                            CHEMICAL for TI-92
                               Version 2.1
                              by Oleg Dulin
                       dulino@craft.camp.clarkson.edu
            **************************************************

  "It is easy in the world to live after the world's opinion; it is easy in
   solitude to live after our own; but the great man is he who in the midst
   of the crowd keeps with the perfect sweetness the independence of
   solitude."

           by R.W.Emerson                                                                 


                                Legal Stuff

        I am releasing this program under GNU Public License. I beleive
        that it can be easily applied to software written for TI-92 and
        other graphing calculators and palmtops. The GNU Public License
        provides protection of free software in a number of ways:

        * It allows the original author to retain the software's
          copyright.
        * It allows others to take the software and modify it, or even
          base other programs on it.
        * It allows others to redistribute or resell the software, or
          modified versions of the software. However, in reselling or
          redistributing the software, you cannot restrict any of these
          rights from the party you are selling it to.

        To learn more about GNU Project go to http://www.gnu.ai.mit.edu.
        All I can say is that it originated from the idea to design a
        UNIX-clone that is free to everyone, a.k.a Linux. The idea was
        expanded to other platforms and types of software. I've recently
        sent email to GNU Project headquarters at MIT asking if it is
        allowed to apply GNU Public License to software applications
        written for TI-92. The response was positive.

        As far as I know, Chemical for TI-92 Version 2.1 is the FIRST
        program for TI-92 to be released under GNU Public License. Others
        will follow.



                                What is Chemical?


        Chemical for TI-92 is essentially a database of chemical elements.
        It features advanced search capabilities and data browser. It employs
        TI-92s advanced GUI to maximize the user-friendliness and manages
        to provide maximum performance possible with TI-92 BASIC.


                                   Requirements


        First of all you need a TI-92, TI-Graph Link software and a cable.
        You will need about 15 K of memory available in order to store the
        software.


                                  Brief User's Guide


        The program is fairly straightforward. It is started by executing
        chemical\chemical(). The main menu has the following options:

        F1 Select
            1:All - Prepares the whole periodic table for
              browsing
            2:Filter - Searches for a specific element or a group
              of elements by:
                1: Symbol
                2: Name
                3: Atomic Mass (approximate)
                4: Group
                5: Period
                6: Oxidation State
                7: Covalent Radius (approximate)
                8: Atomic Radius (approximate)
                9: Van Der Waals Radius (approximate)
                A: First ionization energy
                B: Electronegativity
                C: Electron Configuration (1s2-2s2-2p4...)
                D: Atomic Number

         F2 Browse - initiates the data browser:
                F1 Prev - goes to the previous element
                F2 Next - goes to the next element
                F3 Quit - quits to main menu

            If some information is either missing or -1 that means that
            the data is not available

         F3 About - shows the author's name, release date, etc.

         F4 Quit  - Leave the program



                        
                        Frequently Asked Questions


        1. What was the version 1.0 and 2.0 of the program?

        Version 1.0 was my first attempt. It was really buggy and slow.
        Version 2.0 was optimized to search the whole periodic table in
        15 seconds unlike Version 1.0 which spent 2 minutes doing that.

        2. Where can I get more information about Chemical?

        Send me email to dulino@craft.camp.clarkson.edu . The official
        Chemical for Ti-92 web page is under construction right now. It
        will be available at http://www.clarkson.edu/~dulino. It should
        be ready by 10/31/1996.




