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GEOS Inside and Out

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ISBN: 091643986X
Author: M. Tornsdorf and R. Kerkloh
Publisher: Data Becker GmbH
Year of publishing: 1986


GEOS (Graphic Environment Operating System) has changed the face of
home computing. Until now, home computer users were pretty much on
their own once they bought the computer, and either had to shell out the
money for ready-to-run programs, or go through the tedious process of
learning a computer language and do their own programming. But GEOS
comes with the 64C when you buy it—you’re ready to run it the moment
you get home.

Since we follow Commodore closely, we were wondering just what
difference there was between the "new" 64C and the old C-64. When we
saw GEOS, we were overjoyed. The 64 now has an advanced user interface
similar to GEM, an interface previously available only in much higherpriced
computers. Most commands don’t need to be typed in. Instead,
graphic symbols are used. Now when you want to delete a file, you no
longer need to type:


Now you just move an icon, or symbol that represents the program, and
"deposit" it in to another icon that looks like a waste basket. It’s hard to
believe what the developers of GEOS have done with the 64. We’ve spent
many hours in front of our 64’s learning about the the new GEOS system,
and we’re constantly amazed by its capabilities. GEOS is the user-friendly
interface that beginners have been waiting for.

A few points about our book:

1. If you have bought this book because you are still hesitant about
buying a computer and want some information about the 64C and
GEOS, to a great extent we wrote this book for you. There is a
thorough introduction to working with GEOS, with scores of
actual screen illustrations, to help you make your decisions about
your computer purchase.

2. If you are among those who already have a 64C (or an older
C-64) and GEOS, you will also find the introduction to GEOS
valuable. We’ll be pointing out all the things that GEOS can do.
Give your creativity free rein; we’ll try to spark your imagination
with the suggestions and hints we have to offer. GEOS will
allow the artist in you to run wild. Keep this book handy
whenever you work with geoWrite and geoPaint.

Do you have a favorite BASIC program in ’64 format—or even a
machine language program—that you would like to run under
GEOS? Do you want to create your own custom icons for your
programs running under GEOS? Or do you want to add your
name to the info box to identify yourself as the author of a
program? If you answered yes to any of these questions, then
Chapter 5 should be of special interest to you. It contains the
pertinent information and the FILEMASTER program, which
enables you to do all of these things and more.

3. Some of you may be programmers who would like to combine
your own program routines with GEOS. This book should
clarify the steps you need to know. We have saved you the
trouble of doing the "grunt work" of finding GEOS file structure,
joystick control, etc. Apply your energies to the programming,
and use the information and assistance contained in this book as

We think that it’s well worth the effort to write programs for and
under GEOS, and we want this book to support later adaptations
of the GEOS concept. However, since GEOS is a completely
new operatimg system, some memory locations specified in this
book may differ by a few bytes from those of your system.
We wish to thank Commodore for its friendly support. In particular, we
would like to thank Dr. Kittel, who helped us along throughout the project.

Manfred Tornsdorf
Riidiger Kerkloh
Muenster, Germany
July 30,1986

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