Here's some explanations of the programs for the TI-81 that I've written.

conventions:
Anything that could not be directly represented in text was given a symbol
        which represents the same thing.  I think most of them are self-
        explanatory, but here are the symbols I used.
sqr = square root.
-> = store
(pi) = pi.  There is a pi key on the calculator.  It is: <second>^
exec(progname) = run this program.  substitue "Prgmx" for this, where x
        is the number corresponding to the appropriate program.

Remember that the names of the instructions are not typed in directly, but
        are under the various menus which can be accessed.

note: to save a little space in the programs, wherever "^2" is printed,
        use the squared key, which will perform the same job, using only
        one byte instead of two.

programs:
This is a description of the programs I in the file "TI.81.programs".
        All of the programs are written by Aaron Goldstein.

program: RANGE
This program simply sets up the screen according to my own specifications.
        The numbers it uses give screen ranges which result in pixels that
        are mathematically square(each pixel represents the same distance
        vertically and horizontally).

program: MOVEVIEW
I wrote this to move the viewscreen around.  It simply changes the X/Y-min
        variables without changing the proportions of the screen.  The
        only problem with it is that the Xscl and Yscl setting do not work
        exactly as I intended them to(eliminate these lines from the
        program if you wish, they will have no effect on its intended
        purpose).

program: SIZEVIEW
This was an effort to automatically change the size of the screen without
        changing its "shape".  It takes the user input and changes the
        size of the screen according to that.  The proportion of
        (Xmax-Xmin)/(Ymax-Ymin) does not change.

program: PHASE
This is a physics program designed to graph wave interference.  It graphs
        the function sin(X), graphs a wave with a frequency and phase
        change given by the user, and then it graphs the resulting
        interference pattern.  When it exits, it turns all functions on
        that are entered, so you may have to cancel those that you do not
        wish to graph.  BTW: a phase change of +90 degrees, (pi)/2 radians
        is the equivalent of cos(X).

program: CYCLOPS
This was the result of playing around with ellipses for several hours last
        week.  The Cyclops program doesn't serve any useful purpose, I just
        wrote it for fun.  See what it does for yourself! :)

I also have the MICKEY program on my calculator(draws Mickey Mouse), but
        I didn't write it, so I'm not going to upload it.

If you like this stuff, tell me, or send me your programs.  I think it'd
        be great to some other stuff.

info: (about me -> Aaron Goldstein)
I'm a junior at Nyack High School in Nyack, New York.  I got a TI-81
        graphing calculator about a month and a half ago, and I've been
        playing with it ever since.  I also like to write programs for real
        computers.  I've only uploaded one program(projectile motion), for
        the apple IIgs, and I'm thinking of trying to move that over to
        an IBM compatible.

have fun folks!:)
peace...

electronic address:
        AOL - Breadmold1
            - Aaron sten(don't write here, I check mail about once a month
                if that much)