Commodore Plus/4 User manual

User's Manual
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USER'S "This equipment generates and uses radio frequency energy. If it is
MANUAL not Pr°Per|y installed and used in strict accordance with the manu-
STATEMENT facturer's instructions, this equipment may interfere \\ Ih ■ idio and
television reception. This machine has been tested and found to com
ply with the limits for a Class B computing device in accordance with
the specifications in Subpart J of Part 15 of the FCC Rules, which are
designed to provide reasonable protection against such interference
in a residential installation. If you suspect interference, you can test
this equipment by turning it off and on. If you determine that there
is interference with radio or television reception, try one or more of
the following measures to correct it;
• reorient the receiving antenna
• move the computer away from the receiver
• change the relative positions of the computer equipment and
the receiver
• plug the computer into a different outlet so that the computer
and the receiver are on different branch circuits
If necessary, consult your Commodore dealer or an experienced radio/
television technician for additional suggestions. You may also wish to
consult the following booklet, which was prepared by the Federal
Communications Commission:
"How to Identify and Resolve Radio-TV Interference Problems."
This booklet is available from the U.S. Government Printing Office,
Washington, D.C. 20402. Stock No. 004-000-00345-4;
You should use only the cables, accessories, and peripherals re
commended by Commodore for your Plus/4. All cables, including the
cables for the television hookup, serial port, video port, Datassette™
and joysticks, are specially shielded, in accordance with the regula
tions of the Federal Communications Commission. Failure to use
the appropriate accessories and cables will invalidate the FCC grant
of certification, and may cause harmful radio interference.
Copyright © 1984 by Commodore Electronics Limited
All rights reserved.
This manual contains copyrighted and proprietary information. No pan ol 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 Commodore Electronics Limited
Commodore BASIC v 3 5
Copynghi ■£■ 1984 by Commodore Electronics Limited,all rights reserved.
Copyright © 1977 by Microsoft, all rights reserved.

COMMODORE PLUS/4
USER MANUAL
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TABLE OF INTRODUCTION 1 _
CONTENTS CHAPTER 1 Unpacking and Setting Up 7
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CHAPTER 2 Using the Keyboard and Screen 22
CHAPTER 3 Using Software 33 —
CHAPTER 4 Getting Started 42
CHAPTER 5 Beginning BASIC 58
CHAPTER 6 Numbers and Calculations 68 —'
CHAPTER 7 Using Graphics and Color 83 _
CHAPTER 8 Making Sound and Music 104
COMMODORE PLUS/4 ENCYCLOPEDIA n?
1 BASIC 3.5 Encyclopedia 115
Commands 1 u—
Statements 130
Functions 15b—
Variables and Operators 16^
2 BASIC 3.5 Abbreviations 169
3 Conversion Programs U%~^
4 Error Messages 17^
5 TEDMON 184
6 Screen Display Codes 193—
7 ASCII and CHRS Codes 196
8 Screen and Color Memory Maps 199
9 Memory Register Map 201—'
10 Deriving Mathematical Functions 203
11 Musical Note Table 204
12 Programs To Try 206 '

13 RS-232 Guidelines 209
14 Book List 215
INDEX 216
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INTRODUCTION
H
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You've made a wise purchase... the Plus/4 is the first home computer
ever designed especially for productivity applications. Of course, it's
still able to do all the other things a home computer can be used for.
This manual is designed to help you learn those "other things" your
Plus/4 can do. You'll learn how to:
• Set up your Plus/4
• Use the different functions of all the keys on the keyboard
• Access different types of Commodore Software
• Use the mathematical, graphics, sound and programming
capabilities of your Plus/4
The other manual included with your computer (T/ie Plus/4 Built-in
Integrated Software Manual) tells you how to use the wordprocessing.
electronic spreadsheet, database and graphics packages. If your
main interest is in these productivity applications, and you can't wait to
get started using them, we still recommend that you read through at
least chapter one of this manual ("Unpacking and Setting Up") before
reviewing the Built-in Software Manual.
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WHAT'S
SPECIAL
ABOUT
THE
PLUS/4
64K RAM (60K available for BASIC programming)
Full Typewriter Style Keyboard
Optional Built-in Software
Screen Window Capability
HELP Key
8 Pre-programmed, Reprogrammable Function Keys
Four Separate Cursor Keys
Uses Most COMMODORE 64 and VIC-20 Peripherals
121 Colors (16 primary colors, 8 luminance levels)
Over 75 BASIC Commands
High Resolution Graphics Plotting
Split-Screen Text With High-Res Graphics
Graphic Character Set On Keyboard
Keyboard Color Controls
320 x 200 Pixel Screen Resolution
Reverse and Flashing Characters
2 Tone Sound Generators
Built-in Machine Language Monitor (17 commands)
CREATING
A COMPLETE
COMPUTER
SYSTEM
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Computer: Commodore PLUS/4

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Display; Commodore 1702 or 1802/1803 Color Monitor
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Storage: Commodore 1531 Datasselte (tape recorder) or Commodore
Disk Drive
Printer: Commodore Printer