VIC-20_Programmers_Notebook.pdf

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22089

VIC20

Programmer's

Notebook

Earl R. Savage

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CONTINUING EDUCATION SERIES'"

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IJWiJL.

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edtted by Ttrus. Ttrus

Larsen

The Blacksburg Continuing Education'M Series

The Blacksburg

Continuing

Education

SeriesT"

of books provide a

laboratory-or experiment-

oriented approach

to electronic topics. Present

and

forthcoming titles

this series include:

• Advanced 6502 Interfacing

•

Analog

Instrumentation

Fundamentals

•

Apple II Assembly language

Apple

Interfacing

Basic Business Software

Basic Robotics

Concepts

BASIC Programmer's Notebook

Circuit Design

Programs

for the Apple II

Circuit Design Programs for the TRS-80

Computer Assisted Home Energy Management

Design of Active Filters, With Experiments

Design of Op·Amp Circuits, With Experiments

Design of Phose-locked loop Circuits, With

Expe riments

Design of VMOS Circuits, With Experiments

8080/8085 Software Design

Volumes)

8085A

Cookbook

Electronic Music

Circuits

Fiber Optics Communications, Experiments,

and

Projects

555 Timer Applications

Sourcebook,

With

Experiments

FORTH Programming

Guide to CMOS Basics, Circuits,

Experiments

How to Program and Interface the 6800

Introduction to Electronic Speech Synthesis

Introduction to FORTH

•

Computer Communication Techniques

•

Microcomputer-Analog Converter Software and

Hardwa

Interfacing

•

Microcomputer

Data-Base

Management

•

Microcomputer Design and Maintenance

•

Microcomputer Interfacing With the 8255 PPI Chip

NCR Basic Electronics Course, With Experiments

NCR EDP Concepts Course

PET

Interfacing

Programming and

Interfacing

the 6502, With

Experim

ents

16·Bit Microprocessors

• Real Time Control With the TRS-80

•

6502 Software Design

• 6801, 68701, and 6803 Microcomputer Programming and Interfacing

• The 68000: Principles and Programming

•

6809 Microcomputer

Programming

Interfacing, With Experiments

• STD Bus Interfacing

• TEA

An 8080/8085 Co-Resident Editor/ Assembler

• TRS-80 Assembly language Mode Simple

• TRS-80 Color Computer

Interfacing,

With Experiments

• TRS-80 Interfacing

Volumes)

• TRS-80 More Than BASIC

•

Word processing for Small Businesses

In most cases, these books provide both text

material and

experiments, which permit

one

demonstrate and explore the concepts that are covered

the book. These books remain among

the

very

few that provide

step~by-step

instructions concerning how to learn basic electronic con-

cepts, wire actual circuits, test microcomputer interfaces,

and

program

computers

based

popu-

lar microprocessor chips. We have found that the books

are

very useful to the electronic

novice

who desires to

join

the

"electro

nics

revolution," with

minimum

time

and

effort.

Jonathan A. Titus, Christopher A. Titus,

and

David G. Larsen

"The

Blacksburg Group"

Bug symbol

tr~demark

The

Blacksburg Group, Inc., Blacksburg,

24060

[

VIC20

[

·[

PROGRAMMER'S

NOTEBOOK

Earl R. Savage

[

(

Howard W. Sams

Co., Inc.

4300 WEST 62ND

ST. INDIANAPOLIS, INDIANA 46268 USA

,1[

[

FIRST EDITION

FIRST PRINTING- 1983

reproduced, stored in a retrieval system, or

transmitted by any means, electronic, mechanical,

photocopyin g, recording, or otherwise, without

written permission from the publisher. No patent

liability is assumed with respect to the use of the

information contained herein. While every pre-

caution has been taken in the preparation of this

book, the publisher assumes no responsibility for

errors or omissions. Neither is any liability assumed

for damages resulting from the use of the

information contained herein.

Internationa l Standard Book Number: 0-672-22089-X

Library of Congress Catalog Card Number: 83-50494

Edited by:

Welborn Associates

Illustrated by:

David K. Cripe

Printed in the United States of America.

[

[

Preface

This Notebook is dedicated to the proposition that program

writing on the VIC-20 can be both easier and better. That state-

ment includes every type of program-game, tutorial, financial,

mathematicaf, and record keeping - in short, whatever you set

your VIC 20 to do.

All of us begin our programming with efforts that are both

simple and crude. Enough effort and debugging made them do

the job in spite of their crudeness. No one starts out with flawless

programming. In fact, it is extremely doubtful that anyone ever

achieves perfection because there is just too much to learn,

especially considering the continuous improvements made in

both hardware and software. So, this Notebook is designed for

you, the VIC 20 programmer-user, whether you are a beginner or

an old hand.

If you are getting started, you can achieve better program-

ming results by using the techniques and subroutines in this book

because here you will find shortcuts and "tricks of the pro-

grammer's trade." There are subroutines and other statement

sequences that are designed to "dress up" your programs and

make them more professional in appearance. Also, there are

techniques for increasing their effectiveness and efficiency. You

will find instructions and explanations for making your VIC 20 do

things that have not yet occurred to you. Best of all, any of these

Notes can be copied directly into your programs because they are

written specifically for the VIC 20.

Be advised that there are few programs in this book. There are

many subroutines and program fragments that you can use;

however, the programs will have to be yours. These Notes will

help you do the job- they won't do it for you. There is no sub-

stitute for your imagination and sense of purpose.

[

VIC-20_Programmers_Notebook.pdf

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