This file contains a short description of CALCULATOR version 1.0.
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CALCULATOR is a memory resident program (TSR) which, after installation
in memory can be invoked at any moment by pressing a hot-key combination
(Alt-Shift).

To install CALCULATOR in memory just type in CALC and press <Enter>.
After that you will see a one-page message from the authors of the program.

From now on, CALCULATOR stays in memory (it takes around 80KB of RAM).
You can invoke CALCULATOR by pressing Alt-Shift keys simultaneously.
When you do it, a calculator pops up on the screen, even if you are running
another program e.g. a text editor.

              FUNCTIONS OF THE CALCULATOR
              ---------------------------

 <BIN> BINary mode                < ( > open bracket
 <HEX> HEXadecimal mode           < ) > close bracket
 <DEC> DECimal mode               <TAN> TANgens
 < C > Cancel last operation      <SIN> SINe
 <CA > Clear All                  <COS> COSine
 < + > addition                   < % > percent
 < - > subtraction                <LOG> decimal LOGarithm
 < * > multiplication             <LNx> Natural Logarithm
 < / > division                   <e^x> e to the power of x
 < = > display result             <  > pi
 <NEG> NEGation                   <1/x> 1 divided by
 <F > switch to Fahrenheit mode  < x> square
 <C > switch to Celsius mode     <x > square root
 <Mwr> WRite to Memory            < !x> factorial
 <Mrd> ReaD from Memory           <x^y> x to the power of y


       Additional functions:
       ---------------------
Press <F1> function key to display a help window.
To enter a number use numeric keys : <0>..<9>, <->, <.>.
Use <E> key to enter the exponent.

To select a function position the cursor on the, appropriate key using :
<Arrow Keys>, <PgUp>, <PgDn>, <Home>, <End>, and then press <ENTER>.

The line above the display is the Status Line.
The Status Line contains the information about the current mode of the
calculator :
 - BINary, HEXadecimal, or DECimal mode of display ;
 - DEGree or RADian mode for trigonometric functions ;
 - Celsius or Fahrenheit mode ;
 - ( - number of open brackets entered ;
 - ) - number of close brackets entered.

History window displays a list of intermediate results and operators used.


Pressing <Esc> closes CALCULATOR but it remains in memory, so you can
invoke it as many times as you like.

If you want to remove CALCULATOR from memory just press Ctrl-Shift
simultaneously when you are at the DOS prompt.
