GUIDE TO DIFFERENT FILE FORMATS ON THE INTERNET
for Casio Graphic Calculators.

(c) Roy F. A. Maclean 5th December 1997 (roym@maths.ex.ac.uk)
http://www.maths.ex.ac.uk/~roym/calc/casio/index.html
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Note that Tom Wheeley's free CaS program can convert files
from .cas to .ctf format and vice versa. For details see:
http://www.york.ac.uk/~tw104/casio/index.html

.cas
-------
The original official casio format for transferring files
from your computer to calculator via a cable.
It is a binary file format which isn't readable by humans without
a display program.

.fxi
-------
The format used by the program from Yellow Computing in Germany.
It is a binary file format which isn't readable by humans without
a display program.

.ctf
-------
A lot of people have put programs on the internet using plain 
ascii text using things like =>  ->  >= Goto Dsz Prog
so that it is readable and people can type the program into 
their calculator.
But everyone used their own slightly different notation
therefore .ctf came about, after discussions with several
web page owners, as an attempt to produce a standard
notation everyone could stick to, which also means a computer could
read this standard and transfer programs onto a calculator
without the user having to type them in.
So .ctf is both human and computer readable.
Tom Wheeley's software as mentioned above came about because Casio's
official transfer software was so expensive at the time 
and only used .cas files. 

.cat
-------
Casio Corp. decided to come up with their own human readable format,
called .cat but it only works with 9x50 models 
and isn't really very human readable after all.
Casio now supplies free software to transfer files to 9x50 models see: 
http://pegasus.cc.ucf.edu/~ucfcasio/programs.htm

other
-------
There are many programs on the internet where the author
has used their own notation which is usually similar to .ctf
since many symbols have an obvious ascii parallel e.g >= for
the greater than or equal sign. 
Therfore usually these programs can be edited to conform to .ctf without
to much effort.
Sometimes programs are displayed as image files in order to appear
as they would on the calculator.