Radio Shack TRS-80 Model 100 Guida utente

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MODEL

100

BASIC

LANGUAGE

LAB

•II

UMITID

WARRANTY

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Model

100

BASIC

Language Lab

ADIVISION

TANDY CORPORATION

FORT WORTH, TEXAS 78102

Model 100 BASIC Language Lab Program:

Model

100

BASIC Language Lab Program Manual:

Reproduction

use, without express written permission from

Tandy Corporation,

any portion of this manual

prohibited.

While reasonable efforts have been taken in the preparation

this

manual

assure its accuracy, Tandy Corporation assumes

liability resulting from any errors or omissions

this manual, or

from the use

the information contained herein.

109

8 7 6 5 4 3 2 1

Contents

Introduction. .......................................................... 1

Lesson

Introduction to

BASIC.

....................................... 3

Lesson

Saving Programs. ..........................................

Lesson

Interest Calculations

......................................

Lesson

Sales Commissions .........................................

Lesson

Day, Time and Date ........................................

Lesson

Using the Editor.

Lesson

Sales Trend .............................................

.. ..

Lesson

Plot Your Data

Lesson

Functions

111

Lesson # 10 Data Files ' ,

123

Lesson #

Average Sales

131

Lesson

#12

Sound &Simulation

145

Lesson #

Function Keys

155

Lesson

#14

Using the COM Option

165

Lesson

#15

TELCOM Applications

175

Application # 1 Calculator

185

Application

Memory Master Game

189

Application

Descriptive Statistics

195

Index

203

Introduction

you've used your TRS-80 Model 100 just once, you know how simple, versatile,

and powerful acomputer it is. Its built-in application programs allow you

perform

normally complex computer operations with ease. This includes data manipulation,

computer-to-computer communications, word processing, and more.

However,

you become more familiar with your Model 100, you can make the

computer even more useful by customizing it to suit your own special needs. This

done through BASIC, the built-in programming language.

For instance, from BASIC, you can:

•Re-define the Function Keys

(fj)

through

(lID.

•Communicate with information services and other computers.

•Write programs for awide range

applications such

forecasting sales trends and

performing interest or mortgage calculations.

•Make use

the computer's graphic and sound capabilities.

and ahost

other operations!

This course will show you how

perform operations such

these by explaining in

detail the BASIC section

your Model 100 Owner's Manual. This means that by the

time you've finished this course. you'll be writing your own programs and using the

built-in application programs more effectively.

Since most

the application programs not built-in will be written

BASIC, and

since BASIC interacts with the other built-in programs, you'll find it

definitely to

your advantage

become familiar with BASIC.

So sit back and get ready to enjoy your Model 100 even more. You're about to find

out how powerful acomputer it really

is!

it'

Lesson

Introduction

BASIC

To use the BASIC capabilities of the Model 100, you must first learn how to

communicate with your Computer. Essentially, this involves typing instructions on the

keyboard and watching the display for responses from the Computer.

While you can type anything you wish on the keyboard, the Model 100 only responds

to words written in its own "language." This "language"

BASIC.

you type

something which the Model

100

does not recognize

aBASIC word, it will respond

with an error message.

In this lesson, you will learn afew BASIC commands

communicate with your

Computer and write simple programs.

It should be mentioned at this point, that even when you type aBASIC word, the

Model 100 will not respond until the ENTER key (located in the right side of the

keyboard)

pressed. After pressing

(ENTER),

the line just typed is placed in memory

for processing by the Computer.

Throughout this Manual, the phrase "enter this command" will be used often. This

simply means that you should press

after typing the command or instruction.

Also, when

tell you

press

you should press both

(SHIFT)

and

(PAUSE)

together.

Accessing BASIC

Prior

typing or editing aBASIC program, you must access the BASIC interpreter

the Model 100.

When you Power-Up the Computer, you will see the Main Menu, which shows all the

''files'' that exist in the Model 100's memory. Think

these computer files simply

file folders that may hold text or programs.

you haven't created any files, the Main Menu displays the built-in application

programs:

11:06:08

(C)Microsoft

TEL

COM

ADDRSS

20897

Bytes

free

On initial Power-Up, the Main Menu Cursor -the large, dark rectangle -is

positioned over the word

"BASIC."

The Cursor can be placed on any other Menu

word by pressing the Cursor Movement Keys

«(3

,G ,rn ,or rn).

To access the BASIC interpreter, simply position the Cursor over the word BASIC

and press

CEmR.l.

The Display will then look like this:

TRS-8~

Model

100

Software

(cpr.

1983

Microsoft

21190

Bytes

free

The number 2

indicates the number of free bytes for creating any programs and

it may vary depending upon the capacity

your machine and whether any other files

have been created and saved.

The word 0 kand the flashing cursor symbol below it, indicate that you are in the

Command Mode

BASIC and ready to begin programming.

Experiment

Entering aCommand

Acommand

an instruction to the Computer ordering it to

something

immediately. In this experiment you will learn how to enter asimple command.

First you will attempt to have the Model 100 print out aname on the display. Type

the name:

JOHN

SMITH

You may use any other name. Now, press

As soon as you do this, the

Computer displays the message:

?8N

Error

This message indicates that an error, specifically asyntax error, has been made. The

syntax error occurred because the Computer doesn't recognize John Smith

part

its vocabulary (also known

the Instruction Set).

The correct way to instruct the Computer to print the name

to type:

JOHN

(ENTER)

sure to press

at the end

the line. The key word PRINT and the

quotation marks enclosing the name are recognized as part

the Computer's

vocabulary. This way no syntax error occurs and the name appears printed right below

the command.

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