EquityTM III
User’s Guide
Equity™ III
User’s Guide
Seiko Epson Corporation makes no representations or warranties, either express or implied, by or
with respect to anything in this manual, and shall not be liable for any implied warranties of
merchantability and fitness for a particular purpose or for any indirect, special or consequential
damages. Some states do not allow the exclusion of incidental or consequential damages, so this
exclusion may not apply to you.
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or
transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or
otherwise, without the prior written permission of Seiko Epson Corporation. No patent liability is
assumed with respect to the use of information contained herein. While every precaution has been
taken in the preparation of this publication, Seiko Epson Corporation assumes no responsibility
for errors or omissions. Nor is any liability assumed for damages resulting from the use of the
information contained herein. Further, this publication and features described herein are subject to
change without notice.
Epson is a registered trademark of Seiko Epson Corporation.
Equity is a trademark of Epson America, Inc.
IBM is a registered trademark and AT and XT are trademarks of International Business Machines
MS and GW are trademarks of Microsoft Corp.
XTREE is a registered trademark of Executive Systems, Inc.
Copyright 0 1986 by Seiko Epson Corporation
Nagano, Japan
This equipment generates and uses radio frequency energy and if not installed and
used properly, that is, in strict accordance with the manufacturer’s instructions,
may cause interference to radio and television reception. It has been type tested
and found to comply with the limits for a Class B computing device in accordance
with the specifications in Subpart J of Part 15 of FCC rules, which are designed to
provide reasonable protection against such interference in a residential installation. However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause interference to radio or television reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:
Reorient the receiving antenna
Relocate the computer with respect to the receiver
Move the computer away from the receiver
Plug the computer into a different outlet so that computer and receiver are on
different branch circuits.
If necessary, the user should consult the dealer or an experienced radio/television
technician for additional suggestions. The user may find the following booklet
prepared by the Federal Communications Commission 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 No. 004-000-00345-4.
Note: If the interference stops, it was probably caused by the computer or its
peripheral devices. To further isolate the problem:
Disconnect the peripheral devices and their input/output cables one at a
time. If the interference stops, it is caused by either the peripheral device or
its I/O cable. These devices usually require shielded I/O cables. For Epson
peripheral devices, you can obtain the proper shielded cable from your
dealer. For non-Epson peripheral devices contact the manufacturer or
dealer for assistance.
This equipment has been certified to comply with the limits for a Class B computing device, pursuant to Subpart J of Part 15 of FCC Rules. Only peripherals (computer input/output devices, terminals, printers, etc.) certified to comply with the
Class B limits may be attached to this computer. Operation with non-certified
peripherals is likely to result in interference to radio and TV reception.
The connection of a non-shielded equipment interface cable to this equipment will
invalidate the FCC Certification of this device and may cause interference levels
which exceed the limits established by the FCC for this equipment.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Use this Manual . . . . . . . . . . . . . . . . . . . . . . . .
Setting Up Your System . . . . . . . . . . . . . . . . . . . . . . . .
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Choosing a Location . . . . . . . . . . . . . . . . . . . . . . . . . . .
Arranging the Components . . . . . . . . . . . . . . . . . . . . .
The Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the disk drive protector sheet . . . . . . . . .
The Rear Panel ......................................................
Connecting the Power Cord . . . . . . . . . . . . . . . . . . . . .
Connecting a Video Monitor . . . . . . . . . . . . . . . . . . . .
Connecting the Keyboard . . . . . . . . . . . . . . . . . . . . . . .
Connecting a Printer . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parallel interface . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Serial interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The Equity III character set . . . . . . . . . . . . . . . . . . . .
Checking the DIP Switches . . . . . . . . . . . . . . . . . . . . . .
Using the Equity III . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Key Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Powering Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Initial setup procedure . . . . . . . . . . . . . . . . . . . . . . . .
Initial screen display . . . . . . . . . . . . . . . . . . . . . . . . .
Inserting and Removing Diskettes . . . . . . . . . . . . . . . .
Special Keys on the Equity III Keyboard . . . . . . . . . . .
Resetting the Computer . . . . . . . . . . . . . . . . . . . . . . . . .
Turning Off the Computer . . . . . . . . . . . . . . . . . . . . . .
Using Disks and Disk Drives . . . . . . . . . . . . . . . . . . . .
How Disks Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Choosing Diskettes for the Equity III . . . . . . . . . . . . . .
Drive and diskette incompatibilities . . . . . . . . . . . . .
Caring for your Disks and Disk Drives . . . . . . . . . . . .
Protecting your Data . . . . . . . . . . . . . . . . . . . . . . . . . . .
Making backup copies . . . . . . . . . . . . . . . . . . . . . . .
Write-protecting diskettes . . . . . . . . . . . . . . . . . . . . .
Using a Single Floppy Disk Drive . . . . . . . . . . . . . . . .
Using a Hard Disk Drive . . . . . . . . . . . . . . . . . . . . . . . .
Installing Option Cards . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Cover . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing an Option Card . . . . . . . . . . . . . . . . . . . . . . .
Post-Installation Setup . . . . . . . . . . . . . . . . . . . . . . . . .
Removing an Option Card . . . . . . . . . . . . . . . . . . . . . .
Setting the DIP Switches . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Cover . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using an Epson Mouse . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The Computer Fails to Start Up . . . . . . . . . . . . . . . . . .
The Video Display Does Not Appear . . . . . . . . . . . . .
The Computer Hangs Up or Freezes . . . . . . . . . . . . . .
Floppy Disk Problems . . . . . . . . . . . . . . . . . . . . . . . . . .
Hard Disk Problems . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Printer Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option Card Problems . . . . . . . . . . . . . . . . . . . . . . . . .
Equity III Specifications . . . . . . . . . . . . . . . . . . . . . . . . .
CPU and Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mass Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental Requirements . . . . . . . . . . . . . . . . . . . .
Physical Characteristics (CPU only) . . . . . . . . . . . . . .
Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . .
options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 Front panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3 Rear panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4 Connecting the power cord . . . . . . . . . . . . . . . . . . . . . .
1-5 Connecting the monitor . . . . . . . . . . . . . . . . . . . . . . . .
1-6 Connecting the keyboard . . . . . . . . . . . . . . . . . . . . . . .
1-7 Adjusting keyboard legs . . . . . . . . . . . . . . . . . . . . . . . .
1-8 Placing the printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-9 Connecting the printer . . . . . . . . . . . . . . . . . . . . . . . . .
2-1 Locking the key lock . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2 Inserting a diskette . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3 Special keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1 Write-protect notch . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1 System arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . .
Top cover screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the cover . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option slots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16-bit and B-bit option cards . . . . . . . . . . . . . . . . . . . . .
4-5 Inserting an option card . . . . . . . . . . . . . . . . . . . . . . . .
4-6 Location of DIP switches . . . . . . . . . . . . . . . . . . . . . . .
Special key functions . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1 Drive/diskette compatibility . . . . . . . . . . . . . . . . . . . . .
4-1 DIP switch functions . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2 PROM size settings . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Your Epson® Equity™ III personal computer is a versatile, highperformance system which offers you a wide variety of choices. First you
choose between two models of the Equity III main unit, then you select
the monitor and peripherals you want to use with it to assemble the
configuration that does the most for you.
The Equity III main unit is available in these models:
One 1.2MB (high-density) floppy disk drive
One 1.2MB floppy disk drive and one 20MB internal hard disk drive
Both models include 640KB of memory. You can install additional drives
in your Equity III to increase its storage capacity: a second floppy disk
drive (either 360KB or 1.2MB) and one or more hard disks (20MB or
40MB, depending on your configuration).
Optional cards and external devices further expand the capabilities
of your Equity III. Its built-in serial and parallel interfaces let you connect almost any peripheral device you choose. Here are some options
you can use with your system:
Monochrome monitor
Monochrome video card
RGB color monitor
Color/graphics video card
Memory expansion card
80287 Math coprocessor
Mouse and mouse interface card
An Epson printer or plotter
You can also use most cards for the IBM® Personal Computer,
PC XT™, and PC AT™ on the Equity III. Check with your Epson dealer
from time to time to find out which peripherals and option cards are
The Equity III comes with the MS”-DOS operating system and the
GW™-BASIC programming language. If you have used MS-DOS before
on another computer, you will find that it works the same on the Equity
III. Be sure to refer to your Equity MS-DOS manual, however, for
descriptions of the special utility programs added by Epson.
You may have purchased other software as well; you can use most
software products designed for the IBM PC, PC XT, and PC AT on your
Equity III. Refer to your software program documentation for information on using the software.
Additionally, the Equity III supports multi-user and multi-tasking
with the appropriate operating system. Consult your Epson dealer for
more information.
How to Use this Manual
This user’s guide explains how to set up and care for your Equity III.
It also describes how to start using your system and install optional
Follow the instructions in Chapter 1 to set up your system. Chapter 2
tells you how to turn on the Equity III and describes some general operational procedures. Chapter 3 explains how disks and disk drives work
and shows how to use them. Chapter 4 describes how to install and
remove option cards. If you encounter a problem, refer to Chapter 5 on
Appendix A presents the Equity III’s hardware specifications and
Appendix B is a glossary of computer terms this manual uses. Refer to
the glossary whenever you come across an unfamiliar word. You may
even want to glance through it before you start reading this book.
Although illustrations in this manual show the Equity III configuration with the internal hard disk, the setup and operational procedures
apply to all configurations. You may not need to read everything in this
book; some sections may describe a particular option or accessory you
do not have.
Chapter 1
Setting Up Your System
It won’t take you long to get your Epson Equity III personal computer up and running. This chapter describes the Equity III main unit and
shows you how to set up your system and make any necessary adjustments.
When you unpack your Equity III, you should find the following:
The main unit and power cord
The keyboard with cable
An MS-DOS operating system diskette (version 3.1) and a
GW-BASIC programming language diskette with supplemental
MS-DOS utilities
An MS-DOS manual and a GW-BASIC manual
A diagnostics diskette and a diagnostics manual
This Equity III User’s Guide
In addition to these items, you probably bought a compatible video
monitor and video card, such as the Epson monochrome monitor MBM2095-E and monochrome video card or the Epson RGB color monitor
MCM-4035N-E and color/graphics video card.
As you remove your system components from their cartons, be sure
to inspect each piece. If anything is missing, looks damaged, or seems
wrong, consult your Epson dealer.
You’ll also find a registration card with the main unit. Fill this card
out now and mail it to Epson. With your registration card on file, Epson
can send you update information.
Be sure to keep your packing materials. They provide the best protection possible for your computer if you need to move or ship it later.
Choosing a Location
Before you set up your new system, choose an appropriate place.
Whether you use your computer at home or in the office, you need to
find a comfortable, convenient location where it can run properly.
Choose a location that provides the following:
A large, sturdy desk or table. Make sure it can easily support the
weight of your system, including all its components.
A flat, hard surface. Soft surfaces like beds and carpeted floors
attract static electricity, which erases data on your disks and can
damage the computer’s circuitry. Soft surfaces also prevent proper
Good air circulation. Air must be able to move freely under the system as well as behind it. Leave several inches of space around the
computer to allow ventilation.
Moderate environmental conditions. You need to protect your computer from extremes in temperature, humidity, dust, and smoke.
Avoid direct sunlight or any other source of heat. High humidity also
hinders operation, so select a cool, dry area. Because you can’t risk
losing data stored on disk, do not expose your computer to dust and
smoke which can damage disks and disk drives.
Appropriate power sources. To prevent static charges, connect all
your equipment to 3-prong, 120-volt grounded outlets. You need
one outlet for the main unit, one for the monitor, and additional
outlets for a printer and any other peripherals. The auxiliary power
outlet on the rear panel of the Equity III reduces the number of wall
outlets you need.
No electromagnetic interference. Locate your system away from any
electrical device that generates an electromagnetic field. Surprisingly
even a telephone can cause trouble, especially if you keep diskettes
right next to it.
When you find the ideal location for your Equity III, you can start to
set up your system.
Arranging the Components
First decide how you want to arrange the different parts of your system. Figure 1-1 shows a typical setup.
Figure 1-1. System arrangement
Of course, if you have special computer furniture or want to customize your setup, you can arrange your system components to suit your
own particular needs.
Before you connect the cables, take a look at the front and rear panels of the main unit.
The Front Panel
Figure 1-2 identifies the various components on the front panel.
Floppy disk drive
LED lamp
Disk lock/
release latch
LED lamp
Slot for
disk drive
Figure 1-2. Front panel
The front panel components work as follows:
Disk lock/release latch. To lock a diskette in place, turn this latch
clockwise until it is vertical. To release a diskette, turn it counterclockwise until it is horizontal.
Floppy disk drive LED lamp. A red light indicates that the drive is
being accessed. To avoid losing data, never remove a diskette or turn
off the computer’s power when this light is on.
Floppy disk drive. The top drive is a floppy disk drive that uses highdensity (1.2MB) diskettes.
Slot for optional disk drive. You can add a second floppy disk drive
1.2MB or 360KB) or hard disk drive in this slot. All Equity units
come with at least one 1.2MB floppy disk drive.
Hard disk drive LED lamp. A red light indicates that the drive is
being accessed. To avoid losing data, do not turn off the computer’s
power when this light is on.
Power LED lamp. A red light indicates the power is on. Use the
power switch on the right side of the main unit to turn it on and off.
Key Lock. Locks the main unit and keyboard. Turn the key clockwise to lock the computer and counterclockwise to unlock it. You
can remove the key in either position.
RESET button. Press this button to reset the computer. When an
operating system diskette is in the top drive or running on the hard
disk, you can press the RESET button to reboot it.
Removing the disk drive protector sheet
A cardboard sheet occupies the diskette slot in the floppy disk drive.
This sheet is inserted at the factory to protect the read/write heads. Be
sure to remove it before you connect any cables. Turn the latch that
covers the disk slot counter clockwise until it is horizontal. Carefully pull
out the sheet. If you have an optional 360KB drive as well, press the
button marked PUSH to release the protector sheet.
Save the protector sheet and reinsert it whenever you move the computer, even if you just move it to another part of the room. If you don’t
plan to use your computer for a week or more, such as when you go on
vacation, reinsert the protector sheet to help prevent dust from entering
the disk drive.
The Rear Panel
Now look at the rear panel to identify the input/output ports. Figure
1-3 shows where you connect your peripherals.
WARNING: Connect all your peripherals before you plug in the power
cable. After you plug in the power cable, always turn off
the power switch before you connect or disconnect any
cable socket
Option card
access slots
Figure 1-3. Rear panel
The rear panel components work as follows:
AC Power inlet. Plug the power cord into the main unit here. Be sure
the power switch is off when you plug the power cord into an outlet.
Power consumption should not exceed 5 amps.
AC Power outlet. Auxiliary power outlet. Some monitors (and other
types of peripherals) can be plugged into the main unit here, instead
of a wall outlet. The main unit’s power switch controls the monitor
or peripheral connected to this outlet. Power consumption should
not exceed .4 amps.
Printer parallel port. Allows you to connect a peripheral with a parallel interface, such as a printer or a plotter.
RS-232C serial port. Allows you to connect a peripheral with a serial
interface, such as a modem, another computer, or a printer.
Keyboard cable socket. Plug in the keyboard cable here.
Option card access slots. The Equity III has eight slots to hold up to
eight option cards. Option cards allow your computer to control
your peripherals or enhance your computer’s performance. One option card slot holds the hard disk controller card and another must
hold a monochrome or a color/graphics video card to control your
monitor. You can use the other slots to install additional options,
such as a memory expansion card or a mouse.
Connecting the Power Cord
Insert the power cord into the AC power inlet on the far left side of the
rear panel, as shown in Figure 1-4. To avoid an electric shock, be sure to
plug this end into the main unit before plugging the other end into the wall
socket. For now, do not plug the power cord into an electrical outlet.
Figure 1-4. Connecting the power cord
Connecting a Video Monitor
To connect the video monitor, place your monitor on top of or near
the Equity III main unit. It is easiest to connect the monitor cable if the
backs of the monitor and the main unit face you.
Note: Your dealer probably installed a video card in your main unit to
control your monitor. If not, you need to install it before you can
connect your monitor. See Chapter 4 for instructions on how to
remove the main unit’s cover and install an option card. You also
need to check DIP switch 1-2 inside the main unit to be sure it
matches your monitor. See “Setting the DIP Switches” in Chapter 4.
The procedure you use to connect your monitor to the main unit
depends on the type of monitor you have. Refer to your monitor manual
for detailed instructions or follow these general guidelines:
1. If necessary, connect the monitor cable to the monitor. (Some monitors come with permanently attached cables.)
2. Connect the appropriate end of the monitor cable to your monochrome or color/graphics card connector at the back of the main
unit, as shown in Figure 1-5. If the plug has retaining screws, tighten
them with a screwdriver.
Figure 1-5. Connecting the monitor
The monitor type must match the video card in the main unit. If you
have a color card, you can use one of two connectors: a nine-pin, female
D-connector for RGB monitors or an RCA connector for composite
video monitors.
3. Plug the monitor power cable into an electrical outlet.
Note: You can plug some monochrome monitors into the auxiliary
outlet at the back of the Equity III main unit, if the plug fits
and the monitor’s power consumption does not exceed .4
Connecting the Keyboard
After you connect your monitor to the main unit, you can connect
the keyboard. The keyboard cable is attached to the keyboard at one
end. Insert the other end into the socket marked KEYBOARD on the rear
panel of the main unit, as shown in Figure 1-6. Do not force the connector, but make sure you insert it all the way.
Figure 1-6. Connecting the keyboard
You can use the keyboard in various positions-including flat on a
desk or on your lap. You can also tilt the angle of the keyboard by adjusting the legs on the bottom. To adjust the legs, turn the keyboard over and
lift each leg upward until it locks into place, as Figure 1-7 shows.
Figure 1-7. Adjusting keyboard legs
To disconnect the keyboard, unplug the connector from the rear
panel. Be sure to pull the connector straight out from the main unit.
Connecting a Printer
The Equity III has built-in parallel and serial interfaces. You can easily connect a printer or plotter that has either type of interface-just
follow the instructions below. Epson offers a full range of printer products. Consult your dealer for more information.
Parallel interface
The Equity III parallel interface is Centronics-compatible and uses a
DB-25S connector. Most Epson printers have parallel interfaces.
To connect a printer to the main unit, you need an IBM PC ATcompatible printer cable. If you are not sure which one you need, consult
your Epson dealer. Once you have a printer cable, follow these steps to
connect your printer to the parallel interface on the main unit:
1. Place the printer next to your system, as shown in Figure 1-8.
Figure 1-8. Placing the printer
2. Before you connect the printer, be sure the power switches on both
the main unit and the monitor are off.
3. One end of the printer cable has a 25-pin male D-connector. (Refer to
your printer manual to determine which end this is.) Connect this
end to the socket marked PRINTER on the back panel of the main
unit. If the plug has retaining screws, tighten them with a small
4. Connect the other end of the cable to the printer. To secure the cable,
tighten the squeeze locks at each side of the printer port and push
them into the connectors on each side of the cable. Figure 1-9 shows
how to connect the cable to the printer.
Figure 1-9. Connecting the printer
5. Plug the printer’s power cable into an electrical outlet.
Serial interface
If you have a printer (or another peripheral such as a modem) with a
serial interface, connect it to the port marked RS-232C at the back of the
main unit. The Equity III uses a DB-9P connector, so be sure you have a
compatible cable. To connect a serial device, follow the same steps above
for connecting a parallel device.
You need to ensure the RS-232C serial port is set up so it functions
properly. If you are using the port for a serial printer, you must also
redirect printer output to the serial instead of the parallel port. Use the
MS-DOS SETMODE program (or the MODE command) to make these
changes. See your MS-DOS manual for instructions.
The Equity III character set
The Equity III uses a special character set that assigns graphics and
international characters to some of the ASCII codes. In most cases, if you
try to print these characters on a standard printer, you get italic characters instead. Some Epson printers support the IBM character set (the
character set the Equity III uses) as a standard feature, and others can be
adapted. In addition, some application programs can print the special
graphic characters on a standard printer when you use a special printer
driver program. Ask your Epson dealer for more information.
Checking the DIP Switches
Inside the Equity III main unit, there are ten DIP (dual-line package) switches which give your computer information about memory
size, monitor type, floppy disk drive interface, and which built-in interfaces are in use. Each switch has two positions: on and off. You may need
to change these settings if you add options (such as extra memory or disk
drives) to your system.
Although your dealer probably set your DIP switches for you, you
may want to look at the DIP switch settings in your main unit to be sure
they match your system configuration. If your system does not work
properly, check the DIP switches to see if they are set correctly.
To access the DIP switches, you need to remove the cover from the
Equity III main unit. If you want to check them now, follow the instructions in Chapter 4 under “Removing the Cover” and then “Setting the
DIP Switches.”
Chapter 2
Using the Equity III
After you set up your system, you’re ready to turn on the power and
start using your Equity III computer. But before you turn it on, read the
following safety rules.
Safety Rules
Follow these rules to avoid accidentally damaging your computer or
injuring yourself:
Never turn the computer on or off with a protector sheet in the disk
Do not attempt to dismantle any part of the computer. Only remove
the top cover to install and remove option cards or to set the DIP
switches. If there is a hardware problem you cannot solve after reading Chapter 5 on troubleshooting, or if you want to install an
optional 80287 math coprocessor, consult your Epson dealer.
Always turn off the power, disconnect the computer’s power cord,
and wait a few minutes before you remove the computer’s cover.
Do not unplug cables from the computer when the power switch is
Never turn off or reset your computer while a disk drive light is on.
This can destroy data stored on disk or make a whole disk unusable.
Always wait at least 5 seconds after you switch the power off before
you switch it on again. Turning the power off and on rapidly can
damage the computer’s circuitry.
Do not leave a beverage on top of or next to your system or any of its
components. Spilled liquid can damage the circuitry of your components.
Key Lock
The key lock allows you to disable the keyboard and lock the top
cover of the main unit for security. This provides a safeguard against
someone accessing confidential information or altering your computer’s
internal hardware. The key lock also lets you run an application program, such as a screen demonstration, while disabling the keyboard so
no one can alter the display. With the keyboard locked, the computer
does not respond to anything you enter.
You can lock the system whether the power is on or off. To lock it,
insert the key with the notch pointing up and turn it clockwise as shown
in Figure 2-1. You need to press it in slightly when you turn it. To unlock
it, insert the key with the notch pointing to the right and turn the key
counterclockwise. You can remove the key in either position.
Figure 2-1. Locking the key lock
Your Equity III comes with two keys; it is a good idea to store them in
different locations in case you misplace one. Store both keys where they
are safe.
Be sure the computer is unlocked before you try to use the keyboard.
Otherwise, it does not respond to anything you enter.
Powering Up
Now you are ready to turn on your system. It is a good idea to turn
on the monitor and any peripheral devices before you turn on the main
First, make sure the power cord is plugged into the power inlet on the
rear panel of the main unit. Then plug the power cable into a 3-prong,
l20-volt, grounded electrical outlet. Turn on the monitor so you can see
the messages that appear as your computer starts up. If you have a
printer or other peripheral device, turn it on next.
You can turn on your computer with or without a system diskette in
the top disk drive. For now, leave the drive empty. To turn on the computer, press the power switch on the right side of the main unit. The
power indicator on the front panel lights up and the cooling fan inside
the main unit starts. After a few seconds, the computer begins to perform
an internal self-test.
If you cannot see the screen display clearly, use the controls on your
monitor to adjust the brightness and contrast until characters on the
screen are clear and bright. If the display is not stable, check your monitor’s horizontal and vertical hold controls.
Initial setup procedure
If this is the first time your Equity III has been used, you need to use
the diagnostics diskette to perform an initial setup. This is a simple procedure which you must do at least once. You may need to do it again if you
change your system configuration-by adding a disk drive, for example-or to change the system date or time. See your diagnostics manual
for instructions.
Initial screen display
After the computer completes its self-test, a message tells you how
much RAM (random access memory) is available:
nnn KB 0K
Then the following message appears:
Non-System disk or disk error
Replace and strike any key when ready
This tells you the computer can now load an operating system from a
diskette in the top drive. The Equity III needs a disk operating system
(DOS) to function. It comes with MS-DOS version 3.1. If you want to
use another operating system, consult your dealer.
To load an operating system, insert the system diskette you want to
use (see ‘Inserting and Removing Diskettes” below). Refer to your
MS-DOS (or other operating system) manual for details on how to use
the system.
Note: Use only a backup copy of the system diskette for daily use and
keep the original in a safe place. See the operating system manual
to find out how to make a backup copy.
If your system has a hard disk, you need to prepare it before you can
run an operating system on it. Refer to ‘Using a Hard Disk Drive” in
Chapter 3 and to your MS-DOS (or other operating system) manual for
instructions on how to prepare a hard disk for use.
If your hard disk has been properly prepared and set up to automatically boot MS-DOS, the message above does not appear. Instead, the
operating system loads when you turn on the computer. The date and
time prompts display and then the system prompt:
This indicates the hard disk has been assigned as drive C.
Inserting and Removing Diskettes
To insert a diskette into a floppy disk drive, hold it with the label face
up and the write-protect notch to the left (so that the read/write slot is
away from you). Then slide it into the disk drive as shown in Figure 2-2.
Be careful not to force it into the slot. When the diskette is all the way in,
turn the latch clockwise until it locks into the vertical position. This
keeps the diskette in place while you use it and enables the read/write
heads in the disk drive to access the diskette.
Figure 2-2. Inserting a diskette
To remove the diskette, turn the latch counterclockwise until it is
horizontal and the diskette pops out. Carefully pull out the diskette,
place it in its protective envelope, and store it properly, such as in a
special diskette container.
If you have an optional 360KB floppy disk drive as well, insert the
diskette the same way as for a 1.2MB drive. When it is all the way in,
press the button labelled PUSH to lock it in place. To remove the diskette, press the PUSH button to release it and pull it out of the drive.
WARNING: Never remove a diskette or turn off the computer while the
drive indicator light is on. You could lose data. Also, be
sure to remove all diskettes before you turn off the computer.
Special Keys on the Equity III Keyboard
The dark gray keys on your keyboard serve special functions when
your computer is running application programs. Figure 2-3 shows some
of the more important keys and Table 2-1 describes them.
Figure 2-3. Special keys
Table 2-1. Special key functions
Caps Lock
Num Lock
Moves the cursor to the right in normal mode and to the left in
shift mode. Referred to as-the tab key
Works with other keys to perform special (control) functions,
such as editing operations in MS-DOS and GW-BASIC.
Produces uppercase characters or symbols when used with
the main character keys. Produces lowercase characters
when Caps Lock is on.
Works with other keys to enter alternate character codes not
otherwise available on a standard keyboard.
Changes the letter keys from lower- to uppercase; changes
back to lowercase when pressed again.
Changes the function of the numeric/cursor keys from
numeric to cursor positioning; changes back when pressed
Ends a line of keyboard input or executes a command.
Moves the cursor back one space, deleting the character to
the left. Referred to as the backspace key.
The keys that contain LED lights (Num Lock, Scroll Lock, Caps
Lock) work as toggles when you press them. When the light is on, the
function is enabled; when the light is off, the function is disabled.
Resetting the Computer
You can reset the computer to load a different operating system or to
reload the current operating system. For example, if an error occurs and
the computer does not respond to your keyboard commands, you can
reset the computer and try the same operation again. However, resetting
erases all data in the computer’s temporary memory (RAM), so reset
your computer only as a last resort.
In MS-DOS, you can hold down Ctrl and press C to stop a program’s operation and return to the MS-DOS command prompt. If an
error occurs, try this method before you reset the computer.
WARNING: Do not reset the computer to exit a program unless you
have to. Some application programs classify and store new
data whenever you exit the program properly. If you reset
the computer while such a program is running, you may
lose data.
There are three ways to reset. Because each is more powerful than
the last, try them in the order listed here:
1. If you are using MS-DOS, hold down Ctrl and Alt and press the Del
key on the numeric keypad at the right of the keyboard. The screen
goes blank for a moment and then MS-DOS reloads. (MS-DOS
must either be on the diskette or be autobootable from the hard
disk.) If this does not correct the problem, try the second method.
2. Press the RESET button on the front panel. This method works even
when the keyboard does not respond to your commands. If this does
not correct the problem, try the third method.
3. Remove any diskettes from the floppy disk drives. Turn off the monitor and any peripheral devices and then turn off the Equity III using
the power switch on the right side of the main unit. Wait 5 seconds
and then switch the power back on.
Turning Off the Computer
Before you turn off your computer, exit the program you are using
and then remove all diskettes from the disk drives. If you have a hard
disk, it is a good idea to run the MS-DOS program HDSIT to move the
disk drive’s read/write heads away from the recording area before you
turn off your computer. See your MS-DOS manual for instructions.
Turn off your monitor and peripherals first, then turn off the main
unit using the switch on the right side. The red light on the front panel
goes out.
Chapter 3
Using Disks and Disk Drives
The disk drives in your computer allow you to store data on disk,
and retrieve and use stored data when you like. All Equity III systems
have at least one floppy disk drive; you may also have a hard disk drive
and/or a second floppy disk drive in your system. This chapter explains
how disks work and tells you how to:
Choose floppy disks
Care for your disks and disk drives
Protect your data
Use a single floppy disk drive
Use a hard disk drive
How Disks Work
The floppy disks (diskettes) you insert in your system’s floppy disk
drives are round pieces of flexible plastic coated with magnetic material
and enclosed in protective jackets. Like a record, a diskette has circular
tracks on both sides. The computer stores the data you enter as magnetic
patterns on these circular tracks.
A small read/write head in the disk drive interprets the magnetic
patterns. When a diskette is in a drive, the read/write head is right over
the large oval hole in the diskette jacket. This hole allows the read/write
head to access the diskette when you store, retrieve, and delete data.
Unlike a floppy disk, a hard disk is rigid and fixed in place. It is sealed
in a protective environment free of dust and dirt, so you cannot see it. A
hard disk stores data the same way as a floppy disk, only it works faster
and has a much larger storage capacity.
Because data is stored magnetically you can retrieve it, record over it,
and erase it-just as you play, record, and erase music on cassette tapes.
Choosing Diskettes for the Equity III
When you buy diskettes, be sure to choose high-quality diskettes
with reinforced hub rings. The added reliability is well worth the extra
cost. You also need to make sure you buy the proper format type for the
drive(s) in your system.
The top floppy disk drive on the Equity III has a capacity of 1.2MB
(megabytes) and uses %&inch, high-density, soft-sectored, 96 TPI
(tracks per inch) diskettes. Each high-density diskette can hold 1.2MB of
data, or about 450 pages of text. (One megabyte equals 1,048,576 bytes.)
These diskettes are compatible with those the IBM PC AT uses, so you
can use diskettes prepared by one computer on the other.
If you have a second 1.2MB floppy disk drive, use the same highdensity diskettes described above.
If you have a second floppy disk drive that has a capacity of 360KB
(kilobytes), use W&inch, double-sided, double-density, soft-sectored, 48
TPI diskettes in this drive. Each double-density diskette can hold 360KB
of data, the equivalent of about 150 pages of text. (One kilobyte equals
1024 bytes.) These diskettes are compatible with those the IBM PC uses,
so you can use diskettes prepared by one computer on the other.
You need to format new diskettes before you can use them with an
operating system. Formatting erases all the data on a diskette and prepares it to receive new data, so be sure to format only new blank diskettes or diskettes that contain data you want to erase. Refer to your
MS-DOS (or other operating system) manual for instructions on how to
format diskettes.
Drive and diskette incompatibilities
You need to be aware of some incompatibilities between the 1.2MB
and 360KB drives and the diskettes they use. These incompatibilities
apply to diskettes from other compatible computers as well.
Although you cannot use highdensity diskettes in a 360KB drive,
you can use double-density diskettes in a 1.2MB drive under the circumstances described below.
You can use a double-density diskette in a 1.2MB drive if you format
it as a 360KB (or 320KB) diskette in the 1.2MB drive first. (Your
MS-DOS or other operating system manual explains how to format a
diskette in the density you choose.) After you do this, you can read it in
either type of drive, but write to that diskette only when it is in a 1.2MB
drive. If you write to it in a 360KB drive, it may become unusable in both
You can use a 1.2MB drive to read data from a double-density diskette that was formatted in a 360KB drive (for example, if you want to
copy files from it). But do not write to this diskette while it is in a 1.2MB
drive. If you do, the diskette may become unusable in both drives.
Here is a rule of thumb to follow: do not write to a diskette unless it
was formatted in that drive (or the same type of drive on another computer). To avoid accidentally storing data on a diskette while it is in the
wrong drive, you can place a write-protect tab on it before you insert it
in the drive (see ‘Write-protecting diskettes” below).
Because of these incompatibilities, always be sure to indicate density
and drive type when you label your diskettes.
Table 3-1 shows what types of diskettes to use in the two types of
Table 3-1. Drive/diskette compatibility
Diskette types
Diskette types
it can write to
it can read from
*Do not write to a double-density diskette in a 1.2MB drive unless it was formatted
in that drive as a 360KB (or 320KB) diskette.
Drive type
Note: Both types of drives on the Equity III can read and write to singlesided double-density diskettes. However, do not write to a singlesided diskette while it is in a 1.2MB drive unless it was formatted in
that drive as a double-density diskette.
If you have both drive types (360KB and 1.2MB), you can copy files
from one drive to another as long as the right diskette type is in each
drive. You can also copy files between a hard disk and any type of diskette. See your MS-DOS or other software manual for instructions on
how to copy files.
Caring for your Disks and Disk Drives
To avoid damaging floppy and hard disks, you need to care for them
properly. Take these precautions to avoid losing data:
Keep disks away from dust and dirt. Small particles of dust or dirt
scratch the magnetic surface and can destroy data. Dust can also ruin
the read/write heads in a disk drive.
Keep disks away from magnetic fields. (Remember that disks store
data magnetically.) There are many sources of magnetism in your
home or office, such as electrical appliances, telephones, and especially loudspeakers.
Keep disks in a moderate environment. They work best at roomtemperature and in normal humidity. Never leave diskettes sitting in
the sun, or in extreme cold or heat. The temperature in a car in the
middle of summer or in the dead of winter can cause severe damage.
Never touch a diskette’s magnetic surface. The oils on your fingertips
can damage it. Always hold a diskette by its protective jacket.
Store diskettes properly. When they are not in use, keep diskettes in
their protective envelopes and store them in a diskette container.
Do not place anything on top of your diskettes and be sure they do
not bend or sag. They do not rotate properly in the drive if damaged.
Never wipe, brush, or try to clean diskettes in any way.
Be careful when you label diskettes. Attach labels firmly but gently
and only along the top of a diskette (next to the manufacturer’s label).
Do not place several labels on top of one another-too many labels
can prevent a diskette from spinning freely in a disk drive.
It is best to write on a label before you attach it to a diskette. Use only
soft-tip pens (not ballpoint pens or pencils) to write on a label that is
already on a diskette.
Do not remove a diskette or turn off the computer while the drive
light is on. This light indicates that the computer is copying data to
or from a disk. If you interrupt this process, you can destroy data.
Remove all diskettes before you turn off the computer.
If you have a hard disk drive, take these additional precautions:
Never turn off the power to the computer when the hard disk drive
light is on. This light indicates that the computer is currently copying
data to or from the hard disk. If you interrupt this process, you can
lose data.
Never attempt to open the hard disk unit. The disk itself is enclosed
in an air-tight container to protect it from dust.
If you are going to move your computer (even to another part of the
room), run the MS-DOS program HDSIT to move the read/write
heads away from the recording area. See your MS-DOS (or other
operating system) manual for instructions.
Protecting your Data
There are two ways to avoid losing data you store on disk: you can
make backup copies and you can write-protect your diskettes.
Making backup copies
It is a good idea to make copies of all your data and system diskettes.
Copy all diskettes that contain programs, such as the master system diskettes that come with the Equity III, and use only the copies. Store your
original system diskettes in a safe place away from your working diskettes. Copy your data diskettes regularly (preferably every day) to keep
them up-to-date, and store them away from your originals.
Your MS-DOS manual describes how to make a backup copy of
your MS-DOS system diskette. To make backups of your other
MS-DOS diskettes, use the DU (Disk Utility) program or the
DISKCOPY command.
If you have a hard disk, keep backup copies of all your program files
on floppy disks, and regularly copy important data files to floppy disks
as well. For more information on backing up a hard disk, see ‘Using a
Hard Disk,” below.
Write-protecting diskettes
The right edge of a diskette has a small, rectangular notch as shown
in Figure 3-1. If you can see this notch, you can copy new data to the
diskette. If you cover the notch with an adhesive write-protect tab, you
can copy data from the diskette, but you cannot store new data on it or
delete any files it contains. If you try to change data stored on a writeprotected diskette, an error message tells you the diskette is write-protected. Write-protect tabs usually come with new diskettes when you
buy them.
Figure 3-1. Write-protect notch
Using a Single Floppy Disk Drive
Usually operating systems expect the computer to have at least two
physical disk drives and display prompts and messages accordingly. If
your system has a single floppy disk drive, MS-DOS treats your single
drive like two logical drives. This helps you perform operations that
normally require two floppy disk drives.
For example, if you give a command to copy from one drive to
another, MS-DOS copies from the first diskette you place in the drive to
the computer’s memory. Then MS-DOS prompts you to insert another
diskette and copies from memory to the diskette you place in the drive.
When copying is complete, you see a prompt to insert the original diskette.
Because you may swap diskettes this way often, it is easy to forget
which diskette is which. One way to avoid accidentally losing data is to
hold the diskette for one drive in your left hand and the diskette for the
other in your right. You can also place a write-protect tab on your source
diskette. For more information on using a single floppy disk drive with
MS-DOS, see your MS-DOS manual.
Using a Hard Disk Drive
The internal hard disk for the Equity III has a capacity of 20 megabytes-about 20 million characters. This is equivalent to approximately
60 double-density floppy disks. Using a hard disk reduces the number of
floppy disks you need and eliminates much of the disk-swapping you do
when you use floppy disks. You can do almost all of your work on the
hard disk and copy your files to floppy disks as needed (to make backups, for example).
Although the hard disk is very reliable, it is essential to back up all
your hard disk files on floppy disks in case you lose some data accidentally. Use the MS-DOS ARCHIVE program to back up your hard disk
Although it has a lot of storage space, keep only files you use regularly on the hard disk, to ensure you always have plenty of space available. Store your other files on floppy disks.
Before you can use the Epson internal hard disk, you must do the
following things to prepare it:
Use the MS-DOS SETUP program to tell your system it has a hard
Partition the hard disk to run the MS-DOS operating system using
the MS-DOS program HDPART
Format the MS-DOS partition with the MS-DOS program
HDFORMAT and include the /S option to copy the MS-DOS operating system to the hard disk.
Copy the MS-DOS utility programs to the hard disk using XTREE®
or the Copy command.
Your MS-DOS system diskette contains all of these programs. For
instructions on how to use them, refer to your MS-DOS manual.
Note: If you plan to use an operating system other than MS-DOS, you
need to use that operating system to partition the hard disk and
copy the system files to it.
The Epson hard disk is formatted at the factory. Therefore, you need
not format it before you partition it to run your operating system. If you
have serious read/write problems when you use it, you can format the
entire disk as a last resort. Follow the instructions in your Diagnostics
manual and pay attention to all the precautions before you format the
entire hard disk.
Chapter 4
Installing Option Cards
Option cards are accessories you can install in your Equity III to
provide extra capabilities. For example, you can add another disk drive,
expand the computer’s internal memory up to 15.5MB, or connect a
The Equity III has eight option card slots, so it can hold up to eight
cards. A hard disk controller card occupies one slot (whether or not your
system has a hard disk) and a card for your monitor occupies another.
You can buy option cards from Epson as well as other vendors.
Multifunction cards that allow you to add features without using multiple option card slots are also available. Consult your dealer for more
This chapter describes how to:
Remove and replace the main unit’s cover
Install and remove an option card
Set the DIP switches
Removing the Cover
To install an option card or change DIP switch settings, you need to
remove the cover from your Equity III.
WARNING: Never open the cover of the Equity III while it is plugged
into an electrical outlet. Before you open the cover, turn off
the power switches on the main unit and each peripheral,
let the computer stand for a few minutes, and then unplug
the power cable.
If the monitor is on top of the computer, move it to one side.
2. If the computer is locked, unlock it now (with the key lock). Otherwise, you cannot take the cover off your system.
As shown in Figure 4-1, the top cover is secured by four screws, two
on each side of the computer. Remove the screws on both sides of the
computer and put them all safely to one side.
Figure 4-1. Top cover screws
4. Turn the main unit around so the rear panel faces you. Hold on to the
two sides of the cover and carefully slide it straight back toward you,
away from the front of the computer, as shown in Figure 4-2. Then
lift the cover off and set it aside.
Figure 4-2. Removing the cover
Installing an Option Card
Figure 4-3 shows the eight option slots in the Equity III.
Figure 4-3. Option slots
Slots 2 and 7 are designed for 8-bit option cards and the other six-slots
1, 3 through 6 and 8-are designed for 16-bit option cards. Figure 4-4
shows both types of cards. As you can see, the X-bit card has a second
16=bit option card
8-bit option card
Figure 4-4. 16-bit and 8-bit option cards
As long as the card fits in the slot, it does not matter which slot an
option card occupies. (For example, you can place some 8-bit cards in a
16-bit slot.) However, some cards work only in a specific slot. If you
have Such a card, the instructions that come with it specify which slot
you need to use. Because the hard disk controller card must be connected
to the hard disk, this option card is in slot 8, where it is closest to the hard
disk. Leave it there.
Option cards fit in the slots only one way but be sure to examine the
card first and follow the instructions closely.
Decide which option slot you want to use and then remove the
retaining screw from the top of the metal slot cover on the rear panel.
Keep the screw to secure the option card to the computer. Lift out the
cover and keep it in a safe place in case you remove the option card
Unpack the option card and adjust any switches or jumper connections on it if necessary. (For example, a memory expansion card usually contains DIP switches that you need to set. See the option card
instructions.) When you handle the card, be careful not to touch any
of the contacts on the circuit board, especially the gold-edge connections. If you need to put it down before you install it, place it on top
of its original packing material with the component side facing
Note: Pay attention to the warnings in your option card instructions.
Most cards have delicate static-sensitive components that you
should not touch.
Keep the card’s packing materials in case you remove the card later.
Grip the card firmly by the top corners and position it at the top of
the slot. Make sure the contact pins point down and the components
face the inside of the main unit.
Slide the card straight into the slot as shown in Figure 4-5, guiding it
down the black plastic guide plate at the front end of the computer.
When the card is almost all the way in, make sure the tab at the
bottom of the metal adapter plate on the end of the card goes into the
corresponding notch at the back of the computer.
Figure 4-5. Inserting an option card
5. Once the connector pins are sitting in the connector slot, push the
card downward firmly (but carefully) to fully insert it. If the card
does not go in smoothly, do not force it-pull it all the way out and
try again, being sure to keep it straight.
6. Secure the adapter plate on the end of the card to the back of the
computer with the retaining screw.
7. If necessary, change the DIP switches inside the main unit. See “Setting the DIP Switches,” below.
Post-installation Setup
After you install an option card (and replace the main unit’s cover
and reconnect the power cord and peripherals), you need to run the
SETUP program on the diagnostics diskette to update the configuration
information. For example, if you add a hard disk, you need to run
SETUP to tell the computer that it has the additional drive. See your
diagnostics manual for instructions.
Removing an Option Card
To remove an option card, follow the same basic procedure you used
to install it. Turn off the computer, monitor, and all peripherals, and
disconnect all the cables. Then remove the main unit’s cover.
To remove the card, take out the screw holding the adapter and pull
the card straight up and out of the connector. Then carefully wrap the
card, preferably with the original packing materials, and place it inside
its box for safe storage. Cover the end of the empty option slot with the
original metal cover and retaining screw.
If necessary, reset the DIP switches inside your main unit. Also, if
you previously changed some operating system settings in the diagnostics SETUP program for the option card (to use a hard disk, for example), you need to change these settings back to their original values.
Setting the DIP Switches
If you change the configuration of your Equity III (for example, by
adding a disk drive or a monitor, or by expanding its memory), you may
need to change the DIP switch settings. Figure 4-6 shows the location of
the DIP switches inside the Equity III main unit.
There are two sets of switches; one has six switches and the other has
four. Table 4-1 shows the DIP switch functions and the descriptions below explain what each switch does. When a switch is up, it is on. When a
switch is down, it is off. To change a setting, use a hard, thin object, such
as a small screwdriver.
Figure 4-6. Location of DIP switches
Table 4-1. DIP switch functions
Switch l-l (memory size) tells your computer how much memory
(RAM space) is available. The system always checks the amount of
memory available when you reset your computer. The Equity III comes
with 640KB of RAM, so be sure this switch is on.
Switch 1-2 (monitor type) tells your system what type of monitor
you are using, color or monochrome. If you have a color monitor, turn
on switch 1-2. If you have a monochrome monitor, turn off this switch.
Switches 1-3 through 1-6 (PROM size) tell your system which type of
PROM is installed, either 27128 or 27256. These switches are set at the
factory for the correct PROM in your computer. Table 4-2 shows the
proper settings.
Table 4-2. PROM size settings
Switches 2-1 and 2-4 (built-in interface) tell your system what type of
interface (serial and parallel) you are using. You can leave both switches
on, whether or not you are using the ports.
Some option cards contain serial or parallel interface ports. To use
the port on the card, you need to turn off the appropriate DIP switch. For
example, if you install an option card with a serial interface that needs to
be used as COM1 (the device name usually assigned to the built-in serial
port), turn off DIP switch 2-1. Similarly, to disable the built-in parallel
port, turn off switch 2-4.
Switch 2-2 is not used, so leave it off.
Switch 2-3 (floppy disk drive interface) enables the floppy disk drive
interface in your system and should be on. If you install an external
floppy disk controller card at another time, you may want to turn switch
2-3 off to disable the internal floppy disk drive.
Replacing the Cover
After you install (or remove) an option card or change DIP switch
settings, follow these steps to replace the main unit’s cover:
1. Position the cover on the computer so you leave enough space to slide
it back into place.
2. Slide the cover into place so the metal tabs go underneath the top edge
of the front panel.
3. To secure the cover, replace the two screws on either side of the main
4. Turn the main unit around so the front faces you and place the monitor back on top, if that is where you keep it. Then reconnect the main
unit to the monitor, the keyboard, and any other peripherals you
5. Check to be sure the power switch on the main unit is off. Then reconnect the power cable to the back of the main unit and to an electrical
Using an Epson Mouse
You can use the Epson mouse with special software to enter data and
direct a pointer on the screen. For example, you can point to an instruction on the screen and press a button on the mouse to perform the command. Refer to the software manual that comes with the mouse, or the
application program, for instructions on how to use it.
If you need to install an option card to use the mouse, follow the
instructions in this chapter to install it. Then connect the mouse’s cable to
the connector on the card. If your mouse does not require a card, connect
the cable to the serial port on the rear panel.
To use the mouse, remove the velcro strip that covers the roller.
When you are not using it, replace the velcro strip to keep out dust and
dirt. Use the mouse only on a hard, flat surface, never on carpet-like
material or on a wet surface.
When you use the mouse frequently, clean the roller about every two
weeks. First remove the roller cover. If you have an Epson mouse, turn it
over, push the roller cover to the side, and lift the cover out. (If you have
another type of mouse, turn the cover counterclockwise to remove it.)
Then remove the roller, wipe it with a clean, dry cloth, and replace the
roller and cover. There are no other user-serviceable parts inside the
Chapter 5
You should not encounter any serious difficulties as you set up and
use your Equity III. But if anything out of the ordinary happens, refer to
this Chapter. Usually, such a situation requires nothing more than adjusting a cable connection, repeating a software procedure, or resetting the
You can use the suggestions here to solve most problems you may
encounter. If the recommended solution does not work, consult an
Epson dealer about servicing the computer.
WARNING: If you need to turn off the computer for any reason, always
wait at least 5 seconds before you turn it back on. You can
damage the Equity III if you turn it off and on rapidly.
The Computer Fails To Start Up
If the computer does not start up when you turn on the power
switch, follow these steps to find a solution:
1. Check to see if the red power LED lamp on the front panel is lit. If it is
not, remove any diskettes and then turn off the power. Wait 5 seconds, then turn the power back on.
2. If the power lamp still does not light up, turn off the power switch.
Check to see that the power cable is securely connected to both the
AC inlet on the back panel and the electrical outlet. Then turn the
power back on.
3. If the computer still does not start up, check the electrical outlet. Plug
a portable lamp into the outlet you are using for the computer and
turn it on to see if the outlet supplies power.
The Video Display Does Not Appear
If the computer starts up but no image appears on the screen, follow
these steps to solve the problem:
1. Check to see that the power indicator on the video monitor is lit. If it
is not, turn off the monitor’s power, wait 5 seconds, then turn the
power back on. Wait to see if the display screen image appears.
2. Use the controls on the monitor to turn up the brightness and contrast.
3. Remove any diskettes, then turn off the power switches on the monitor and the main unit. Check that the monitor’s power cable is
securely connected to the electrical outlet and that the monitor cable
is properly connected to both the monitor and the main unit. Turn
both power switches back on.
4. Turn off the power switches on both the main unit and the monitor.
Then check the electrical outlet for power. Plug a portable lamp into
the outlet you are using for the monitor and turn it on to see if the
outlet supplies power.
5. Follow the instructions in Chapter 4 to remove the cover from the
Equity III main unit and check DIP switch 1-2 to be sure it is set correctly for your monitor type. Be sure the computer is off and all cables
are disconnected from the main unit before you remove the cover.
The Computer Hangs Up or Freezes
If the computer locks up and does not respond to the keyboard, try
the following:
1. Wait a few seconds. Some operations take longer to perform than
others. For example, a spreadsheet program takes longer to recalculate
an entire spreadsheet than to record one figure. Also, BASIC programs that have a lot of calculations to perform can take several minutes, or even hours. Be aware of the task the computer is performing
and judge the time accordingly.
2. Check the key lock to see if it is locked. If it is, the computer does not
respond to anything you enter on the keyboard. Turn the key to the
vertical position to unlock it.
3. If the computer remains locked up, follow the steps in Chapter 2
under “Resetting the Computer.”
Floppy Disk Problems
If you have trouble with a diskette, check the following questions:
1. Is the diskette damaged? Copy the diskette and repeat the operation
that caused the problem using the copy. (If you have trouble copying
the entire diskette, some of the sectors may be bad. Try to copy single
files with the Copy command.) If the operation works using the copy,
the original diskette is probably damaged. Make another copy to use
as a backup.
2. Have you inserted the right type of diskette? The diskette type is normally shown on the manufacturer’s label. In the top drive, which has
a storage capacity of 1.2MB, use S&inch, double-sided, highdensity, 96 TPI, soft-sectored diskettes. If you have a second floppy
disk drive that is also 1.2MB, use the same type of diskettes in this
If you have a second floppy disk drive that has a storage capacity of
360KB, use double-sided, double-density, 48 TPI, soft-sectored diskettes in this drive.
The two diskette types are not interchangeable between the different
types of drives. You cannot read or write to a highdensity diskette in
a 360KB drive. You can read a double-density diskette in a 1.2MB
drive, but do not write to it unless you have formatted it in a 1.2MB
as a 360KB (or 320KB) diskette. See “Choosing Diskettes for the
Equity III” and ‘Drive and diskette incompatibility” in Chapter 3.
3. Is the diskette write-protected? There may be a write-protect tab over
the notch on the side of the diskette. Before you remove the tab, check
the directory to see what files the diskette contains-it may contain
information you do not want to change or lose. (Your operating system manual tells you what command displays a directory.) Although
you should normally write-protect all program diskettes, some programs store temporary files on the diskette. These programs do not
work if you write-protect the diskette.
Hard Disk Problems
If you have problems with your hard disk when you first start to use
it, check to see if it has been set up properly. See “Using a Hard Disk” in
Chapter 3 and refer to your MS-DOS manual.
If you cannot access data stored on your hard disk, you may have
accidentally repartitioned or reformatted part or all of the hard disk. If
you have not done so and your hard disk does not function properly,
have an authorized Epson service center check your hard disk. Never
open the air-tight container that encloses the recording disk.
Software Problems
If you have trouble with a software program, check the following list
of possible problems and solutions:
1. The software program does not start. Check that you are following
the correct procedure for your operating system. Be sure you insert
the system diskette in drive A (the top drive).
2. An application routine does not work. Refer to the software manual
and complete the routine according to the instructions. If this does
not work, reset the computer (as described in Chapter 2 under “Resetting the Computer”), reload the program, and try the routine again.
To operate properly, some programs require certain DIP switch settings. Be sure that the DIP switches inside the main unit are set for
your configuration. Chapter 4 describes how to remove the main
unit’s cover and set the DIP switches. When you turn on the computer
again, the new settings take effect.
Printer Problems
Your printer manual describes methods to solve most printer problems. If your printer does not work correctly right after you install it,
make sure the printer has power and connects to the computer properly.
The printer manual tells you how to connect your printer.
If you have a serial printer, or if you have problems with paper feeding, check the printer manual for the printer’s DIP switch settings. The
DIP switches on a printer help it communicate properly with the computer.
Option Card Problems
If you install an option card and get unexpected results, check the
following questions:
1. Is the option card installed correctly?
2. Did you follow the setup and operation procedures in the option card
3. Did you set any necessary DIP switches or jumpers on the option
card? See your option card instructions.
4. Did you set any necessary DIP switches in the main unit? See “Setting
the DIP Switches” in Chapter 4.
5. If you added an external device, did you use the proper cable to connect the peripheral to the port or option card connector on the rear
6. Did you perform any necessary post-installation setup procedures for
the operating system? See your diagnostics, MS-DOS, or other software manual for instructions.
Appendix A
Equity III Specifications
CPU and Memory
16-bit CPU
80286 microprocessor, 6 MHz clockrate
Real address @O&compatible) and protected virtual address (multi-tasking or
multi-user) modes
24-bit address and 16-bit data bus
Main memory
640KB RAM on main system board;
expandable to 15.5MB maximum with
expansion cards
Math coprocessor
80287 support (optional)
Floppy disk
Supports up to two drives available in two
formats: double-density (360KB) or highdensity (1.2MB); controller on main system board
Hard disk
Supports up to two drives available in multiple formats (including 20MB and 40MB);
installs in option slot
RS-232C, programmable, asynchronous,
DB-9P male connector
Standard 8-bit parallel, DB-25S female
Option slots
Eight IBM PC-compatible input/output
expansion slots: six with X-bit bus and
two with 8-bit bus; seven slots available in
base configuration
Interfaces (continued)
Real-time clock, calendar, and 50 byte
CMOS RAM for configuration; battery
Power Supply
Switching type, fan-cooled, 115 VAC,
200 w; +5 VDC, +l2 VDC, -5 VDC,
Mass Storage
Four drives maximum
W&inch, half-height floppy disk drive;
double-sided, high-density, 1.2MB storage
S&inch, half-height floppy disk drive;
double-sided, high-density, 1.2MB storage
W-inch, half-height floppy disk drive;
double-sided, double-density, 360KB storage capacity
S1/4-inch, half-height internal hard disk
drive; 20MB storage capacity (formatted)
with controller
S?&inch, half-height internal hard disk
drive; 40MB, storage capacity (formatted)
Detachable, two positions, 84 sculpted
%-key QWERTY main keyboard; l&key
numeric/cursor pad; 10 function keys
Function keys
Three levels (normal/shift/alternate),
Environmental Requirements
Operating range: 41° to 104°F
(5° to 35°C)
Storage range: 22° to 158°F
(-20° to 60°C)
operating range: 20% to 80%,
Storage range: 20% to 90%,
Physical Characteristics (CPU only)
Width, inches (mm)
21.26 (540)
Depth, inches (mm)
16.93 (430)
Height, inches (mm)
6.95 (167.5)
Weight, pounds (kg)
33.22 (15.1) Single floppy disk drive
36.96 (16.8) Single floppy disk drive and
one 20MB hard disk
Power Requirements
115 VAC ± 20%, 60 Hz, 5 amps
Monochrome video
Supports Epson- or IBM PC-compatible
monochrome monitor; 80-character x 25line display; 9 x 14 character block; installs
in option slot
TTL monochrome
monitor (12-inch
High-persistence, green, P-39 phosphor
screen; etched surface to reduce glare; 22
MHz video bandwidth; 35 W
video card
Supports Epson- or IBM PC-compatible
RGB color or composite video monitors;
40-character x Z-line display (low-resolution text); 80-character x 25-line display
(high-resolution text); 640 x 200 (high-resolution graphics); 8 x 8 character block; installs in option slot
Options (continued)
RGB color
monitor (13-inch
High-contrast screen; 16 colors; etched
surface to reduce glare; 18 MHz video
diagonal) bandwidth
Epson mouse/
interface card
Two-button mouse with option card;
installs in option slot
American Standard Code for Information Interchange. A standardized coding system for representing characters, such as numbers, letters, and graphic symbols. An ASCII character occupies one byte of
storage. Files transmitted in ASCII code can be used by many
different computers, printers, and programs.
A method of data transmission in which one machine sends data one
character at a time to another, without either machine preparing for
the transmission.
An extra copy of a program, data file, or disk, kept in case your
working copy is damaged or lost.
A binary digit (0 or 1). The smallest unit of computer storage. The
value of a bit represents the presence (1) or absence (0) of an electric
To load a program or an operating system.
A sequence or group of eight bits that represents one character.
Anything that can print in a single space on the page or the screen.
Includes numbers, letters, punctuation marks, and graphic symbols.
Complementary Metal-Oxide Semiconductor. A method for making
silicon chips.
A system of symbols for representing data or instructions. Also any
software program or part of a program.
An instruction you enter on the keyboard to direct your computer to
perform a specific function.
The particular setup of a group of components. For example, a CPU
with two floppy disk drives, connected to a monochrome monitor
and a printer is a typical system configuration.
Control code
A command (generated when you hold down Ctrl and press another
key on the keyboard) that instructs your computer to perform a specific function.
Central Processing Unit. The piece of hardware which interprets
instructions, performs the tasks you indicate, keeps track of stored
data, and controls all input and output operations.
The highlighted marker which shows your position on the screen
and moves as you enter and delete data.
Information stored or processed by a computer.
Data diskette
A formatted diskette used to store files.
DIP switches
Small switches on a piece of hardware such as a CPU, a printer, or an
option card. DIP switch settings control various functions and provide a system with information about itself. DIP stands for Dual InLine Package.
A list of the files stored on a disk or a part of a disk.
The collective term for both hard disks and floppy disks (diskettes).
Disk drive
The physical device which allows the computer to read from and
write to a disk. A floppy disk drive has a disk slot on the front panel
of the main unit into which you insert diskettes. A hard disk is permanently fixed inside the main unit, hidden behind the front panel.
A flat piece of flexible plastic coated with magnetic material and used
to store data permanently. Also called floppy disk.
The Disk Operating System that controls the computer’s input and
output functions. See Operating system.
A type of diskette format that allows you to store twice as much data
as the standarddensity format. A double-density diskette for the
Equity III has a storage capacity of 360KB.
A group of related pieces of information called records, or entries,
stored together on disk. Text files consist of words and sentences.
Program files consist of code and are used by computers to interpret
and carry out instructions.
Floppy disk
See Diskette.
To prepare a new disk (or erase an old one) so that it can receive
information. Formatting a disk divides it into tracks and sectors and
creates addressable locations on it.
Microsoft’s extended version of the Beginner’s All-purpose Symbolic
Instruction Code. A programming language designed to be easy to
use and understand.
Hard disk
The enclosed unit used to store data permanently. Unlike a floppy
disk, it is fixed in place. It can process data more rapidly and store
many more files than a floppy disk.
Any physical component of a computer system, such as a monitor,
printer, keyboard, or CPU.
A type of diskette format that allows you to store up to 1.2MB of
Input/output port
see Port.
A physical or software connection used to transmit data between
equipment or programs.
Kilobyte (KB)
A unit used to measure storage space (in a computer’s memory or on
a disk). One kilobyte equals 1024 bytes.
Light Emitting Diode. A substance that illuminates when electricity
passes through it, like the indicator lights on the front panel of the
Equity III.
Main unit
The Equity III computer.
Megabyte (MB)
A unit used to measure storage space (in a computer’s memory or on
a disk). One megabyte equals 1,048,576 bytes.
The area where your computer stores data. Memory contents can be
-permanent and inalterable (ROM) or temporary (RAM).
A small version of a CPU contained on one semiconductor chip.
A device which allows a computer to transmit signals over telephone
lines so it can send and receive data. Modem stands for MOdulator/
The piece of hardware that contains the screen and displays information.
Monochrome monitor
A monitor that displays in only one color, such as green or amber, as
opposed to a color monitor which can display in several colors.
A device used (as an alternative to a keyboard) to control a pointer
on the screen and operate a program.
An operating system from Microsoft. See DOS, Operating system.
Operating system
A collection of programs that allow a computer to control its operations. The operating system determines how programs run on the
computer and supervises all input and output-for example,
Option card
A card you install inside the Equity III main unit to provide additional capabilities, such as more memory, a hard disk drive, or a
The type of interface which transmits data in groups of bits. See
Interface, Serial.
To divide a hard disk drive into separate sections for use by different
operating systems.
A device (such as a printer or a modem) connected to a computer
that depends on the computer for its operation.
A physical input/output socket on a computer where you can connect a peripheral.
A disk file that contains coded instructions and tells a computer what
to do and how to do it.
Programmable Read-Only Memory. A PROM is a ROM that can be
Random Accesss Memory. The part of memory that a computer can
both read and write to. The programs you use are temporarily stored
in RAM. All data stored in RAM is erased when you turn off the
To copy data from one area to another. For example, when you open
a text file stored on disk, the computer reads the data from the disk
and displays it on the screen.
Read/write head
The physical device inside a disk drive that reads and records data on
the magnetic surface of a disk.
To reload a computer’s operating system so that you can retry a task
or begin using a different operating system. Resetting clears RAM.
Red Green Blue. An RGB monitor displays in high-resolution color.
Read Only Memory. A portion of memory that can only be read and
cannot be used for temporary storage. ROM retains its contents even
when you turn off the power.
A widely-used, standard type of serial interface. You can easily connect RS-232C-compatible devices to the Equity III.
A contiguous section of a disk track that provides an address at
which the computer can access data.
The initial diagnostics procedures a system performs to check its
The type of interface which transmits data one bit at a time. See
Interface and Parallel.
The programs that enable your computer to perform the tasks and
functions you indicate.
System diskette
A diskette that contains the operating system.
Addressable concentric circles on a diskette, resembling the grooves
on a record, which help to divide the diskette into separate accessable areas. There are 40 tracks on each side of a double-sided,
double-density diskette and 80 tracks on each side of a double-sided,
high-density diskette.
To store data on a disk.
To prevent a diskette from being overwritten by placing a write-protect tab over the notch on the side of the diskette. When a diskette is
write-protected, you cannot erase, change, or record over its contents.
Access slots, option card 9
AC inlet 8-9, 45
AC outlet 8, 11
Adjusting keyboard legs 12-13
Alt 22-23
Application program 15, 18
Arranging components 5
ASCII codes 15, E1
Asynchronous A-1, B-1
AT, IBM 1, 14
Auto-boot MS-DOS 20
Auxiliary power outlet 4, 8, 11
Backup 20, 29, 47, B-1
Backup copies 20, 29, 31
Backspace key 22
Bit B-l
Booting MS-DOS 19-20, B-1
Brightness control, monitor 19, 46
Built-in interface l, 13, 41
Button, PUSH 21
Button, RESET 7, 23
Byte B-1
keyboard 3, 12
monitor 10
parallel 14
power 15, 45
printer 14
serial 15
Caps Lock 22-23
floppy disk controller 40-41
hard disk controller 9, 33, 36
option 9
registration 3
video 1, 3, 9-11, 33, A-3
Caring for disks and disk drives 28-29
Centronics-compatible connector 13
Character B-1
Character set, Equity III 15
Choosing diskettes 25
Choosing location 4
Clock/calendar/RAM interface A-2
Clockrate A-1
CMOS A-2, E1
Code B-1
Color/graphics video card 1, 3
Color monitor 1, 3, A-3, A-4
Command B-1
Compatibility, diskette 26-27, 47
arranging 5
front panel 6-7
rear panel 8-9
moving 3, 7, 29
resetting 23, 48
Configuration 1, 16, 19, 39, B-1
keyboard 12-13
power cord 9
printer 13-15
video monitor 10-11
monitor 10
option card 35
printer 13-15, A-1
slot 38
Contrast control, monitor 19, 46
Control code
Ctrl Alt Del 23
Ctrt C23
floppy disk 40-41, A-1
hard disk 9, 33, 36, A-1
Coprocessor, math 1, 17, A-1
Copy command 31
disks 29-30, 47
files 27
operating systems 31
Cord, power 3, 8-9, 19
Cover, main unit
removing 33-34, 46
replacing 42
CPU A-1, B-1
Ctrl 22-23
Ctrl Alt Del 23
Ctrl C 23
Cursor B-1
Data B-1
Data diskette B-1
Data diskette, copying 29, 47
Data, protecting 29-30
DB-9P 15, A-1
DB-25S 13
D connector 11, 14
Del 23
Diagnostics diskette 3, 19, 39
DIP switches
definition B-1
floppy disk drives 40-41
functions 39-41
location of 39-40
memory size 40-41
monitor type 40-41
parallel interface 40-41
RAM 40-41
serial interface 40-41
setting 16, 39-41, 46, 48-49
Directory B-2
Disabling keyboard 18
Disabling parallel port 41
Disconnecting keyboard 13
Disk B-2 Also see Diskette, Hard disk
Disk drive 1
caringfor 28-29
compatibility 26-27, 47
definition B-2
floppy 1, 6, 20-21, 25-31, A-2
hard 1, 6, 25, 29, A-2
inserting diskettes into 20-21
LED lamp 6
optional 21
problems 47
protector sheet 7
single floppy 30-31
slot 20
attaching labels to 28
backing up 20, 29, 47
care and handling 28-29
choosing type for disk drives 26
compatibility 26-27, 47
copying 29-30, 47
definition B-3
diagnostics 3, 19, 39
doubledensity 26-27, 47
double-sided 26-27, 47
format 26-27
high-density 26-27, 47
incompatibilities 26-27, 47
inserting 20-21
labeling 27-28
problems 47
reading 26-27, 47
removing 21
single-sided 27
storing 28
system 7, 19-20, 29, 31, 48
types 26-27, 47
write-protecting 47
writingto 27, 47
Disk lock/release
button 20
latch 6, 20-21
Disk operating system 20, B-3
Display, monitor See Monitor
DOS 20, B-3
Double-density diskettes 26-27, 47, B-3
Double-sided diskettes 26-27, 47
Drive See Disk drive
Drive/diskette compatibility 26-27, 47
DU 29
Electromagnetic interference 4
Enter 22
Environmental conditions 4, A-3
External devices 1
File B-3
Files, copying 27
Floppy disk See Diskette
Floppy disk controller A-1
Floppy disk drive See Disk drive
Floppy disk problems 4-7
floppy disk types 26-27, B-3
hard disk 32, 48, B-3
Front panel 6-7
Graphic characters, printing 15
Graphics video card 3
Grounded outlet 4
Hard disk
backing up 47
care of 29
controller A-1
controller card 9, 33, 36
definition B-3
drivel, 6, 25, A-2
formatting 32, 48
LED lamp 6, 29
partitioning 31, 48
preparing for use 20, 31-32
problems 48
using 31
Hardware B-3
HDSIT 24, 29
Head, read/write 7, 20, 24-25, 28
High-density diskettes 26-27, 47, B-3
IBM PC AT 1, 14
Initial screen display 19
Initial setup procedure 19
Inlet, AC 8-9, 45
Input/output port 7, A-l, B-4
Inserting diskette 20-21
Installing option card 33-42, 49
Installing video card 10
card 41
clock/calendar/RAM A-2
definition B-4
disk drive 40-41
option slots A-l
parallel 1, 8, 13-14, 40-41, A-1
printer 8, 13-15, A-1
serial, 8, 13, 15, 40-41, A-1
speaker, A-2
Internal self-test 19
angle, adjusting 12-13
cable 3, 8, 12
connecting 12-13
disabling 18
disconnecting 13
function keys 22, A-2
layout 22
legs 12-13
locking 7
socket 8, 12
special keys 22
specifications A-2
Key Lock 7, 18, 33, 46
Keys 18
Kilobyte (KB) B-4
Labeling diskettes 27-28
Latch, disk drive 6
LED lamp
definition B-4
disk drive 6
keys 23
power 7, 19, 45
Legs, keyboard 12-13
Load an operating system 20, 23
Location, choosing 4
Location of DIP switches 39
Locking main unit, keyboard 7, 17, 33, 46
Magnetic fields 28
Magnetic surface of disk 25, 28
Main memory 1, 23, 33, 40-41
Making backup copies 29, 31, 47
Main unit
cover, removing 33-34, 46
cover, replacing 42
definition B-4
front panel 6-7
models 1
power switch 19
rear panel 7-9
Mass storage A-2
Math coprocessor 1, 17, A-1
Megabyte (MB) B-4
Memory 1, 23, 33, 40-41, A-1, B-4
Memory expansion card, 1, 9, 23
Microprocessor A-1, B-4
Models, Equity III 1
Modem 8, B-4
brightness 19
cable 10
color, RGB 1, A-3 A-4
connecting l0-11
contrast 19, 46
controller card 33
controls 19
definition B-4
DIP switch 40-41
display 19, 46
Epson 3
monochrome 1, 3
power 4-6
type 40-41
monitor 1, 3, B-4
video card 1, 3, A-3
Mouse 1, 42, B-4
Mouse interfacecard 1, 9, 42, A-4
Moving computer 3, 7, 29
Moving read/write heads 7, 20, 24-25, 28-29
booting 19-20, 23
definition B-5
operating system 3, 19
preparing hard disk 31
system diskette 3, 31
Multifunction card 33
Multi-tasking 2, A-1
Multi-user 2, A-1
Num Lock 22-23
Operating system
copying 31
definition B-5
diskette 7
loading 20, 23
Optional disk drive slot 6
Option card
access slots 9, 33, 35
adapter plate 37
connector(s) 35
connector slot 38
definition B-5
installing 33-42, 49
post-installation setup 39, 49
problems 49
retaining screw 37
removing 39
slot 9, 35-36
slot cover 37
Options, Equity III 1, A-3
Option slot interface A-1
AC 8, 11
auxiliary power 4, 8, 11
grounded 4
front 6-7
rear 7-9
cable 14
definition B-5
interface 1, 8, 13-15, 40-41, A-1
port 8, 41
printer 8, 13-15
Partitioning hard disk 31, 48, B-5
PC AT IBM 1, 14
Peripheral B-5
Physical characteristics, Equity III A-3
Plotter 1, 8, 13
Plugging in power cord 8
Port(s) 7, 8, 15, B-5
Post-installation setup, option card 39, 49
auxiliary outlet 4, 8
consumption 11
cord 3, 8-9, 19
inlet 8-9, 45
LED lamp 7, 19, 45
requirements A-3
source 4
supply A-2
switch 19
turning off 24-25
turning on 17, 19-20
Power cord, connecting 9
Powering up 19-20
Preparing hard disk 20, 31-32
Printer 1
cable 14-15
Connecting 13-15
connector 13-15, A-1
interface 8, 13-15, A-1
parallel 8, 13-15
placement 14
port 8
problems 48
serial 8, 13, 15, 48
socket 14
Printing graphic characters 15
Program B-5
PROM 40-41, B-5
Protecting data 29-30
Protector sheet, disk drive 7, 17
PUSH button, 360KB floppy disk drive 21
RAM 19, 23, 40-41, A-1, B-5
Random access memory 19, 23, 40-41, A-1, B-5
RCA connector 11
Read B-6
Reading disk 26-27, 47
Read-only memory (ROM) A-1, B-6
Read/write heads 7, 20, 24-25, 28-29, B-6
Rear panel 7-9
Registration card 3
Removing cover 33-34
Removing disk drive protector sheet 7
Removing diskette 21
Removing option card 39
Replacing cover 42
RESET button 7, 23
Resetting the computer 23, 48, B-6
Retaining screw, option card 37
RGB color monitor 3, A-3 A-4, B-5
ROM A-1, B-6
RS-232C serial port 8, 15, A-1, B-6
Safety rules 17
Screen display 19, 46
Screws, removing 33-34
Scroll Lock 23
Sectors 47, B-6
Self-test, internal 19, B-6
cable 15
definition B-6
device 15
interface 1, 8, 13, 15, 40-41, A-1
printer 8, 13, 15, 48
RS-232C port 8, 15
Setting DIP switches 16, 39-41, 48-49
Setting up system 3
SETUP 31, 39
Setup, post-installation 39, 49
Setup procedure, initial 19
Shift 22
Side screws, main unit 33-34
Single floppy disk drive, using 30-31
Single-sided diskettes 27
Slots, option 9, 35-36
definition B-6
problems 48
programs 48
Speaker interface A-2
Special character set 15
Special keys 22
Specifications, Equity III, A-1 A-4
Squeeze locks, printer 14-15
Storing diskettes 28
Switches,setting 16, 39-41, 46, 48-49
Switch, power 19
arrangement 5
configuration 1, 16, 19
diskette 3, 19-20, 29, 31, 48, B-6
locking 18
moving 3
prompt 20
setting up 3
Tab key 22
Top cover screws 33-34
Tracks 25, B-7
Troubleshooting 45-49
TTL monochrome monitor A-3
off Equity III 24, 45
on Equity III 17, 19-20
on monitor 19
on peripherals 19
Unlocking computer 33, 46
Unpacking Equity III 3
Using disks and disk drives 25
Using Equity III 17
Using hard disk drive 31
Using single disk drive 30-31
Ventilation 4
Video card, installing 10
Video display 19, 46
Video interface card 1, 3, 9-11, 33, A-3
Video monitor See Monitor
Write-protecting diskettes 29-30, 47, B-7
Write-protect notch 29, 47
Write-protect tab 27, 29-31, 47
Writing on diskette labels 27-28
Writing to disk 27, 47, B-7