Radio Shack TRS-80 User manual

®
Model IH
Disk System Owner's Manual
Mini-Disk Operation
TRSDOS™ Disk Operating System
Disk BASIC Programming Language
Radio /hack
The biggest name in little computers ™
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CUSTOM MANUFACTURED IN THE USA BY RADIO SHACK HADIVISION OF TANDY CORPORATION

The FCC Wants You to Know . .
.
This equipment generates and uses radio frequency energy. If not installed and used prop-
erly, that is, in strict accordance with the manufacturer's instructions, it may cause interfer-
ence to radio and television reception.
It has been type tested and found to comply with the limits for a Class Bcomputing
device in accordance with the specifications in Subpart Jof Part 15 of FCC Rules, which are
designed to provide reasonable protection against such interference in aresidential instal-
lation. However, there is no guarantee that interference will not occur in aparticular
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 adifferent outlet so that computer and receiver are on different
branch circuits.
If necessary, you should consult the dealer or an experienced radio/television technician for
additional suggestions. You may find the following booklet prepared by the Federal Com-
munications Commission helpful: How to Identify and Resolve Radio-TV Interference
Problems.
This booklet is available from the US Government Printing Office, Washington, DC
20402, Stock No. 004-000-00345-4.
Warning
This equipment has been certified to comply with the limits for aClass Bcomputing device,
pursuant to Subpart Jof Part 15 of FCC Rules. Only peripherals (computer input/output
devices, terminals, printers, etc.) certified to comply with the Class Blimits may be attached
to this computer. Operation with non-certified peripherals is likely to result in interference to
radio and TV reception.

CHANGE OF ADDRESS
NOTE:If you move, please fill out this card and return it so that you may continue to
receive information regarding this program.
13070181
Version/Date
7R-0312
Purchase Date
NEW ADDRESS:
Name
Company
Address _
City
State Zip
Cat No.
OLD ADDRESS
Name
Company
Address _
City
State Zip
CHANGE OF ADDRESS
NOTE:If you move, please fill out this card and return it so that you may continue to
receive information regarding this program.
Purchase Date I30701S7
Version/Date
cat no. 26 -0312
NEW ADDRESS: OLD ADDRESS:
Name Name
Company Company
Address Address
City City
State Zip State 7jn
INSTRUCTIONS FOR USE
1
.
Register one software package per card only.
2. Complete the Software Registration portion of this form and mail it immediately.
The Catalog No. may be found by examining the upper-right corner of your diskette.
3. For convenience achange of address card has been included. Copy all information
from the Registration Card onto it prior to sending the Registration Card.

Computer Merchandising
P.O. Box 2910
Fort Worth, Texas 761 13-291
Attn :Software Registration
Computer Merchandising
P.O. Box 2910
Fort Worth, Texas 761 13-291
Attn: Software Registration
PLACE
STAMP
HERE
PLACE
STAMP
HERE

Model III Users
XFERSYS UTILITY ON TRSDOS 1.3
The Model III diskette in this package contains aNEW
version of TRSDOS which is not compatible with OLD versions
of TRSDOS.
OLD TRSDOS diskettes to be used under the NEW TRSDOS MUST
be XFERSYSed before use. Once XFERSYSed, an OLD TRSDOS
diskette becomes aNEW TRSDOS diskette and should not be
used with OLD TRSDOS again. If you started with an OLD
system or data diskette, the XFERSYSed diskette will be a
NEW system or data diskette respectively.
OLD diskettes used under NEW TRSDOS without XFERSYSing, may
cause extraneous information to be read at the end of
files, giving afalse End-of-File (EOF) indication. Some
programs will not function properly under these conditions.
NEW diskettes used under OLD TRSDOS, may not access all
data and/or NEW programs may not run correctly.
If you need to use the XFERSYS utility, see the TRSDOS
section of your TRS-80 Model III Disk System Owner's
Manual.
Note: When changing from one TRSDOS to the other, you MUST
press the RESET button each time the diskette in
Drive is changed. You may also XFERSYS onto aNEW
data disk. If this is done, all system files of the
system diskette will be moved onto the data diskette.
RADIO SHACK APPLICATION PROGRAMS WHICH WERE DELIVERED ON AN
OLD TRSDOS DISKETTE SHOULD NOT BE XFERSYSed.
OLD: TRSDOS 1.1 and 1.2.
NEW: TRSDOS 1.3
file: Acollection of information stored as one
named unit in the directory.
program: Afile which causes the computer to
perform afunction.
data: Information contained in afile which is
used by aprogram.
system diskette: Adiskette containing TRSDOS. When this
diskette is placed in Drive and the
RESET button is pressed, TRSDOS will begin
to run.
data diskette: Adiskette which does not contain TRSDOS.
If this diskette is placed in Drive and
RESET is pressed, the screen will clear
and "Not aSYSTEM Disk" will be displayed.
XFERSYS: Aprogram contained on the TRSDOS 1.3
diskette.
8759117-681

Tips On Loading Disk basic
There are several ways, other than those described in the manual, to start up Disk basic.
basic program -F.files -m: address
program is atrsdos file specification for aDisk basic program. After start-up, Disk basic will run the
program. This is optional.
-f: files tells Disk basic the maximum number of files that may be open at one time, files is a
number from to 15. This is optional; if omitted, 3is used. If Variable length files are
needed, you must include the suffix vafter files; otherwise, files will be Fixed length.
-w.address tells Disk basic not to use memory above the specified address. This is optional; if
omitted, Disk basic uses all memory up to Top.
If all options are omitted, Disk basic will prompt with HON MANY FILES? and MEMORY?
The options allow you to specify any or all of the following:
•Aprogram to run after Disk basic is started.
•The maximum number of data files that may be Open at one time. The larger the number of files,
the less area available for storing and executing your programs. (Note: Each Fixed length file takes
up 360 bytes and each Variable length file takes up 616 bytes of memory.)
•The highest address to be used by Disk basic during program execution. Omit this unless you are
going to call machine-language subroutines.
Examples ,fs
Under trsdos ready, if you type:
BASIC fENTERj,Disk basic will enter the command mode once you answer the files and
memory prompts.
BASIC -F:1(INTER]. Disk basic will Open one fixed length file and protect no memory.
BASIC -M :32000 CENTER), Disk basic will Open three fixed length files and will use
memory no higher than 32000.
BASIC PAYROLL -F:3M .
OTTER), Disk basic will start-up, then load and run the basic
program called payroll; three variable length files can be Opened, and basic can use all
available memory.
Note: If you PATCH Disk basic to prompt you for cassette speed when you enter Disk basic, you
will still be prompted with CASS' no matter which option you use.
Important Note for Model III trsdos 1.3 Users!
The 1.3 version of trsdos will return with ERROR 31 (PROGRAM NOT FOUND) when you
attempt to use the ROUTE command.
Thank-You!
Radio /hack
IADivision of Tandy Corporation -
8759109

Model III
Manual
Radio /hack®
]H ADIVISION OF TANDY CORPORATION
FORT WORTH, TEXAS 76102

TRS-80* Model III Disk System Owner's Man-
ual: ©1980 Tandy Corporation, Fort Worth,
Texas 76102 U.S.A. All Mights Reserved.
Reproduction or use, without express written per-
mission from Tandy Corporation or any portion of
this manual is prohibited. While reasonable
efforts have been taken in the preparation of this
manual to assure its accuracy, Tandy Corporation
assumes no liability resulting from any errors or
omissions in this manual or from the use of the
information obtained herein.
Model III TMSDOS™ Operating System: ©1980
Tandy Corporation, Fort Worth, Texas 76102
U.S.A. All Rights Reserved.
Model III BASIC Software: ©1980 Tandy Cor-
poration and Microsoft. All Rights Reserved.
The system software in the Model III microcom-
puter is retained in aread-only memory (ROM)
format. All portions of this system software,
whether in the ROM format or other source code
form format, and the ROM circuitry are copy-
righted and are the proprietary and trade secret
information of Tandy Corporation and Microsoft.
Use, reproductions, or publication of any portion
of this material without the prior written authori-
zation by Tandy Corporation is strictly prohibited.
10 9876543

OWNER'J
To Our Customers
Congratulations on your purchase of the Model III Disk System. We think it's a
valuable tool which will save you work as well as give you hours of enjoyment
(or maybe both at once). You'll have all the power of the non-disk Model III,
plus the following features:
•Your Computer can now be controlled by trsdos™ ,the powerful trs-80 Disk
Operating System, trsdos is included on adiskette with the Disk System.
•Using trsdos, you can run awide variety of programs, such as the Disk basic
interpreter included on the trsdos diskette.
aEach "system" diskette has approximately 126,720 bytes of storage available
for your own programs and data; each "data" diskette has 178,944 bytes
available.
8You can load and save data at the approximate rate of 250,000 bits per second.
•Your system can continue to grow in power and convenience. When Radio
Shack issues improvements and enhancements to the system programs, you
can "install" them simply by obtaining anew release of the trsdos diskette.
Model III Manuals
Publications related to the use of the Model III Disk System:
1
.
Model III Disk System Owner's Manual (this manual). We'll call it the "Disk
Manual" for short.
2. Model 111 Disk System Quick Reference Card.
3. Model III Operation and basic Language Reference Manual, the "Model III
Manual" for short.
4. Model HI basic Quick Reference Card.
For Disk Operation:
This Disk Manual supplements the Model III Manual. Use the Disk Manual as
the primary source of information; we'll tell you when to refer to the non-disk
Model III Manual
.
For Non-Disk Operation:
To use the Computer as anon-disk system, all you need is the Model III
Manual.
For Programming Information:
The Model III Manual contains most of the programming information, except
that which pertains to disk input/output. In this manual, we will assume that you
ri

1
LJ— TRS-80 MODEL 111 DISK SYSTEM
are familiar with the basic programming definitions and details given in the
Model III Manual.
About This Manual
The Model III Disk System is intended for use by novices as well as
experienced computer operators and programmers. In designing and writing this
Disk Manual, we've tried to define and satisfy the needs of both groups:
-Novices who might prefer asequential presentation which emphasizes
procedures and explains the purpose of various features.
•Experienced users who might prefer amore analytical presentation which
makes it easy to find specific information.
In this manual, you'll find information that should satisfy your needs, whichever
group you might belong to.
The "Sample Sessions" are especially geared for novices, while the Technical
Information chapters are for the more experienced users.
Keep in mind, however, that it isn't necessary to read the entire manual to
operate the Disk System, if you are only interested in Disk basic, for example,
read the Operation section of this book and then turn directly to the Disk basic
section. You can then go back to the trsdos section when you need to.
Special Terms
Even in the non-technical sections of this manual, we've had to use numerous
special terms. Rather than scattering and repeating definitions throughout the
book, we have used the following convention which we hope you'll find
helpful.
Special terms which are fully defined in another part of the manual are printed in
boldface. Look up the word or phrase in the Index; this will tell you where the
word is fully defined.