UCALC v2.4
==========

    Features added
    --------------
    o Graphic plotting:
           - Fast plotting
           - CGA, EGA, Hercules, and VGA modes
           - Cartesian, Polar, and Parametric graphs
           - LINE, FILL, and RECTangle commands
           - Data from another file can be plotted
           - Support for up to 16 supper-imposed multi-color user graphs
           - Smart crosshair (moves gradually faster as you hold arrow keys)
           - Adjustable screen coordinate system
           - Adjustable precision for graphs
    o Ucalc now supports the factorial symbol (!).
    o There are other nice features that would have been added in this
      version but I need to hear the suggestions from you.  Talk to me.
      Anyone out there using UCALC? :).  Your financial support
      (registration) will also be greatly appreciated.

    Changes
    -------
    o The syntax for several commands is more flexible.  For instance
      LOAD"MYFILE.DEF", LOAD MYFILE.DEF, LOAD(MYFILE.DEF), are equivalent.
      Also, the ".." used in SOLVE, SUM, etc.. can be replaced by " to ".
      For instance SUM(x,1 to 10) is the same as SUM(x,1..10).
    o The variable PI, and the functions SEC (secant), CSC (cosecant),
      and COT (cotangent) are now built in.
    o The function definition space has been greatly increased, so that
      many more user functions can be defined.  Each expression however
      can use a maximum of 33 operators.
    o Due to support for the factorial notation with the "!" symbol,
      the "!=" symbol for "not equal" is no longer supported.  "<>"
      should be used instead.
    o So that UCALC can start up a bit faster, UCALC.DEF has been removed.
      Users can create their own UCALC.DEF file, or can modify, and rename
      UCALC.DE back to UCALC.DEF.
    o Several extra features are now reserved for those who register.


    Bug fixes
    ---------
    o Functions with multiple parameters can be a part of user functions
      without giving an error message.

    o UCALC /? no longer changes the screen color attribute.

UCALC v1.8
==========

    Features added
    --------------
    o Support for user functions with multiple parameters.
    o Support for implicit multiplication.
    o UCALC.DEF can contain any command.
    o Variable 'last' contains the value of the previous expression
    o Commands to change or remove the "ucalc> " and "Answer: " prompts
    o PRINT, SHELL, LOAD, WRITE (save), CLOSE, EXIT (quick exit), 
      LISTF (list user functions) commands.

    Changes
    -------
    o FIX controls number of decimal digits rather than total digits.
    o DIG command added to do what FIX used to do.
    o Due to support for implicit multiplication, users should now
      avoid giving a function the same name as a variable.
    o All the features previously reserved only for registered users
      are now available in the shareware evaluation copy.
      (This, unfortunately, seems to have been a bad decision, as
       the registration rate has dropped considerably).

    Bug fixes
    ---------
    o F1 and CLS no longer change color screen attributes.
    o Variables with embedded numeral digits no longer confuse the parser.
    o UCALC.DEF in a different directory no longer causes a problem.