National Instruments AT-GPIB/TNT User manual

© Copyright 1994 National Instruments Corporation.
All Rights Reserved.
Getting Started with Your
AT-GPIB/TNT and the NI-488.2M™
Software for LynxOS
October 1994 Edition
Part Number 320808A-01

National Instruments Corporate Headquarters
6504 Bridge Point Parkway
Austin, TX 78730-5039
[phone]
Technical support fax: [phone]
[phone]
Branch Offices:
Australia [phone], Austria [phone], Belgium 02/757.00.20,
Canada (Ontario) [phone], Canada (Québec) [phone],
Denmark 45 76 26 00, Finland (90) 527 2321, France (1) 48 14 24 24,
Germany 089/741 31 30, Italy 02/48301892, Japan [phone],
Mexico 95 800 010 0793, Netherlands 03480-33466, Norway 32-84 84 00,
Singapore 2265886, Spain (91) 640 0085, Sweden 08-730 49 70,
Switzerland 056/20 51 51, Taiwan 02 377 1200, U.K. 0635 523545

Limited Warranty
The AT-GPIB/TNT is warranted against defects in materials and workmanship for a
period of two years from the date of shipment, as evidenced by receipts or other
documentation. National Instruments will, at its option, repair or replace equipment that
proves to be defective during the warranty period. This warranty includes parts and
labor.
The media on which you receive National Instruments software are warranted not to fail
to execute programming instructions, due to defects in materials and workmanship, for a
period of 90 days from date of shipment, as evidenced by receipts or other
documentation. National Instruments will, at its option, repair or replace software media
that do not execute programming instructions if National Instruments receives notice of
such defects during the warranty period. National Instruments does not warrant that the
operation of the software shall be uninterrupted or error free.
A Return Material Authorization (RMA) number must be obtained from the factory and
clearly marked on the outside of the package before any equipment will be accepted for
warranty work. National Instruments will pay the shipping costs of returning to the
owner parts which are covered by warranty.
National Instruments believes that the information in this manual is accurate. The
document has been carefully reviewed for technical accuracy. In the event that technical
or typographical errors exist, National Instruments reserves the right to make changes to
subsequent editions of this document without prior notice to holders of this edition. The
reader should consult National Instruments if errors are suspected. In no event shall
National Instruments be liable for any damages arising out of or related to this document
or the information contained in it.
EXCEPT AS SPECIFIED HEREIN, NATIONAL INSTRUMENTS MAKES NO
WARRANTIES, EXPRESS OR IMPLIED, AND SPECIFICALLY DISCLAIMS ANY
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
CUSTOMER'S RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE
ON THE PART OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT
THERETOFORE PAID BY THE CUSTOMER. NATIONAL INSTRUMENTS WILL NOT BE
LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA, PROFITS, USE OF
PRODUCTS, OR INCIDENTAL OR CONSEQUENTIAL DAMAGES, EVEN IF ADVISED OF
THE POSSIBILITY THEREOF. This limitation of the liability of National Instruments will
apply regardless of the form of action, whether in contract or tort, including negligence.
Any action against National Instruments must be brought within one year after the cause
of action accrues. National Instruments shall not be liable for any delay in performance
due to causes beyond its reasonable control. The warranty provided herein does not
cover damages, defects, malfunctions, or service failures caused by owner's failure to
follow the National Instruments installation, operation, or maintenance instructions;
owner's modification of the product; owner's abuse, misuse, or negligent acts; and power
failure or surges, fire, flood, accident, actions of third parties, or other events outside
reasonable control.

Copyright
Under the copyright laws, this publication may not be reproduced or transmitted in any
form, electronic or mechanical, including photocopying, recording, storing in an
information retrieval system, or translating, in whole or in part, without the prior written
consent of National Instruments Corporation.
Trademarks
NAT4882®, NI-488®, Turbo488®, NI-488.2™, NI-488.2M™, and TNT4882C™are
trademarks of National Instruments Corporation.
Product and company names listed are trademarks or trade names of their respective
companies.
WARNING REGARDING MEDICAL AND CLINICAL
USE OF NATIONAL INSTRUMENTS PRODUCTS
National Instruments products are not designed with components and testing intended to
ensure a level of reliability suitable for use in treatment and diagnosis of humans.
Applications of National Instruments products involving medical or clinical treatment can
create a potential for accidental injury caused by product failure, or by errors on the part
of the user or application designer. Any use or application of National Instruments
products for or involving medical or clinical treatment must be performed by properly
trained and qualified medical personnel, and all traditional medical safeguards,
equipment, and procedures that are appropriate in the particular situation to prevent
serious injury or death should always continue to be used when National Instruments
products are being used. National Instruments products are NOT intended to be a
substitute for any form of established process, procedure, or equipment used to monitor
or safeguard human health and safety in medical or clinical treatment.

FCC/DOC Radio Frequency
Interference Compliance
This equipment generates and uses radio frequency energy and, if not installed and used
in strict accordance with the instructions in this manual, may cause interference to radio
and television reception. This equipment has been tested and found to comply with the
following two regulatory agencies:
Federal Communications Commission
This device complies with Part 15 of the Federal Communications Commission (FCC)
Rules for a Class B digital device. A Class B device is distinguishable from a Class A
device by the appearance of an FCC ID number located on the Class B device.
Canadian Department of Communications
This device complies with the limits for radio noise emissions from digital apparatus set
out in the Radio Interference Regulations of the Canadian Department of
Communications (DOC).
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites
applicables aux appareils numériques de classe B prescrites dans le règlement sur le
brouillage radioélectrique édicté par le ministère des communications du Canada.
Instructions to Users
These regulations are designed to provide reasonable protection against interference from
the equipment to radio and television reception in residential areas.
There is no guarantee that interference will not occur in a particular installation.
However, the chances of interference are much less if the equipment is installed and used
according to this instruction manual.
If the equipment does cause interference to radio or television reception, which can be
determined by turning the equipment on and off, one or more of the following
suggestions may reduce or eliminate the problem.
• Operate the equipment and the receiver on different branches of your AC electrical
system.
• Move the equipment away from the receiver with which it is interfering.
• Reorient or relocate the receiver’s antenna.
• Be sure that the equipment is plugged into a grounded outlet and that the grounding
has not been defeated with a cheater plug.

Notice to user: Changes or modifications not expressly approved by National
Instruments could void the user’s authority to operate the equipment
under the FCC Rules.
If necessary, consult National Instruments or an experienced radio/television technician
for additional suggestions. The following booklet prepared by the FCC may also be
helpful: How to Identify and Resolve Radio-TV Interference Problems. This booklet is
available from the U.S. Government Printing Office, Washington, DC 20402, Stock
Number 004-000-00345-4.
Bescheinigung des Herstellers/Importeurs
Hiermit wird bescheinigt, daß die AT-GPIB in Übereinstimmung mit den Bestimmungen
der Vfg. 1046/1984 funk entstört ist.
Der Detuschen Bundespost wurde das Inverkehrbringen dieses Gerätes angezeigt und die
Berechtigung zur Überprüfung der Serie auf Bestimmungen eingeräumt.

© National Instruments Corp. vii AT-GPIB/TNT for LynxOS
Contents
About This Manual ............................................................................................... ix
Organization of This Manual........................................................................... ix
Conventions Used in This Manual................................................................... x
Related Documentation ................................................................................... xi
Customer Communication ............................................................................... xi
Chapter 1
Introduction.............................................................................................................. 1-1
How to Use This Manual................................................................................. 1-1
What You Need to Get Started ........................................................................ 1-2
Hardware Description ...................................................................................... 1-2
AT-GPIB/TNT .................................................................................. 1-2
AT-GPIB ........................................................................................... 1-2
Software Description ....................................................................................... 1-2
Chapter 2
Hardware Configuration and Installation................................................... 2-1
Install the Hardware......................................................................................... 2-1
Configure the Hardware (Optional)................................................................. 2-3
Selecting the Base I/O Address ......................................................... 2-5
Selecting the Interrupt Request Line ................................................. 2-8
Selecting the DMA Channel ............................................................. 2-10
Using Programmed I/O for GPIB Transfers ..................................... 2-11
Setting the Shield Ground Configuration .......................................... 2-12
Chapter 3
Software Installation and Configuration ..................................................... 3-1
NI-488.2M Software Components................................................................... 3-1
Load the Distribution Disk............................................................................... 3-2
Install the NI-488.2M Software....................................................................... 3-2
Automatic Installation ...................................................................... 3-2
Manual Installation ........................................................................... 3-2
Configure the Software with ibconf (Optional)............................................... 3-4
Running ibconf ................................................................................. 3-4
Exiting ibconf .................................................................................... 3-4
Remove the NI-488.2M Driver (Optional) ...................................................... 3-5
Chapter 4
Installation Verification and Troubleshooting........................................... 4-1
Run the Software Installation Test Program.................................................... 4-1
Troubleshooting Error Messages....................................................... 4-1
Common Questions ......................................................................................... 4-2

Contents
AT-GPIB/TNT for LynxOS viii © National Instruments Corp.
Chapter 5
Using Your NI-488.2M Software..................................................................... 5-1
Introduction to ibic........................................................................................... 5-1
Programming Considerations........................................................................... 5-1
Appendix A
Hardware Specifications .................................................................................... A-1
Appendix B
Customer Communication................................................................................. B-1
Glossary...................................................................................................................... G-1
Figures
Figure 2-1. Installing the GPIB Board..................................................................... 2-2
Figure 2-2. AT-GPIB/TNT Parts Locator Diagram................................................. 2-4
Figure 2-3. AT-GPIB Parts Locator Diagram ......................................................... 2-5
Figure 2-4. Base I/O Address Switch Settings ........................................................ 2-7
Figure 2-5. IRQ Jumper Setting for IRQ11 (Default Setting) ................................. 2-9
Figure 2-6. Interrupt Jumper Setting for IRQ5 ........................................................ 2-9
Figure 2-7. DMA Channel Jumper Setting for DMA Channel 5 (Default)............. 2-11
Figure 2-8. DMA Jumper Setting for No DMA Channel ........................................ 2-11
Figure 2-9. Ground Configuration Jumper Settings ................................................ 2-12
Tables
Table 2-1. Hardware Default Settings .................................................................... 2-1
Table 2-2. Possible Base I/O Address Switch Settings .......................................... 2-6
Table 2-3. DMA Channels ..................................................................................... 2-10
Table A-1. Electrical Characteristics for the AT-GPIB/TNT ................................. A-1
Table A-2. Electrical Characteristics for the AT-GPIB .......................................... A-1
Table A-3. Physical Characteristics ........................................................................ A-1
Table A-4. Environmental Characteristics .............................................................. A-1

© National Instruments Corp. ix AT-GPIB/TNT for LynxOS
About This Manual
This manual contains instructions to help you install and configure the National
Instruments AT-GPIB or AT-GPIB/TNT interface board and the NI-488.2 multitasking
software (NI-488.2M) driver for the LynxOS operating system, version 2.1 and higher.
The hardware and software are intended for use on personal computers equipped with an
Intel 386 or an Intel 486 processor and an ISA-compatible bus. This manual is meant to
be used with the NI-488.2M Software Reference Manual.
This manual uses the term AT-GPIB/TNT to refer to a National Instruments GPIB board
equipped with the TNT4882C ASIC. The term AT-GPIB refers to a National Instruments
GPIB board equipped with the NAT4882 and Turbo488 ASICs. This manual uses the
term GPIB board in cases where the material can apply to either board. Both boards are
designed for use with the ISA (PC AT) bus.
This manual assumes that you are familiar with the LynxOS operating system.
Organization of This Manual
This manual is organized as follows:
• Chapter 1, Introduction, explains how to use this manual, lists what you need to get
started, and briefly describes the AT-GPIB/TNT and AT-GPIB interface boards and
the NI-488.2M software.
• Chapter 2, Hardware Configuration and Installation, contains instructions to help
you configure and install your GPIB board.
• Chapter 3, Software Installation and Configuration, contains instructions to help you
install and configure your NI-488.2M software.
• Chapter 4, Installation Verification and Troubleshooting, describes how to verify the
software installation and how to troubleshoot problems.
• Chapter 5, Using Your NI-488.2M Software, describes the ibic utility and lists
some programming considerations.
• Appendix A, Hardware Specifications, describes the physical characteristics of the
AT-GPIB/TNT board and AT-GPIB board and the recommended operating
conditions of the boards.
• Appendix B, Customer Communication, contains forms you can use to request help
from National Instruments or to comment on our products and manuals.

About This Manual
AT-GPIB/TNT for LynxOS x © National Instruments Corp.
• The Glossary contains an alphabetical list and a description of the terms, including
abbreviations, acronyms, metric prefixes, mnemonics, and symbols, that this manual
uses.
Conventions Used in This Manual
This manual uses the following conventions.
italic Italic text denotes emphasis, a cross reference, or an
introduction to a key concept.
bold italic Bold italic text denotes a note, caution, or warning.
monospace Lowercase text in this font denotes text or characters that you
literally input from the keyboard. This font also denotes
sections of code, programming examples, syntax examples,
the proper names of disk drives, paths, directories, programs,
subprograms, subroutines, device names, functions, variables,
filenames, extensions, and statements and comments taken
from program code.
bold monospace Bold text in this font denotes the messages and responses that
the computer automatically prints to the screen.
AT-GPIB/TNT AT-GPIB/TNT refers to a National Instruments GPIB board
for the ISA (PC AT) bus equipped with the TNT4882C ASIC.
AT-GPIB AT-GPIB refers to a National Instruments GPIB board for the
ISA (PC AT) bus equipped with the NAT4882 and Turbo488
ASICs.
GPIB board GPIB board refers generically to either the AT-GPIB/TNT or
AT-GPIB board in cases where material can apply to either
board.
NI-488.2M NI-488.2M refers to the NI-488.2M software for LynxOS.
LynxOS LynxOS refers to the LynxOS operating system from Lynx
Real-Time Systems, Inc., which runs on computers equipped
with an Intel 386 or an Intel 486 processor.
The Glossary lists abbreviations, acronyms, metric prefixes, mnemonics, symbols, and
terms.

About This Manual
© National Instruments Corp. xi AT-GPIB/TNT for LynxOS
Related Documentation
The following documents contain information that you may find helpful as you read this
manual.
•NI-488.2M Software Reference Manual, National Instruments Corp.
• ANSI/IEEE Standard 488.1-1987, IEEE Standard Digital Interface for
Programmable Instrumentation
• ANSI/IEEE Standard 488.2-1987, IEEE Standard Codes, Formats, Protocols, and
Common Commands
•LynxOS User's Manual, Volumes 1 and 2, Lynx Real-Time Systems, Inc.
Customer Communication
National Instruments wants to receive your comments on our products and manuals. We
are interested in the applications you develop with our products, and we want to help if
you have problems with them. To make it easy for you to contact us, this manual
contains comment and configuration forms for you to complete. These forms are in
Appendix B, Customer Communication, at the end of this manual.

© National Instruments Corp. 1-1 AT-GPIB/TNT for LynxOS
Chapter 1
Introduction
This chapter explains how to use this manual, lists what you need to get started, and
briefly describes the AT-GPIB/TNT and AT-GPIB interface boards and the NI-488.2M
software.
How to Use This Manual
No
Chapter 4
Troubleshooting
Yes
No
Need to
Change Software
Settings?
Passes?
Install the Software
Verify the Installation
Configure the Software
Chapter 3
Yes
Chapter 5
NI-488.2M Software
Reference Manual
Review Programming
Considerations
Write Application Program
Run ibic
Chapter 1
Chapter 2
Install the Hardware
Gather What You Need
to Get Started
Yes
No
Need to
Change Hardware
Settings? Configure the Hardware

Introduction Chapter 1
AT-GPIB/TNT for LynxOS 1-2 © National Instruments Corp.
What You Need to Get Started
AT-GPIB/TNT board
or
AT-GPIB board
3.5 in. NI-488.2M Distribution Disk for the AT-GPIB/TNT and LynxOS
LynxOS operating system version 2.1 or higher installed on your computer
Super-user privilege
Hardware Description
AT-GPIB/TNT
The AT-GPIB/TNT board is equipped with the TNT4882C ASIC, which combines the
circuitry of the NAT4882 ASIC, the Turbo488 performance-enhancing ASIC, and the
GPIB transceivers. The AT-GPIB/TNT transforms any PC AT compatible computer into
a full-functioning GPIB Talker/Listener/Controller. The TNT4882C ASIC also
implements the HS488 high-speed protocol. The AT-GPIB/TNT board is fully
compatible with all versions of AT-GPIB hardware.
You can use standard GPIB cables to connect the AT-GPIB/TNT with up to 14
instruments. If you want to use more than 14 instruments, you can order a bus extender
or expander from National Instruments. Refer to Appendix A, Hardware Specifications,
for AT-GPIB/TNT specifications.
AT-GPIB
The AT-GPIB board is equipped with NAT4882 and Turbo488 ASICs. It also transforms
any PC AT compatible computer with 16-bit slots into a full-functioning IEEE 488.2
Talker/Listener/Controller. The NAT4882 controller chip is fully compatible with the
IEEE 488.2 standard. The Turbo488 performance-enhancing ASIC boosts GPIB read
and write transfer rates.
You can connect the AT-GPIB board with up to 13 instruments. If you want to use more
than 13 instruments, you can order a bus extender or expander from National
Instruments. Refer to Appendix A, Hardware Specifications, for AT-GPIB
specifications.
Software Description
The NI-488.2M software includes a driver, an interactive control program, several utility
programs, and a C language interface. The NI-488.2M software and GPIB hardware
transform any PC AT compatible computer with at least one ISA slot running LynxOS
into a GPIB Talker/Listener/Controller with complete communications and bus
management capabilities.

© National Instruments Corp. 2-1 AT-GPIB/TNT for LynxOS
Chapter 2
Hardware Configuration and Installation
This chapter contains instructions to help you configure and install your GPIB board.
You must have super-user privelege to install the board in a LynxOS-based computer.
Warning: Several components on your GPIB board can be damaged by electrostatic
discharge. To avoid such damage in handling the board, touch the
antistatic plastic package to a metal part of your computer chassis before
removing the board from the package.
The GPIB board default settings are suitable for most PC AT compatible computer
systems. However, if the default settings conflict with another device in your system or
if you need to install more than one GPIB board, you must reconfigure the hardware.
You can verify the configuration settings of previously installed GPIB boards by looking
at the file /sys/devices/ibinfo.c.
Table 2-1 shows the default settings for the switches and jumpers on the GPIB board.
Table 2-1. Hardware Default Settings
GPIB Board Setting Default
Base I/O Address (hex) 2C0
DMA Channel 5
Interrupt Line (IRQ) 11
To modify the default settings of the GPIB board, refer to the Configure the Hardware
section of this chapter. If you do not need to reconfigure the board, refer to the Install the
Hardware section.
Install the Hardware
Keep in mind the following naming conventions as you read through this manual.
•AT-GPIB/TNT refers to a National Instruments GPIB board for the ISA (PC AT) bus
equipped with the TNT4882C ASIC.
•AT-GPIB refers to a National Instruments GPIB board for the ISA (PC AT) bus
equipped with the NAT4882 and Turbo488 ASICs.
•GPIB board refers generically to either the AT-GPIB/TNT or AT-GPIB board in
cases where the material can apply to either board.

Hardware Configuration and Installation Chapter 2
AT-GPIB/TNT for LynxOS 2-2 © National Instruments Corp.
Perform the following steps to install the GPIB board:
1. Log on to the computer as root.
2. Shut down your system by entering the following command:
sync;sync;reboot -ah
3. Turn off your computer. Keep the computer plugged in so that it remains grounded
while you install the GPIB board.
4. Remove the top cover or access port of the I/O channel.
5. Remove the expansion slot cover on the back panel of the computer.
6. Insert the GPIB board into any unused 16-bit ISA slot with the GPIB connector
sticking out of the opening on the back panel, as shown in Figure 2-1. It might be a
tight fit, but do not force the board into place. You can install the AT-GPIB/TNT in
an 8-bit slot, if necessary. When you use an 8-bit slot, you must disable DMA and
use only interrupt request lines 3, 4, 5, 6, or 7.
1
3
2
1 GPIB board
2 Back panel
3 PC AT plug-in board
Figure 2-1. Installing the GPIB Board

Chapter 2 Hardware Configuration and Installation
© National Instruments Corp. 2-3 AT-GPIB/TNT for LynxOS
7. Screw the mounting bracket of the GPIB board to the back panel rail of the
computer.
8. Check the installation.
9. Replace the top cover or access port to the I/O channel.
10. Turn on your computer.
After you have installed your board, you are ready to install the NI-488.2 software. Refer
to Chapter 3, Software Installation and Configuration.
Configure the Hardware (Optional)
Follow the instructions in this section to change the hardware default settings of the GPIB
board. The GPIB board default settings are suitable for most PC AT compatible
computer systems. However, if the default settings conflict with another device in your
system or if you need to install more than one GPIB board, you must reconfigure the
hardware.
The default settings for the switches and jumpers on the GPIB board are:
• Base I/O Address (hex): 2C0
• DMA Channel: 5
• Interrupt Request Line (IRQ): 11

Hardware Configuration and Installation Chapter 2
AT-GPIB/TNT for LynxOS 2-4 © National Instruments Corp.
Figure 2-2 shows the location of the configuration jumpers and switches on the
AT-GPIB/TNT board.
1 Product Name, Revision Letter, and Assembly Number
2 Base I/O Address
3 Serial Number
4 DMA Channel
5 Interrupt Level
6 Shield Ground
Figure 2-2. AT-GPIB/TNT Parts Locator Diagram

Chapter 2 Hardware Configuration and Installation
© National Instruments Corp. 2-5 AT-GPIB/TNT for LynxOS
Figure 2-3 shows the location of the configuration jumpers and switches on the AT-GPIB
board.
1 Product Name, Revision Letter, Assembly Number, and Serial Number
2 DMA Channel
3 Interrupt Level
4 Base I/O Address
5 Shield Ground
Figure 2-3. AT-GPIB Parts Locator Diagram
Selecting the Base I/O Address
PC AT compatible computers have a segment of memory reserved for input and output.
This segment is referred to as the I/O address space. The base I/O address of a PC AT
plug-in board such as the GPIB board is the first position in the I/O address space
occupied by the plug-in interface board.
By default, the GPIB board is configured to use base I/O address 2C0 hex. With this
setting, the board uses the I/O address space 2C0 hex through 2DF hex. If this address
range is already in use by another device or if you are installing more than one board,
follow these steps to reconfigure the base I/O address setting.

Hardware Configuration and Installation Chapter 2
AT-GPIB/TNT for LynxOS 2-6 © National Instruments Corp.
1. Choose a new base I/O address setting.
You can configure the base I/O addresses to any setting between 0x100 and 0x3E0
that is a multiple of 0x20 hex. If you are installing more than one GPIB board, each
board must use a unique base I/O address.
Table 2-2 lists the possible switch settings, the corresponding base I/O addresses,
and the I/O address space used for each setting.
Table 2-2. Possible Base I/O Address Switch Settings
Switch Setting
A9 A8 A7 A6 A5 Base I/O Address (hex) I/O Address Space Used (hex)
01000 100 100 to 11F
01001 120 120 to 13F
01010 140 140 to 15F
01011 160 160 to 17F
01100 180 180 to 19F
01101 1A0 1A0to1BF
01110 1C0 1C0to1DF
01111 1E0 1E0 to 1FF
10000 200 200 to 21F
10001 220 220 to 23F
10010 240 240 to 25F
10011 260 260 to 27F
10100 280 280 to 29F
10101 2A0 2A0to2BF
10110 2C0 2C0to2DF
10111 2E0 2E0 to 2FF
11000 300 300 to 31F
11001 320 320 to 33F
11010 340 340 to 35F
11011 360 360 to 37F
11100 380 380 to 39F
11101 3A0 3A0to3BF
11110 3C0 3C0to3DF
11111 3E0 3E0 to 3FF

Chapter 2 Hardware Configuration and Installation
© National Instruments Corp. 2-7 AT-GPIB/TNT for LynxOS
2. Locate the base I/O address switch at SW1 on your AT-GPIB/TNT board or at U25
on your AT-GPIB board. Refer to the appropriate parts locator diagram, Figure 2-2
or 2-3.
3. Change the switch settings to configure the GPIB board to the new base I/O address.
Press down on the side marked OFF to select a binary value of 1 for the
corresponding address bit. Press down on the ON side of the switch to select a
binary value of 0. Refer to Figure 2-4 for an example of the switch settings and
corresponding base I/O addresses.
Push this side down (OFF) for logic 1
Push this side down (ON) for logic 0
Switch Set to Base I/O
Address hex 300
Switch Set to Default
Base I/OAddress hex 2C0
9
8
7
6
5
Binary Hex
0
0
3
9
8
7
6
5
Binary Hex
0
C
2
10
1
1
0
0
0
0
0
0
0
0
1
0
1
1
0
0
0
0
0
0
1 2 345 12345
10
OFF OFF
Figure 2-4. Base I/O Address Switch Settings