Power CMOS Design
•Full Size AT Plug-in Multilayer Board for Low EMI and High Reliability
•WatchDog Timer and Power Monitor
•On-board Mini Speaker
•Optional External Reset
•Optional Datalight ROM-DOS 6.22 Operating System

2
SECTION 2 -SYSTEM DESCRIPTION
The following sections describe the major system features of the IRV-3702 All-In-One Single Board
Computer.
PROCESSOR
The IRV-3702 SBC supports the Intel Celeron processor up to 500MHz. The Celeron microprocessor
includes MMX media enhancement technology, dynamic execution technology, a 32Kbyte
(16Kbyte/16Kbyte) non-blocking, level-one cache that provides fast access to heavily used data, and
128Kbyte L2 cache. The on-board jumper selectable clock generator and ZIF CPU socket makes
upgrading to a higher performance CPU easy. Some of the distinctive features of the Celeron
processor include: •Enhanced 64-bit data bus
•Integrated 128Kbyte L2 cache
•16Kbyte code and 16Kbyte data caches
•1G-byte Directly Addressable Memory Space
•Dynamic execution technology
•MMX multimedia technology
•On-chip Pipelined Floating Point Processor
•66 MHz multi-transaction system bus
•Integrated Memory Manager
•Branch prediction feature
SYSTEM MEMORY (SDRAM)
The IRV-3702 SBC can support up to 1G-bytes of synchronous dynamic random access memory
(SDRAM) organized as four banks of 32Mx72 including eight parity bits. The memory is configured
using four dual in-line memory module sockets, which will accept 168-pin dual in-line memory
modules (DIMMs) organized as 256MB (maximum) with a maximum access time of 10ns.
DMA CONTROLLER
The IRV-3702 SBC memory refresh and DMA functions are included in the System Controller chip that
includes the equivalence of two 82C37 DMA controllers. The two DMA controllers are cascaded to
provide four DMA channels for transfers to 8-bit peripherals (DMA1) and three channels for transfers
to 16-bit peripherals (DMA2). DMA2 Channel 0 provides the cascade interconnection for the two
DMA devices thereby maintaining IBM PC/AT compatibility. The DMA channel assignments are
listed below:
DMA Channel 0: Not Used (8-bit)
DMA Channel 1: Alternate for Multi-mode Parallel Port (8-bit)
DMA Channel 2: Floppy Disk (8-bit)
DMA Channel 3: Multi-mode Parallel Port (8-bit)
DMA Channel 5: Not Used (16-bit)
DMA Channel 6: Not Used (16-bit)
DMA Channel 7: Not Used (16-bit)
The DMA request (DRQx) and acknowledge (DACKx/) lines are available on the P1 98-pin edge
connector.

3
INTERRUPT CONTROLLER
The IRV-3702 SBC has the equivalence of two 82C59A interrupt controllers included in the System
Controller chip. The controllers accept requests from peripherals, resolve priorities on pending
interrupts and interrupts in service, interrupt the CPU, and provide the vector address of the interrupt
service routine. The two interrupt controllers are cascaded in a fashion compatible with the IBM
PC/AT. The interrupt priority and assignments are shown below in descending order of priority:
Highest IOCHCK/ Parity Check (Non-maskable)
IRQ0 System Timer (Not Available)
IRQ1 Keyboard (Not Available)
IRQ8 Real Time Clock (Not Available)
IRQ9 VGA Controller
IRQ10 Not Used
IRQ11 Not Used
IRQ12 Not Used
IRQ13 Co-processor (Not Available)
IRQ14 EIDE Disk Controller
IRQ15 Not Used
IRQ3 Serial Port 2
IRQ4 Serial Port 1
IRQ5 Alternate for Parallel Port
IRQ6 Floppy Disk Controller
Lowest IRQ7 Parallel Port
The interrupt request lines IRQx and IOCHCK/ are available on the 98-pin edge connector except as
noted above.
TIMERS
The IRV-3702 SBC has the equivalence of an 82C54 Programmable Timer included in the System
Controller chip. The 82C54 is a three channel Programmable Counter/Timer chip. The three timers
are driven by a 1.19MHz clock source derived from the on-board 14.31818MHz crystal oscillator. The
three timers are used as follows:
TIMER Channel 0: System Timer
TIMER Channel 1: Timer for DRAM refresh
TIMER Channel 2: Tone Generation for Audio
CLOCK/CALENDAR AND CMOS RAM
The IRV-3702 SBC includes a DS12B887 real time clock/calendar with 128 bytes of CMOS RAM and
integral Lithium battery which provides over 10 years of data retention when the system power is off.
The 128 byte CMOS RAM consists of 14 bytes used by the clock/calendar, and 114 bytes used by the
system BIOS.
KEYBOARD PORT
The IRV-3702 SBC contains an IBM PC/AT compatible keyboard controller for interfacing to a generic
IBM PC/AT compatible keyboard. The keyboard controller assembles the serial data from the
keyboard into bytes and interrupts the CPU via IRQ1 after each byte is ready to be read. The IRQ1
service routine reads port 60H to get the keyboard scan code and acknowledges by sending a positive

4
pulse to port 61H to clear the interrupt for the next byte. Refer to Appendix D for the keyboard
connector location and pin assignments.
MOUSE PORT
The IRV-3702 SBC contains an IBM PS2 compatible mouse port for interfacing to a generic serial
mouse. The mouse port controller assembles the serial data from the mouse into bytes and interrupts
the CPU via IRQ1 after each byte is ready to be read. The IRQ1 service routine reads port 60H to get
the scan code and acknowledges by sending a positive pulse to port 61H to clear the interrupt for the
next byte. Refer to Appendix D for the mouse port connector location and pin assignments.
SPEAKER PORT
The IRV-3702 SBC contains an on-board sub-miniature audio speaker to provide audio interface to the
user. Because of the small size of the speaker, the sound output is much reduced over that of the larger
speaker found in most desktop computers. A connector is provided to connect an external speaker if
the sound output is not sufficient. Refer to Appendix D for the speaker port connector location and pin
assignments.
RESET SWITCH
The IRV-3702 SBC includes an on-board power detector and power on reset circuit to reset the
computer after power is applied, and to hold the computer reset during low power, brown-out
conditions. In addition, there are provisions for connecting an external, normally open, push button
reset switch. Refer to Appendix D for the reset switch connector location and pin assignments.
PRINTER PORT
The IRV-3702 SBC contains a multimode parallel port that has the equivalence of an IBM PC/AT
Parallel Printer Port. The multimode parallel printer port supports the PS/2 type bi-directional parallel
port (SPP), the enhanced parallel port (EPP), and the extended capabilities port (ECP) parallel port
modes. The port can be configured as a standard IBM PC/AT compatible LPT1, LPT2, or LPT3 printer
port, or disabled completely using the CMOS Setup utility. Refer to Appendix D for the connector
location and pin assignments.
SERIAL PORTS
The IRV-3702 SBC has the equivalence of two NC16C550 UARTs. The two UARTs can be configured
as standard IBM PC/AT RS-232C compatible COM1, COM2, COM3, or COM4 serial ports or
individually disabled using the CMOS Setup utility. The data rates are independently programmable
up to 115.2K baud. Refer to Appendix D for the connector location and pin assignments.
FLOPPY DISK PORT
The IRV-3702 SBC contains an IBM PC/AT compatible dual floppy disk port with the equivalence of
an NEC PD72056B Floppy Disk Controller, an on-chip digital data separator, and an IBM PC/AT
compatible floppy disk adapter bus interface circuit. The floppy disk port can be disabled using the
CMOS Setup utility. An on-chip digital data separator provides optimum performance with the
following disk drive types:
5.25" 360K Double-Sided
3.5" 720K High Capacity
5.25" 1.2M High Capacity
3.5" 1.44M High Density
3.5" 2.88M High Density
Refer to Appendix D for the connector location and pin assignments.

5
EIDE HARD DISK PORT
The IRV-3702 SBC contains two PCI Extended Integrated Drive Electronics (EIDE) Ports that directly
interface up to four hard disk drives with embedded controllers. The EIDE Disk Port can be disabled
using the CMOS Setup utility. Refer to Appendix D for the connector location and pin assignments.
AGP/VGA DISPLAY PORT
The IRV-3702 SBC includes a S3 Trio 3D AGP/VGA display controller that interfaces directly to the
local on-board PCI bus. The display port is fully compatible with IBM AGP, VGA, EGA, CGA, and
MDA display adapters, and provides improved performance and additional functionality. The S3 Trio
3D AGP display controller combines an enhanced 128-bit graphics engine, integrated 230 MHz
RAMDAC and programmable dual-clock synthesizer, and an enhanced local peripheral bus/video
interface port for direct interface to live video and MPEG-2 peripherals. The board includes 4M-bytes
of high-speed EDO DRAM and supports video resolutions up to 1600x1200x64K colors. Drivers for
Windows 3.11, Windows NT, Windows 95/98, OS/2, and programming information can be obtained
directly from S3’s Website http://www.s3.com. Refer to Appendix D for connector location and pin
assignments.
WATCHDOG TIMER
The IRV-3702 SBC includes a WatchDog Timer circuit. The WatchDog Timer ensures that if an
application program gets "lost or bombs", the system will reset or a non-maskable interrupt will be
issued to the CPU. The WatchDog Timer is enabled by reading I/O port 443H. Once enabled, the
WatchDog Timer must be triggered by reading I/O port 443H within the time out period, otherwise
the WatchDog Timer will force a hardware reset or activate the IOCHCK/ line, generating a non-
maskable interrupt (NMI). The WatchDog Timer can be disabled by reading I/O port 43H. A jumper
is provided to select the time out period and to enable the WatchDog Timer circuit. Refer to Appendix
E for the WatchDog Timer configuration jumpers.
OPTIONAL PROMDISK-CHIP DISK EMULATOR
The IRV-3702 includes a socket designed to accept the MCSI PROMDISK-Chip. The PROMDISK-Chip
Disk Emulator is a unique Flash Memory array which emulates a bootable read/write hard disk drive.
The PROMDISK-Chip is offered in 4M, 8M, 16M, and 32M byte capacities and comes complete with
ROM-DOS version 6.22 installed. The PROMDISK-Chip occupies an 8K block of memory space above
640K, whose starting address is selected by jumper JP11. The PROMDISK-Chip uses the Datalight
Flash/FX integrated Flash File System and boot utilities. Refer to Appendix E for the jumper location.
The Flash/FX Variable Block Flash (VBF) File System and ROM-DOS allow the PROMDISK-Chip to
operate as a non-volatile Read/Write disk drive. This means that you can list directories, copy files,
and read and write to the Flash memory on PROMDISK-Chip through standard DOS interrupts and
commands.
HIGH SPEED PCI EXPANSION BUS
The IRV-3702 SBC is equipped with a high speed PCI expansion bus that allows the use of high-speed
I/O controllers such as SVGA, SCSI, Ethernet Network, and Serial Communications adapters. The PCI
expansion bus is compatible with the PICMG (PCI Industrial Computer Manufacturers Group) 2.1
standard and supports up to 4 PCI master peripheral boards.

6
ETHERNET PORT
The IRV-3702 SBC contains a Realtek RTL8139 highly integrated single-chip Fast Ethernet controller.
The RTL8139 provides 10Mbps and 100Mbps auto-sensing operation, PCI bus master capability, and
full compliance with IEEE 802.3u 100Base-TX specifications. The RTL8139 keeps network maintenance
cost low and eliminates usage barriers. It also supports full-duplex operation, making possible
200Mbps of bandwidth. Refer to Appendix D for connector location and pin assignments. For more
information on the Realtek Ethernet controller contact their web site at http://www.realtek.com.tw.
UNIVERSAL SERIAL BUS PORT
The IRV-3702 SBC contains two Universal Serial Bus Ports for the future I/O expansion bus. Refer to
Appendix D for connector location and pin assignments.
IRDA INFRARED INTERFACE PORT
The IRV-3702 SBC contains a built in IrDA infrared interface port which supports Serial Infrared (SIR)
or Amplitude Shift Keyed IR (ASKIR) interfaces. The IrDA port is addressed as COM2 and must be
setup in the BIOS’ Peripheral Setup. When the IrDA port is enabled, the standard COM2 serial port is
disabled. Refer to Appendix D for connector location and pin assignments.
E2KEY 1K-BIT USER EEPROM
The IRV-3702 SBC includes the E2Key 1K-bit electrically eraseable memory. This memory is useful for
storing user data such as password, terminal address, configuration parameters, etc. The memory is
configured as 64 words, which can be accessed a word at a time, and uses the parallel port for the
hardware interface. Software utilities are provided on the distribution disk that includes a demo
program, and two C library functions for integrating into your application program.

7
SECTION 3 -SETUP
The IRV-3702 SBC uses the latest AMI Plug-n-Play BIOS that contains an internal Setup Utility for
configuring the system. The BIOS includes a graphical user interface, and a new system configuration
utility, as well as all the features of the standard BIOS. The system configuration settings are stored in
the on-board CMOS memory which is backed up by a Lithium battery.
The Setup Utility can be invoked by first causing a cold boot (reset) or a warm boot (Cntrl Alt Del)
and pressing the Del key when instructed. This will cause the memory diagnostics to be aborted and
the Setup Utility to display the MAIN SETUP MENU. Using the →→↑↑↓↓←← cursor keys, move the
highlighted bar to the option you wish to modify and then press Enter to select it. When in the
MAIN SETUP MENU, the F2 key is used to select the colors used in the setup screens, and the F10
key is used to save the changes before exiting the Setup Utility. The Esc key may be used to exit the
Setup Utility without saving the changes. The PgUp and PgDn keys are used to scroll through the
selections for a given setting. PgUp is also used to decrease the setting and PgDn to increase the
setting. In addition, you may also enter the setup utility directly by pressing the Cntrl Alt Esc
simultaneously. A jumper at JP4 is provided to force the BIOS to use its internal default SETUP values.
This is accomplished by first removing power from the IRV-3702 and momentarily interrupting the
battery power to the system controller chip. To interrupt the battery power, install a shunt on pins 3 &
4 momentarily (the "Clear CMOS" position). After waiting a few seconds, remove the shunt jumper.
Note: This procedure must be performed with the power on.
After making the desired selections from the various setup menus, you can save your selections by
pressing the F10 key or by selecting the appropriate selection from the MAIN SETUP MENU.
Notes:
1. The user should be aware that improper selection of certain values in the CHIPSET, POWER
MANAGEMENT, and PNP/PCI selections may cause unpredictable results. If this occurs select the
FAIL SAFE SETTINGS from the MAIN SETUP MENU and then press the F10 to save and exit.

8
SECTION 4 -USING THE PROMDISK-CHIP DISK EMULATOR
The IRV-3702 SBC includes a 32-pin socket that supports the MCSI PROMDISK-Chip disk emulator
which operates as a Read/Write fixed disk drive. The paragraphs that follow describe how to use the
optional PROMDISK-Chip.
USING ROM-DOS AND OTHER DISK OPERATING SYSTEMS
The PROMDISK-Chip has been pre-configured at the factory with the latest version of the Datalight
ROM-DOS disk operating system. In addition, a current copy of the operating system is supplied on a
floppy diskette.
If the operating system is accidentally erased from the PROMDISK-Chip it may be restored using the
SYS command. The DOS format utility should not be used to restore the operating system.
To change the operating system version or type you should simply use the equivalent DOS SYS
command to transfer the operating system.
PROMDISK LOW LEVEL FORMAT
The Flash memory contained on the PROMDISK-Chip board was initialized with the Datalight
CardTrick low level format at the factory. During normal operation the Flash memory should never
require reformatting unless there is a serious hardware or software malfunction. In the event it has
been determined that the low level format is corrupted, proceed as follows:
1. At the DOS prompt, run the PROMDISK-Chip low-level format utility PDCFMT.EXE located on the
distribution diskette in the PDCHIP3 subdirectory.
2. Install a bootable floppy diskette in drive A and boot the system.
3. At the DOS prompt type SYS C: to transfer a bootable copy of DOS to PROMDISK-Chip.
4. Remove the floppy diskette from drive A: and reboot the system from PROMDISK-Chip.
CAUTION: Do Not use the DOS Fdisk utilities on the PROMDISK-Chip.

9
SECTION 5 -INSTALLATION
This section describes the procedures for installing the IRV-3702 All-In-One Single Board Computer
into your system. The following is a list of typical peripherals required to build a minimum system:
•Passive Backplane and Power Supply
•IBM PC/AT Type Keyboard
•Monitor
•Floppy or Hard Disk with MS-DOS, ROM-DOS, or PROMDISK Disk Emulator
INSTALLING THE DIMMS
When installing or removing the SDRAM DIMMs, be sure to first touch a grounded surface to
discharge any static electricity from your body. Use the following procedure to install the DIMMs:
1. Insert the first DIMM edge connector into the DIMM1 socket closest to the top of the board. Note
that the DIMMs are keyed and will only go in one way.
2. Push the DIMM into the connector carefully until it snaps into place.
3. Check to make sure the DIMM is inserted securely.
4. Insert the remaining DIMMs (if required).
To remove a DIMM, move the locking ejector tabs outward on each side of the DIMM and lift the
DIMM from the connector.
INSTALLING THE CPU
When installing or removing the CPU, be sure to first touch a grounded surface to discharge any static
electricity from your body. Use the following procedure to install the CPU:
1. Open the ZIF socket by lifting the release arm to its vertical position causing the sliding base plate
to move to the open position.
2. Align pin one (white dot or beveled edge) on the CPU chip with pin one of the ZIF (zero insertion
force) socket. Note pin 1 of the ZIF socket is located on the bottom right side of the socket. To
complete the installation gently press the CPU chip into place and return the release arm to its
locked position.
3. Double-check the insertion and orientation of the chip before applying power. Improper
installation will result in permanent damage to the chip. Refer to Appendix E for CPU speed and
configuration jumpers.
To remove the CPU chip, open the ZIF socket by lifting the release arm to its vertical position and
gently remove the chip.
INSTALLING THE PROMDISK-CHIP
When installing or removing the PROMDISK-Chip, be sure to first touch a grounded surface to
discharge any static electricity from your body. Use the following procedure to install the PROMDISK-
Chip:
1. Align pin one (square pad) on the PROMDISK-Chip with pin one of socket U31 on the CPU board.

10
2. Push the PROMDISK-Chip into the socket carefully until it is fully seated.
3. Check to make sure the PROMDISK-Chip is installed securely, and there are no bent pins.
To remove the PROMDISK-Chip, insert a small screwdriver between the PROMDISK-Chip and the
socket and gently pry around the edge until the PROMDISK-Chip is released from the socket.
COMPLETING THE INSTALLATION
To complete the installation, the following steps should be followed:
1. Set the configuration jumpers in accordance with Appendix E.
2. Install the IRV-3702 SBC into the CPU slot in a passive backplane.
3. Connect the applicable I/O cables and peripherals, i.e. floppy disk, IDE hard disk, monitor,
keyboard, power supply, etc.
4. Connect an IBM PC compatible keyboard.
5. Turn power on to the display monitor.
6. Turn power on to the backplane power supply.
7. After the BIOS sign-on message is displayed, press the Del key to enter the Setup Utility.
8. Reconfigure the IRV-3702 CMOS using the internal SETUP.
9. Boot the system.

11
APPENDIX A -SPECIFICATIONS
This appendix lists the specifications for the IRV-3702 All-In-One Single Board Computer.
CPU: Supports: Intel Celeron processors up to 500MHz, 66MHz or 100MHz clock.
Co-processor: Internal to the Celeron Chip
Memory: System Memory Expandable to 1G-bytes. Supports: 8MB, 16MB, 32MB, 64MB,
128MB, or 256MB SDRAM DIMMs using four 168-pin DIMM sockets.
128K-bytes of L2 Cache Memory internal to CPU.
BIOS: AMI Plug-n-Play BIOS Flash EPROM.
Clock/Cal: PC/AT Compatible with internal Lithium battery back-up
I/O Bus: IBM PC/AT Compatible 98-pin Edge Connector
PCI Bus: Industry Standard version 2.1 PICMG high performance I/O bus.
DMA: 7 Channels (4 8-bit & 3 16-bit) PCI Ultra DMA/33
Timers: 3 Programmable
Interrupts: 16
Reset: Controlled by on-board power detector with provisions for external reset switch at
header CN7
I/O Ports: 2 -RS-232 Serial Ports (CN12 at rear connector, and CN11 header)
1 -Parallel Printer Port (at connector CN4)
1 -PS2 Keyboard Port (at header CN8 and at rear PS2 type connector CN18)
1 -On-board Speaker with Speaker Port (CN7)
1 -Dual 3.5"/5.25" Floppy Disk Port (CN2)
2 -IDE Hard Disk Port (Primary at CN1 & Secondary at CN3)
1 -WatchDog Timer
1 -PS2 Mouse Port (CN18 and header CN17)
1 -IDE LED Port (CN7)
1 -Keylock & Power LED (CN7)
2 -Universal Serial Bus Ports (at header CN9)
1 -IrDA Infrared Port (CN6)
1 -Ethernet Port, RJ-45 connector (CN10), LAN LED (CN5)
3 –Cooling Fan Power/Status Ports (CN13-CN15)
PCI Video Port: 1 -PCI VGA Video Port (at rear connector J1)
Chipset: S3 Trio 3D Video Controller
VRAM: 4MB SDRAM
Resolution: 1600 x 1200 64K color
1280 x 1024, 64K color
1024 x 768 16M color
Speed: 300-650MHz jumper selectable.
Battery: Clock/Calendar with Internal Lithium battery (ten year life typical)
Benchmark: LANDMARK v2.0 = 2337MHz for 400MHz CPU
Size: Full Size AT board 13.3"L X 4.8"H
Weight: 12 Oz.
Power: +5VDC @ 5.5A, +12VDC @ 0.160A, -12VDC @ 0.060A

12
APPENDIX B -BOARD OUTLINE
1
CN1 CN2
CN4
CN11
JP15
JP12
.Denotes pin 1
CN10
CN18
J1
CN3
CN7
CN12
CN8
CN17
JP7
JP3
CN13
JP14
BIOS
PROMDISK-Chip
U31
DIMM1
DIMM2
DIMM3
DIMM4
CN15 CN14
CN9
JP4
JP8
JP5
JP11
CN6
CN5

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APPENDIX C -MEMORY AND I/O MAPS
The following is the memory map for the IRV-3702 SBC. The addresses are fully PC/AT compatible,
unless otherwise specified.
IRV-3702 SBC Memory Map
Address Used For Size
00000H -003FFH Interrupt Vectors 1.0K
00400H -005FFH BIOS Values 0.5K
00600H -9FFFFH User RAM (DOS) 638.5K
A0000H -AFFFFH Reserved for VGA 64.0K
B0000H -B7FFFH Video RAM (MDA)* 32.0K
B8000H -BFFFFH Video RAM (CGA)* 32.0K
C0000H -C3FFFH Reserved 16.0K
C4000H -C7FFFH EMS Window 16.0K
C8000H -DFFFFH ROM Scan Devices* 96.0K
E0000H -FFFFFH System BIOS 128.0K
100000H -3FFFFFFFH User Memory 1GB
*External to the IRV-3702
The following is the I/O map for the IRV-3702 SBC. I/O addresses are fully PC/AT compatible,
unless otherwise specified.
IRV-3702 SBC I/O Map
Address Function
000H -01FH DMA Controller #1
020H -021H Interrupt Controller #1
022H -023H Configuration Address Register
040H -05FH System Timers & WatchDog Timer
060H -063H Keyboard, Status, & System Control
070H -07FH Clock/Calendar & CMOS Ram Access
080H -083H DMA Page Register
0A0H -0BFH Interrupt Controller #2
0C0H -0DFH DMA Controller #2
0F0H Clear Math Co-processor Busy
0F1H Reset Math Co-processor
1F0H -1F8H IDE Hard Disk
278H -27FH Parallel Printer Port LPT2
2E8H -2EFH Serial Port COM4
2F8H -2FFH Serial Port COM2
378H -37FH Parallel Printer Port LPT1
3BCH -3BFH Parallel Printer Port LPT3
3E8H -3EFH Serial Port COM3
3F0H -3F7H Floppy Disk Controller
3F8H -3FFH Serial Port COM1
043H Disable WatchDog Timer
443H Enable WatchDog Timer

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APPENDIX D -CONNECTORS
CN8 Keyboard Header/Connector
Pin Signal
1KBCLK
2KBDATA
3N/C
4GND
5+5VDC
CN18 Keyboard/Mouse Connector (PS2 type)
Pin Signal
1 KBDATA
2 MDATA
3 GND
4 +5VDC
5 KBCLOCK
6 MCLK
CN7 Keylock Header/Connector
Pin Signal Name Description
2LED POWER (+) Connect to anode of power LED
4N/C (Key) N/C (Key)
6GND Connect to cathode of power LED
8KB LOCK/ Connect to ground to inhibit keyboard
10 GND Ground
CN2 Floppy Disk Port Connector
Pin Signal Name
2 RPMLC
4 Not Used
6 Not Used
8 INDEX/
10 MOTOR0/
12 DRIVE SELECT1/
14 DRIVE SELECT0/
16 MOTOR1/
18 DIRECTION
20 STEP/
22 WRITE DATA/
24 WRITE GATE/
26 TRACK0/
28 WRITE PROTECT/
30 READ DATA/
32 HEAD SELECT/
34 DISK CHANGE/
All odd numbered pins are GND