README.V30
This file lists the changes  from version 2.2/2.3 of RPN to version 3.0.
RPN is an MSDOS-based emulator of an HP-29C calculator, with extensions.
It assumes an 80x25 text display.  It currently offers about 100 functions.

New Functions
~~~~~~~~~~~~~
- The `sqr(X)' function is documented now.
- Factorial and gamma functions added.
- More Hyperbolic trig. functions added: isinh, icosh, itanh (inverses),
  csch, icsch, sech, isech, coth, icoth.
- clrblk function allows a range of memory registers to be cleared
  (Y and X registers point to first, last memories to clear).
- 22 new unit conversions (plus extant degrees/radians, polar/rect,
  time conversions).
- 5 new constants (including speed of light in furlongs/fortnight).
- Statistical:
  geometric mean, harmonic mean, (set) linear coefficients, interpolate
  y from x (using linear coefficients), interpolate x from y, linear
  regression, (additional) linear-regression statistics.
- Save-file feature, including functions to "print" stack, registers,
  summation and linear-regression results.
- Fixed- or scientific-notation display.
- Temporary escape to sub-shell (oh boy!)


New Behavior
~~~~~~~~~~~~
A companion program, RPNINST.EXE, may be used to alter the screen colors.

Most control functions are now attached to the Function keys:
  F1 selects and deselects the two Help screens.
  F2 opens and closes the save-file.
  F3 toggles between scientific, fixed, and "default" number displays.
  F10 quits the calculator; if shifted or <CTRL>'d it leaves the
     screens visible, or escapes to a sub-shell.

RPN can make use of a configuration file to:
- Install constant values into memory registers.
- Force BIOS output instead of of direct screen writing (may help with
  some compatibility problems).
- Change the keys used to represent hexadecimal digits.
RPN will only look for a configuration file if told to, through a
command-line option.  It will accept a filename, or look for a default
file, if given the `-c' option.

The hexadecimal digits are now represented by some ALT keys, namely
<ALT>-A through <ALT>-F.  If this selection is unsatisfactory it
can be customized (see above).

RPN can now save its results to an output file.  Each function is
listed along with the X, Y, and LastX registers.  In addition, specific
printing functions are available (see above).

The rather-unintuitive `A' for `recall' has been replaced by `R'.
Shifts between degrees-mode and radians-mode are now done with
<CTRL>-D and <CTRL>-R, while conversions of degrees to radians and
vice-versa are functions rad(X) and deg(X).


FV listing of PKZIP'd executables:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:\T fv rpn30exe.zip

Archive:  RPN30EXE.ZIP
Name         Length    Method    SF   Size now  Mod Date    Time     CRC
============ ========  ======== ====  ========  =========  ======== ========
RPN.EXE         57570  Imploded  38      35315  29 May 90  13:00:56 2E1AECA1
RPNINST.EXE     18564  Imploded  45      10179  29 May 90  13:01:28 1D9C7F7D
CONFIG.RPN       2909  Imploded  47       1527  27 May 90  22:49:36 38E35D50
============ ========  ======== ====  ========  =========  ======== ========
*total     3    79043  ZIP 1.10  40%     47327  29 May 90  13:06:38