Primoz Jakopin:

A letter to the user of EVA CAI lesson

Dear user of CAI mode of EVA,

here are some very short instructions. I hope they will do for the beginning.

To play the lesson, provided on Internet page of EVA:
  1. Download and unzip eva.exe and eva.rsf files - click on English version of EVA, zipped, for Windows 95 - to some suitable directory, C:\EVA for instance.
  2. Make a shortcut to EVA.EXE, so that it will be accessible from the desktop. I usually give it the icon of a green tree, as EVA logo (a girl flying on a floppy) is still in the making.
  3. Download the lesson - click on Test lesson (CAI), 5 questions - to the same disk directory.
  4. Start EVA by clicking its icon.
  5. You find yourself in the disk menu, where confirm the Read file from disk option.
  6. In the disk directory select EVA_CAI_TEST_EN.EVA.
  7. In the main menu (access it with the mouse or via <Esc> key) select System, followed by System setup and change Double-diamond code to 36 ($) there.
  8. In the main menu select "Lessons" and any of the first four options in the submenu, Run the lesson sequentially, for instance.
  9. Play the lesson to the end.
The program will make a log file, a standard ASCII file, of every session. The one I played and which is provided on the same page looks like:


P. Jakopin

98/05/30 11.29 - 11.34 = 4'52''

11:29 : 1. The movement of air masses

11:30         maritime,warm

11:30 : 2. Air pressure change in an anticyclone

11:30         b

11:30 : 3. What is the name of a cyclone

11:30         cyclone

11:30 : 4. Concordances - a missing word

11:30         beauty

11:30 : 5. Text description

11:34         Obviously it is a text full of anagrams and written with a

              sole purpose to pack as many as possible in an average

              paragraph or two. The words such as gallery, regally,

              largely clearly confirm that statement.

                       The text resembles some psycho SF but somehow

              lacks real credibility.

Every entered question has the answers, entered by the student, the line below it.

Now how to help you make your own lesson. There are two simple languages involved, the EVA lesson command language, which governs the flow of the lesson and the EVA page description language, used to describe every page on screen. I have simplified both a little, in the direction of later JAVA use.

EVA lesson command language (ELCL):

there are 4 types of lines:
  1. lines that begin with a colon (:) - start of a new unit (question) after a colon a space is appropriate, followed by any name up to 100 characters. It will show in the log file.
  2. lines that begin with two colons (::) - start of a subroutine, accessed through "= gosub:subroutine name" command line. After two colons the subroutine name should be placed.
  3. lines which begin by an equal sign (=) - lesson commands. They can be modified and are stored in the "LESSON COMMANDS" EVA system table in EVA.RSF. You get any of them through "System"->"Get system table" menu sequence, store after modification through "System"->"Put system table" sequence and make modifications permanent by "System"-> "Write EVA.RSF".
  4. any other line, usually pertaining to page contents or description.
Every lesson also needs a title line, the first line of the lesson.

How to use the lesson command language, see my example.

EVA page description language (EPDL)

there are 3 types of lines:
  1. lines which start with at least two double-diamond (dollar sign in our simplified case) characters are end-of-page lines.
  2. lines which start with
    $ 4
    are PDL command lines. Such line has a structure:
    $ 4,entry 1,entry 2, ..., entry n.
    The shortest possible one is
    $ 4.
    which just deactivates the values of previous such command.
    Entries are of the type:
    where n can be one of the following:
    2: FONT
    34: LEFT MARGIN (x) in pixels
    35: TOP MARGIN (y)
    41: UNIT
    51-120: TABULATORS
    121: HISTOGRAM etc. line width

  3. ordinary lines with lesson contents or comments
Right margin justification of a block can be obtained by placing the screen cursor in the
$ 4...
line (anywhere in that line) and pressing the "+" key on the right (numeric) keypad, and a line can be centered by "Shift" "6" on that keypad (the line must between two "$ 4" command lines).

And how to see immediately what you have done?

In EVA (not in lesson mode of course) you get a screen preview of the page where the cursor resides by the function key <F3>. From the page preview back into the editor mode you get by <q> - quit command. The menu way to page preview is "Print"->"Show page".

The final remark - how to change the keyboard settings - they may be wrong on your keyboard:
  1. "System"->"Get system table"->"KEYBOARD"
  2. modify what is wrong, usig "Varia"->"Get character" on places where something should be corrected
  3. "System"->"Put system table" and, to make modifications permanent:
  4. "System"->"Write EVA.RSF".
So much for now.

With best wishes
P. Jakopin

Last change: May 31, 1998                                  Number of visits since 5/31/98      

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