README.TXT  6/12/1991

We hope you will like PENDULUM, and if you do, we hope you will purchase
your very own, (cheap) registered copy. When you do, you will get the latest
version of the program, and a printed manual containing much additional 
information and an INSTRUCTOR'S GUIDE. Your name will be added to our 
mailing list, and you will receive notices about upgrades and about other 
educational programs which we plan to develop. Using your registered copy you 
will avoid delays in starting the program and you will no longer be shown the 
initial screens, which encourage unregistered users to buy the program. After
you receive your registered copy you will have access to our free technical
support for a period of six months. This support will be provided by mail
or through Compuserve.

With this program we introduce a novel approach to shareware distribution.
As with all shareware, we encourage you to make copies and to distribute the 
program as widely as you like. The novel features of our system are the 
following:

1)   You can duplicate and distribute registered or unregistered copies.
     Any copy you make of your registered program will, also be registered 
     for your computer but it change to "unregistered",when run on a different
     computer. 

2)   When you run an unregistered copy more than once, you will be offered
     ordering information. This information will contain a code for your 
     computer, and we will use this code to produce your registered copy.

3)   The Pendulum program uses several text files and it also comes with
     an INSTALL program, with this "README" file, and with some additional
     auxiliary files. To ensure that only complete and unadulterated copies
     are distributed, we require that all these files be present in their
     original form, for the program to run for the first time on any computer.
     For subsequent runs this requirement is relaxed, to let you edit some
     of the "help" files in accordance to your taste, or the needs of your
     students. You should keep one unmodified copy of the original disk, if
     you want to distribute the program for use on other computers. 
     

When you receive the disk registered for your computer, be sure not to 
run it on a different computer  (at least not before making a copy), 
or you will loose your registration.

To run the program simply put the floppy disk in the disk drive, close the
door, type a: (assuming that "a" is your floppy drive; or else type b: ) and
press the "enter" key. (At this point you have, most probably, done all this
already, since you are obviously reading this message). Then, at the DOS 
prompt type PENDULUM and press the "enter" key. 

You can also install the program in any directory of a hard- or floppy-disk
by copying all the files to that directory or by running the INSTALL
program. INSTALL can also be used for making copies, and will ensure that
all the necessary files are present and in good order. (Remember that all the 
files must be the original versions, for the program to initially run on a 
different computer).

Command line options are sometimes useful when running PENDULUM. For example 
type  PENDULUM L3B  and press "enter" if you want to use a laser printer (L)
which is connected to the parallel port 3 and in addition you want to enforce
"black and white" (B) or monochrome display. These choices are retained for
future runs until you enter another command line option. The defaults are 
LPT1, dot-matrix, and color. Use (D) for dot-matrix and (C) for color. 
The order of the parameters is irrelevant.