Radio Shack TRS-80 Model 3 Manuale utente
TRS·BO™
Model
III
•
peratlon
and
ASI
Langua
e
Refer
nee
nu
I
Itadle
Ihaek
®
MA
DIVISION
OF
TANDY
CORPORATION
FORT WORTH, TEXAS 76102
TRS·80
Model
HI
Operation
and
BASIC
Language Reference Manual: ©1980 Tandy
Corporation,
Fort
Worth,
Texas 76102 U.S.A.
All
Rights Reserved.
Reproduction
or
use, without express written
permission from Tandy
Corporation.
of
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
System
Software:
©1980
Tandy
Corporation
and
Microsoft.
All
Rights
Reserved.
The
system
software
in
the
Model
III
microcomputer
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 copyrighted and are the proprietary and trade
secret information
of
Tandy Corporation and
Microsoft. Use. reproduction or publication
of
any
portion
of
this material without the prior written
authorization
by
Tandy Corporation
is
strictly
prohibited.
10
9 8 7 6 5 4 3 2
To OurCustomers. •
The
TRS-80@ Model III
COITlputer
is avery powerful tool for business, home and
recreation. Twenty years ago, this capability would have costhundreds
of
times as
much as yourModel III cost, and wouldhave taken up an entire room.
In spite
of
its
power
and internal complexity, the Model III canbe quite simple to
operate. In fact, you candetermine
just
how'
'technical" amachine you want it to
be.
At
the simplestlevel
of
operation, you can use RadioShack prepared cassette
programs. All
you
will needto know is how to load and run acassette program, and
howto operate the cassette recorder.
If
this is where you wantto start, read
Chapters 1through 6
of
the Operation Section. You may also want to read about
CLOAD and SYSTEM
in
Chapter2
of
the Language Section.
If
you wantto writeyourown programs and you are abeginner, read Chapters 1
through6
of
the OperationSection, then startreadingthe book, Getting Started
with TRS-80 BASIC. That, plus severalotherRadio Shackbooks, canguideyou to
becomingaprogrammerin BASIC and Z-80 language (' 'machine code'').
If
you already know BASIC, and especially
if
youhaveexperience on aTRS-80
Model I, read the entireOperation Section
of
this manual, as well as the Appendix
whichcompares the Model Iand Model III. The Model III has many unique
features andsome very importantdifferences. Afew minutes spentbefore you
press
(ENTER)
couldsave you hours later.
About Manual
This manual contains operating instructions (Section
1)
and adescription
of
Model
III BASIC (Section 2and Appendix).
It
is arranged
for
easy reference, whether you
are seeking simple
or
technical information. Page numbering starts overat the
beginning
of
eachchapter, and chapternumbering starts overat the beginning
of
eachsection. There is acomprehensive Index at the end
of
this book.
If
you are abeginner,
don't
worry aboutthe technical parts in the Operation
Section.
The
beginning
of
eachchapteris for you. (When you getto the POKE
statements, youcan skip ahead to the next chapter
...
)You
don't
needto read past
Chapter6.
Then,
when you learn simple BASIC programming, you can return and
try
out
all
the'
'goodies" packedintoyourModel III.
TRS-SO
MODEL III
C
nt
nts
Operation Section
ABrief Description
of
the Computer 1/1-3
Installation 2/1-3
Operation 3/1-9
Power-On DRESET Switch DPower-Off DStart-Up Dialog
DModes of Operation DSample Session
Using the Keyboard 4/1-3
Capitals and Lowercase DSpecial Keys DControl Codes
Using the Video Display 5/1-5
Character Size Cursor DScroll Protection DText D
Graphics DSpace Compression DSpecial Characters
Using the Cassette Interface 6/1-6
Cassette TransferSpeed DLoading Errors DSaving aBASIC
Program on Tape DLoading aBASIC Program from Tape D
How to Search for aProgram DLoading aSYSTEM Tape D
Searching for aProgram
Using aLine Printer 7/1-6
Line Printer vs Video Display Output 0Printer Control
Features DPrint Screen Function
Using the
RS
..
232
..
CInterface 8/1-8
What
is
an
Interface? DUsing the Model
III
as aTerminal 0
Programming the RS-232-C
Routing Input/Output 9/1-3
To Route from One Device to Another DRouting Multiple
Devices
Real
..
Time Clock. ...................................
..
10/1-3
To Set the Clock 0To Read the Clock DTo Display the Clock
Input/Output Initialization
11/1-1
Technical Information .............................
..
12/1-26
To Protect High
RAM
DROM Subroutines Memory Map
oSummary of Important ROM Addresses Summary of
Important RAM Addresses
Troubleshooting and Maintenance 13/1-3
Symptom/Cure Table DAC Power Sources 0Maintenance
Specifications. . . . . .. . .. . . . .. . .. . . .... . . .. .. . .. .. . ..
..
14/1-3
Power Supply DMicroprocessor 0RS-232-C Interface
DParallel (Printer) Interface Cassette Interface
ii
BASIC Language Section
BASIC Concepts 1/1-30
Commands 2/1-7
Input-Output Statements 3/1-13
Program Statements 4/1-15
Strings '5/1-9
Arrays 6/1-6
Arithmetic Functions 7/1-5
Special Features 8/1-10
Editing 9/1-7
Appendices
Model III Summary A/1-18
Special Charactersand Abbreviations 0Commands 0State-
ments0Functions Reserved Words 0Program Limits
MemoryUse0Accuracy 0
Error Codes B/1-3
TRS-SO
Model III Character Codes C/1-9
Keyboard/DisplayCharacters Graphics0Special Charac-
ters 0Video DisplayWorksheet0
Internal Codes
for
BASIC Keywords 0/1-2
Derived Functions E/1-2
Base Conversions F/1-4
Model I
to
Model III Program Conversion Hints G/1-2
Glossary H/1-3
RS-232-C Technical Information
1/1-4
Index
ForWarrantyand CustomerInformation,seethebackcoverand
insidebackcover.
iii
Questo manuale è adatto per i seguenti modelli
1
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