(It commodore
COMPUTER
==-
FIRST EDITION
THIRD PRINTING-1983
Copyright @ 1982 by Commodore Business Machines, Inc.
All rights reserved.
This manual is copyrighted and contains proprietary information. No part of this publica-
tion may be reproduced, stored in a retrieval system, or transmitted in any form or by any
means, eledronic, mechanical, photocopying, recording, or otherwise, without the prior
written permission of COMMODORE BUSINESS MACHINES, Inc.
ii
TABLE OF CONTENTS
INTRODUCTION. . ... . . .. . . ... . ... . . ... . . .. . . .. . . .. . .. .. ix
. What's Included? . .. . . .. . .. . . .. .. . .. . . .. . . ... . ... . . .. x
. How to Use This Reference Guide...................." xi
. Commodore 64 ApplicationsGuide. . .. . . .. . .. . . ... . . ... xii
. Commodore Information Network. . . . . . . . . . . . . . . . . . . . . .. xvii
1. BASIC PROGRAMMING RULES 1
. Introduction 2
. ScreenDisplay Codes (BASIC Character Set) ............. 2
The Operating System(OS) 2
. Programming Numbers and Variables 4
Integer, Floating-Point and String Constants.. . . . . . . . . . 4
Integer, Floating-Point and String Variables. . . . . . . . . . . 7
Integer, Floating-Point and String Arrays 8
. Expressionsand Operators... . . .. . . ... . . .. . . .. . .. . . .. . 9
Arithmetic Expressions.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Arithmetic Operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Relational Operators 12
Logical Operators .. ... . ... . . .. . . .. . .. .. . . .. . .. . . .. ~3
Hierarchy of Operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Stri ng Operations 16
String Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 17
. Programming Techniques 18
Data Conversions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Using the INPUT Statement 18
Using the GETStatement. . . . . . . . . . . . . . . . . . . . . . . . . .. 22
How to Crunch BASIC Programs 24
2. BASIC LANGUAGE VOCABULARY... . . .. . . . .. . . .. .. 29
. Introduction 30
. BASIC Keywords,Abbreviations, and Function Types 31
. Description of BASIC Keywords (Alphabetical) 35
. The Commodore 64 Keyboard and Features 93
. Screen Editor.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 94
iii
3. PROGRAMMING GRAPHICS ON THE
COMMODORE64 ... 99
· Graphics Overview 100
Character Display Modes
.. ... ... .. .. . .. ... ... ... ... 100
Bit Map Modes 100
Sprites 100
· GraphicsLocations 101
VideoBankSelection... ... . .. ... ..... ... .. ... ... .. 101
Screen Memory 102
ColorMemory .1.. . ... . . .. . . .. 103
Character Memory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 103
. Standard CharacterMode. .. . . . .. . . . . . . . . . . . . . . .. . . .. 107
Character Definitions 107
· Programmable Characters 108
. Multi-Color Mode Graphics 115
Multi-Color Mode Bit 115
. Extended Background Color Mode 120
. BitMappedGraphics... .... .... ... ..... ..... .'" .... 121
Standard High-Resolution Bit Map Mode. . ... . ... . 122
HowItWorks. . . .. .. ... ... .... .... ..... .... . .. 122
. Multi-ColorBitMap Mode. ... . .. . . . . . . . .. . .. . . .. . . ... 127
. SmoothScrolling 128
. Sprites 131
Defining a Sprite 131
Sprite Poi nters
. . . ... . . . .. . . . ... . .. .. . . . .. . . . ... . .. 133
Turning Sprites On 134
Turning Sprites Off
. . . . . . . . . .. . . . .. . . . . . . . . . . . . . . .. 135
Colors.. . . .. . . . .. .. . . . .. . . .. . . . . . . . . . . . . . . . .. . . .. 135
Multi-Color Mode 135
Setting a Sprite to Multi-ColorMode. . . . . . .. . . ... . ... 136
Expanded Sprites 136
Sprite Positioning 137
Sprite PositioningSummary.. . . . . . . . . . . . . . . . . . . .. . .. 143
SpriteDisplayPriorities.... .. ... .. . .. ... .. ... . . .... 144
Collision Detects 144
. Other Graphics Features 150
Screen Blanking 150
Raster Reg ister
..... ... ... .. ... ..... ... ... .. ... .. .. 150
Interrupt Status Register. . . . . . . . . . . . . . . . . . . . . . . . . . .. 151
Suggested Screen and Character Color Combinations... 152
iv
. Programming Sprites-Another Look 153
Making Sprites in BASIC-A Short Program. ... . .. . . .. 153
Crunching Your Sprite Programs 156
Positioning Sprites on the Screen 157
Sprite Priorities .. ..... . . .... . . ... . . ... . . . .. . . . .. .. 161
Drawing a Sprite 162
Creating a Sprite
. . . Step by Step 163
Moving YourSprite on the Screen. . .. . . .. . . .. . ... . . .. 165
VerticalScrolling... .. . . . . . . . . . . . . . . .. . . . .. . . . . . . .. 166
The Dancing Mouse-A Sprite Program Example. . . . . .. 166
EasySpritemakingChart.. . ... . ... .. .. . ... . . ... 176
SpritemakingNotes.. . .. . . .. . ... .. .. . ... . . .. . ... . .. 177
4. PROGRAMMING SOUND AND MUSIC
ON YOUR COMMODORE 64 183
. Introduction 184
Volume Control 186
Frequencies of Sound Waves. . . ..... ..... ..... ...... 186
. UsingMultipleVoices... . .. . . ... . ... .. ... . .. . 187
Controlling Multiple Voices 191
. Changing Waveforms . ... . . ... . . . ... . . ... . . ... . . . .. .. 192
UnderstandingWaveforms..... .... . . ... .... 194
. TheEnvelopeGenerator. . . . . .. . . . .. . . . . . .. . . .. . . . . . .. 196
. Filtering 199
. Advanced Techniques. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 202
. Synchronization and Ring Modulation 207
5. BASICTOMACHINELANGUAGE 209
. What is Machine Language? ... ... ..... .... ..... ... ... 210
What Does Machine Code Look Like? . . . ... . . ... . . . ... 211
Simple Memory Map of the Commodore 64 ...... .. .... 212
The Registers Inside the 6510 Microprocessor 213
. How Do You Write Machine Language Programs? 214
64MON 215
. HexadecimalNotation.. ... ... .... ..... .... .... .. 215
Your First Machine Language Instruction 218
Writing Your First Program 220
. Addressing Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 221
Zero Page 221
The Stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 222
v
. Indexing 223
Indirect Indexed 223
Indexed Indirect 224
Branches and Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 226
. Subroutines 228
. Useful Tips for the Beginner 229
. Approaching a Large Task. . . . . . . . . . . . . . . . . . . . . . . . . . .. 230
. MCS6510 Microprocessor Instruction Set-
Alphabetic Sequence "'.. . . . . . . . . . . . . . . . . . . . . . . .. 232
Instruction Addressing Modes and
Related Execution Times. . . . . . . . . . . . . . . . . . . . . . . . .. 254
. Memory Management on the Commodore 64 .. ..... ...... 260
. The KERNAL.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 268
. KERNALPower-Up Activities. . . . . . . . . . . . . . . . . . . . . . . . . .. 269
Howto Use the KERNAL.. . . . . . . . . . . . . . . . . . . . . . . . . .. 270
User Callable KERNALRoutines 272
Error Codes 306
. Using Machine Language From BASIC 307
Where to Put Machine Language Routines.. . . . . . . . . . .. 309
How to Enter Machine Language 309
. Commodore 64 MemoryMap ... ..... . ... .. 310
Commodore 64 Input/Output Assignments. . . . . . . . . . . . .. 320
6. INPUT/OUTPUT GUIDE... . . . . . . . . . . . . . . . . . . . . . . . . . .. 335
. Introduction 336
. Output to the TV .... ..... ...... ..... ..... ...... .. ... 336
. Output to Other Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 337
Output to Printer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 338
Output to Modem 339
WorkingWithCassetteTape. . . . . .. . . . ... . . ... . . .... 340
Data Storage on Floppy Diskettes. . . . . . . . . . . . . . . . . . .. 342
. The Game Ports .. . . . . . . . . . . . . . . .. . . . .. . . . .. . . . . .. . .. 343
Paddles 346
Light Pen 348
. RS-232 Interface Description 348
General Outline 348
Opening an RS-232 Channel 349
Getting Data From an RS-232 Channel 352
Sending Data to an RS-232 Channel 353
Closing an RS-232 Data Channel 354
Sample BASIC Programs. . . . . . . . . . . . . . . . . . . . . . . . . . .. 356
vi
Receiver/Transmitter Buffer Base Location Pointers 357
Zero-Page Memory Locations and Usage
for RS-232SystemInterface. . . . . . . . . . . . . . . . . . . . . .. 358
Nonzero-Page Memory Locations and Usage
for RS-232System Interface.. . . . . . . . . . . . . . . . . . . . .. 358
. The User Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 359
Port Pin Description 359
. The Serial Bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 362
Serial Bus Pinouts
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 363
. The Expansion Port . . . . . . . . . . . .. . . . .. . . . . . . . . . . . . . . .. 366
. Z-80MicroprocessorCartridge. . . . . . . .. . . . .. . . . . . . . . . .. 368
Using Commodore CP/M@
. .... .. . .. ... ... .. ... ... ... 369
Running Commodore CP/M@ . .. .. . . . ... . .. .. . .. ... . .. 369
APPENDICES
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 373
A. Abbreviations for BASICKeywords.. . . . . . . . . . . . . . . . . .. 374
B. Screen Display Codes 376
C. ASCIIand CHR$Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . .. 379
D. Screen and Color MemoryMaps. . . . . . . . . . . . . . . . . . . . .. 382
E. Music Note Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 384
F. Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 388
G. VIC Chip Register Map 391
H. Deriving Mathematical Functions 394
I. Pinouts for Input/Output Devices. . . . . . . . . . . . . . . . . . . . .. 395
J. Converting Standard BASIC Programs to
Commodore 64 BASIC 398
K. Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 400
L. 6510 Microprocessol Chip Specifications 402
M. 6526 Complex Interface Adapter (CIA)
Chip Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 419
N. 6566/6567 (VIC-II)Chip Specifications. . . . . . . . . . . . . . . .. 436
O. 6581 Sound Interface Device (SID) Chip Specifications. .. 457
P. Glossary 482
INDEX 483
COMMODORE 64 QUICK REFERENCECARD 487
SCHEMATIC DIAGRAM OF THE COMMODORE 64 .. . .. 491
vii
INTRODUCTION
The COMMODORE64 PROGRAMMER'SREFERENCEGUIDE has been
developed as a working tool and reference source for those of you who
want to maximize your use of the built-in capabilities of your
COMMO-
DORE64. Thismanual contains the information you need for your pro-
grams, from the simplest example all the way to the most complex. The
PROGRAMMER'SREFERENCEGUIDE is designed so that everyone from
the beginning BASIC programmer to the professional experienced in
6502 machine language can get information to develop his or her own
creative programs. At the same time this book shows you how clever
your COMMODORE 64
really is.
This REFERENCEGUIDE
is not designed to teach the BASICpro-
gramming language or the 6502 machine language. There is, however,
an extensive glossary of terms and a "semi-tutorial" approach to many
of the sections in the book. If you don't already have a working knowl-
edge of BASIC and how to use it to program, we suggest that you study
the COMMODORE64 USER'SGUIDE
that came with your computer. The
USER'SGUIDE
gives you an easy to read introduction to the BASICpro-
gramming language. If you still have difficulty understanding how to use
BASIC then turn to the back of this book (or Appendix N in the USER'S
GUIDE) and check out the Bibliography.
The COMMODORE 64 PROGRAMMER'SREFERENCEGUIDE is just
that; a reference. Like most reference books, your ability to apply the
information creatively really depends on how much knowledge you have
about the subject. In other words if you are a novice programmer you
will not be able to use all the facts and figures in this book until you
expand your current programming knowledge.
ix
What you can do with this book is to find a considerable amount of
valuable programming reference information written in easy to read,
plain English with the programmer's jargon explained. On the other
hand the programming professional will find all the information needed
to use the capabilities of the COMMODORE64 effectively.
WHAT'S INCLUDED?
. Our complete "BASIC dictionary" includes Commodore BASIC lan-
guage commands, statements and functions listed in alphabetical
order. We've created a "quick list" which contains all the words
and their abbreviations. This is followed by a section containing a
more detailed definition of each word along with sample BASIC
programs to illustrate how they work.
. If you need an introduction to using machine language with BASIC
programs our layman's overview will get you started.
. A powerful feature of all Commodore computers is called the KER-
NAL. It helps insure that the programs you write today can also be
used on your Commodore computer of tomorrow.
. The Input/Output Programming section gives you the opportunity to
use your computer to the limit. It describes how to hook-up and use
everything from lightpens and joysticks to disk drives, printers, and
telecommunication devices called modems.
. You can explore the world of SPRITES,programmable characters,
and high resolution graphics for the most detailed and advanced
animated pictures in the microcomputer industry.
. You can also enter the world of music synthesis and create your
own songs and sound effects with the best built-in synthesizer
available in any personal computer.
. If you're an experienced programmer, the soft load language sec-
tion gives you information about the COMMODORE64's ability to
run CP/M* and high level languages. This is in addition to BASIC.
Think of your COMMODORE64 PROGRAMMER'SREFERENCEGUIDE
as a useful tool to help you and you will enjoy the hours of programming
ahead of you.
.CP/M is a registered trademark of Digital Research, Inc.
x INTRODUCTION
HOW TO USE THIS REFERENCEGUIDE
Throughout this manual certain conventional notations are used to de-
scribe the syntax (programming sentence structure) of BASIC commands
or statements and to show both the required and optional parts of each
BASIC keyword. The rules to use for interpreting statement syntax are as
follows:
1. BASIC keywords are shown in capital letters. They must appear
where shown in the statement, entered and spelled exactly as shown.
2. Items shown within quotation marks (" ") indicate variable data
which you must put in. Both the quotation marks and the data
inside the quotes must appear where shown in each statement.
3. Items inside the square brackets ([ ]) indicate an optional state-
ment parameter. A parameter is a limitation or additional qualifier
for your statements. If you use an optional parameter you must
supply the data for that optional parameter. In addition, ellipses
( . . . ) show that an optional item can be repeated as many times
as a programming line allows.
4. If an item in the square brackets ([ ]) is UNDERLINED,that means
that you MUST use those certain characters in the optional pa-
rameters, and they also have to be spelled exactly as shown.
5. Items inside angle brackets «» indicate variable data which you
provide. While the slash ( / ) indicates that you must make a choice
between two mutually exclusive options.
EXAMPLE OF SYNTAX FORMAT:
OPEN<file-num> ,<device> [,<address>], ["<drive>: <file-
name>] [,<mode>]"
EXAMPLES OF ACTUAL STATEMENTS:
10 OPEN 2,8,6,"0:STOCK FOLlO,S,W"
20 OPEN 1,1,2,"CHECKBOOK"
30 OPEN 3,4
When you actually apply the syntax conventions in a practical situa-
tion, the sequence of parameters in your statements might not be
exactly the same as the sequence shown in syntax examples. The
examples are not meant to show every possible sequence. They are
intended to present all required and optional parameters.
INTRODUCTION xi
Programming examples in this book are shown with blanks separating
words and operators for the sake of readability. Normally though,
BASIC doesn't require blanks between words unless leaving them out
would give you an ambiguous or incorrect syntax.
Shown below are some examples and descriptions of the symbols
used for various statement parameters in the following chapters. The list
is not meant to show every possibility, but to give you a better under-
standing as to how syntax examples are presented.
DESCRIPTION
A logical file number
A hardware device number
A serial bus secondary
device address
number
A physical disk drive number
The name of a data or program file
Literal data supplied by
the programmer
Any BASIC data variable name or
constant
Use of a string type variable required
Use of a numeric type variable
required
An actual program line number
An integer or floating-point variable
COMMODORE 64 APPLICATIONS GUIDE
When you first thought about buying a computer you probably asked
yourself, "Now that I can afford to buy a computer, what can I do with
it once I get one?"
The great thing about your COMMODORE64 is that you can make it
do what YOU want it to do! Youcan make it calculate and keep track of
home and business budget needs. You can use it for word processing.
You can make it play arcade-style action games. You can make it sing.
Youcan even create your own animated cartoons, and more. The best
part of owning a COMMODORE64 is that even if it did onlyone of the
things listed below it would be well worth the price you paid for it. But
the 64 is a complete computer and it does do EVERYTHINGlisted and
then some!
xii INTRODUCTION
SYMBOL EXAMPLE
<file-num> 50
<device> 4
<address>
15
<drive> 0
<file-name>
"TEST. DATA"
<constant> "ABCDEFG"
<variable>
X145
<string>
AB$
<number>
12345
<line-number> 1000
<numeric>
1.5E4
By the way, in addition to everything here you can pick up a lot of
other creative and practical ideas by signing up with a local Commo-
dore Users' Club, subscribing to the COMMODOREand POWER/PLAY
magazines, and joining the COMMODOREINFORMATIONNETWORKon
CompuServe™ .
APPLICATION
ACTION PACKED
GAMES
ADVERTISING &
MERCHANDISING
ANIMATION
BABYSITTING
BASIC PROGRAMMING
BUSINESS
SPREADSHEET
COMMUNICATION
COMMENTS/REQUIREMENTS
You can get real Bally Midway arcade games
like Omega Race, Gorf and Wizard of Wor, as
well as "play and learn" games like Math
Teacher I, Home Babysitter and Commodore
Artist.
Hook your COMMODORE64 to a TV, put it in
a store window with a flashing, animated,
and musical message and you've got a great
point of purchase store display.
Commodore's Sprite Graphics allow you to
create real cartoons with 8 different levels so
that shapes can move in front of or behind
each other.
The COMMODORE 64 HOME BABYSITTER
cartridge can keep your youngest child occu-
pied for hours and teach alphabet/ keyboard
recognition at the same time. It also teaches
special learning concepts and relationships.
Your COMMODORE64
USER'SGUIDE and the
TEACH YOURSELF PROGRAMMING series of
books and tapes offer an excellent starting
point.
The COMMODORE 64 offers the "Easy" series
of business aids including the most powerful
word processor and largest spreadsheet
available for any personal computer.
Enter the fascinating world of computer "net-
working." If you hook a VICMODEM to your
COMMODORE 64 you can communicate with
other computer owners all around the world.
INTRODUCTION xiii
COMPOSING SONGS
CP/M*
DEXTERITY TRAINING
EDUCATION
FOREIGN LANGUAGE
GRAPHICS AND ART
Not only that, if you join the COMMODORE
INFORMATIONNETWORKon CompuServe™
you can get the latest news and updates on
all Commodore products, financial informa-
tion, shop at home services, you can even
play games with the friends you make through
the information systems you join.
The COMMODORE 64 is equipped with the
most sophisticated built-in music synthesizer
available on any computer. It has three com-
pletely programmable voices, nine full music
octaves, and four controllable waveforms.
look for Commodore Music Cartridges and
Commodore Music books to help you create or
reproduce all kinds of music and sound effects.
Commodore offers a CP/M* add-on and ac-
cess to software through an easy-to-Ioad car-
tridge.
Hand/Eye coordination and manual dexterity
are aided by several Commodore games . . .
including "Jupiter lander" and night driving
simulation.
While working with a computer is an educa-
tion in itself, The COMMODORE Educational
Resource Book contains general information
on the educational uses of computers. We
also have a variety of learning cartridges de-
signed to teach everything from music to math
and art to astronomy.
The COMMODORE 64 programmable char-
acter set lets you replace the standard char-
acter set with user defined foreign language
characters.
In addition to the Sprite Graphics mentioned
above, the COMMODORE 64 offers high-
resolution, multi-color graphics plotting, pro-
xiv INTRODUCTION
.CP/M is a Registered trademark of Digital Research, Inc.
INSTRUMENT
CONTROl
JOURNALS AND
CREATIVE WRITING
LlGHTPEN CONTROL
MACHINE CODE
PROGRAMMING
PAYROLL & FORMS
PRINTOUT
PRINTING
RECIPES
grammable characters, and combinations of
all the different graphics and character dis-
play modes.
Your COMMODORE 64 has a serial port,
RS-232 port and a user port for use with a
variety of special industrial applications. An
IEEE/488 cartridge is also available as an op-
tional extra.
The COMMODORE 64 will soon offer an ex-
ceptional word processing system that matches
or exceeds the qualities and flexibilities of
most "high-priced" word processors available.
Of course you can save the information on
either a 1541 Disk Drive or a Datassette TM
recorder and have it printed out using a VIC-
PRINTERor PLOTTER.
Applications requiring the use of a lightpen
can be performed by any lightpen that will fit
the COMMODORE 64 game port connector.
Your COMMODORE 64 PROGRAMMER'S REF-
ERENCE GUIDE includes a machine language
section, as well as a BASIC to machine code
interface section. There's even a bibliography
available for more in-depth study.
The COMMODORE 64 can be programmed to
handle a variety of entry-type business appli-
cations. Upper~lower case letters combined
with C64 "business form" graphics make it
easy for you to design forms which can then
be printed on your printer.
The COMMODORE 64 interfaces with a vari-
ety of dot matrix and letter quality printers as
well as plotters.
You can store your favorite recipes on your
COMMODORE 64 and its disk or cassette
storage unit, and end the need for messy rec-
ipe cards that often get lost when you need
them most.
INTRODUCTION xv
SIMULATIONS
Computer simulations let you conduct danger-
ous or expensive experiments at minimum risk
and cost.
SPORTS DATA
The Source™ and CompuServe™ both offer
sports information which you can get using
your COMMODORE64 and a VICMODEM.
STOCK QUOTES
With a VICMODEM and a subscription to any
of the appropriate network services, your
COMMODORE64 becomes your own private
stock ticker.
These are just a few of the many applications for you and your
COMMODORE64. As you can see, for work or play, at home, in school
or the office, your COMMODORE64 gives you a practical solution for
just about any need.
Commodore wants you to know that our support for users only STARTS
with your purchase of a Commodore computer. That's why we've
created two publications with Commodore information from around the
world, and a "two-way" computer information network with valuable
input for users in the U.S. and Canada from coast to coast.
In addition, we wholeheartedly encourage and support the growth of
Commodore Users' Clubs around the world. They are an excellent source
of information for every Commodore computer owner from the beginner
to the most advanced. The magazines dnd network, which are more
fully described below, have the most up-to-date information about how
to get involved with the Users' Club in your area.
Finally, your local Commodore dealer is a useful source of Commo-
dore support and information.
POWER/PLAY
The Home Computer Magazine
When it comes to entertainment, learning at home and practical home
applications, POWER/PLAY
is THEprime source of information for Com-
modore home users. Find out wh,ere your nearest user clubs are and
what they're doing, learn about software, games, programming tech-
niques, telecommunications, and new products. POWER/PLAYis your
personal connection to other Commodore users, outside software and
hardware developers, and to Commodore itself. Published quarterly.
Only $10.00 for a year of home computing excitement.
xvi INTRODUCTION
COMMODORE
The Microcomputer Magazine
Widely read by educators, businessmen and students, as well as
home computerists, COMMODOREMagazine is our main vehicle for
sharing exclusive information on the more technical use of Commodore
systems. Regular departments cover business, science and education,
programming tips, "excerpts from a technical notebook," and many
other features of interest to anyone who uses or is thinking about pur-
chasing Commodore equipment for business, scientific or educational
applications. COMMODOREis the ideal complement to POWER/ PLAY.
Published bi-monthly. Subscription price: $15.00 per year.
AND FOR EVEN MORE INFORMATION . . .
. . . DIAL UP OUR PAPERLESS USER MAGAZINE
COMMODORE INFORMATION NETWORK
The magazine of the future is here. To supplement and enhance your
subscription to POWER/PLAYand COMMODOREmagazines, the COM-
MODORE INFORMATIONNETWORK-our "paperless magazine"-is
available now over the telephone using your Commodore computer and
modem.
Join our computer club, get help with a computing problem, "talk" to
other Commodore friends, or get up-to-the-minute information on new
products, software and educational resources. Soon you will even be
able to save yourself the trouble of typing in the program listings you
find in POWER/PLAYor COMMODOREby downloading direct from the
Information Network (a new user service planned for early 1983). The
best part is that most of the answers are there before you even ask the
questions. (How's that for service?)
To call our electronic magazine you need only a modem and a sub-
scription to CompuServe™, one of the nation's largest telecommunica-
tions networks. (To make it easy for you Commodore includes a FREE
year's subscription to CompuServe™ in each VICMODEM package.)
Just dial your local number for the CompuServe™ data bank and
connect your phone to the modem. When the CompuServe™ video text
appears on your screen type G CBM on your computer keyboard. When
the COMMODORE INFORMATIONNETWORK'Stable of contents, or
"menu," appears on your screen choose from one of our sixteen de-
partments, make yourself comfortable, and enjoy the paperless maga-
zine other magazines are writing about.
INTRODUCTION xvii
For more information, visit your Commodore dealer or contact Com-
puServe™ customer service at 800-848-8990 (in Ohio, 614-457-8600).
COMMODORE INFORMATION NETWORK
Main Menu Description
Direct Access Codes
Special Commands
User Questions
Public Bulletin Board
Magazines and Newsletters
Products Announced
Commodore News Direct
Commodore Dealers
Educational Resources
User Groups
Descriptions
Questions and Answers
Software Tips
Technical Tips
Directory Descriptions
xviii INTRODUCTION
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