MANUAL FOR CALCEXE (BBC BASIC)

This file describes the program CALCEXE which is in effect a complete 
graphical calculator like those sold by Casio,but on a BBC,or indeed for use 
on any machine that interprets BBC BASIC.
The manual is (C)1997 SPROW and software is (C)1996 SPROW

INSTRUCTIONS-
At the BASIC prompt,type CHAIN"CALCEXE"

Depending on which filing system you're using,you'll need to alter some 
filenames.These are all held in the Extensions part of the calculator,and have
a file name such as 'CALCEXT'.Or similar.Simply edit this to suit the 
filenames you've chosen.

The program will then draw the calculator on the screen,in MODE 4.

The calculator uses the BBC's EVAL command for its interpretations,so data 
must be entered in the format that it understands.Also,fractions can be 
entered by pressing the 'fractions' button.See keypresses below.

Of more interest are the add on options:

*Graphics - display any graph on cartesian axis at any scale in any quadrant
          - regress a set of data linearly of curved to return to the 
            generating equation
*Intercepts - for the cross over of two or more curves
*Solver - solves simultaneous equations

Keys used:

Esc    End                           P      power
Tab    Toggle the sign               ^2     xý
Del    Backspace one                 r      root
Spc    AC                            ^r     xth root
Return =                             i      invert
t      tan                           !      Factorial
^t     tan-1                         p      insert ã
s      sin                           F0     help
^s     sin-1                         m      memory - RECALL (r)
c      cos                                         - CLEAR (c)
^c     cos-1                                       - ADD (+)
l      log to base 10                              - SUBTRACT (-)
^l     10x                           o      option - SIMULTANEOUS (1)
n      log to natural base                         - QUADRATIC (2)
^n     ex                                          - CUBIC (3)
f      fraction mode                               - GRAPHS (4)

KNOWN PROBLEMS/FUTURE ENHANCEMENTS-
No known problems

HISTORY-
V1.00 Original sent to BBC disk user groups,converted from a program 
      originally written for a PC