Main Menu
=========

     |----+-----Calc 2.00-----+----1
     |FLR |CEIL|RND |TRNC|CLN2|FLT |
     |----+----+----+----+----+----|
     | LN |EXP |    |ABS |IDIV|MOD |
     |----+----+----+----+----+----|
     |SIN |COS |TAN |SQRT|y^x |1/x |
     |----+----+----+----+----+----|
     |  ENTER  |+/- |EEX |UNDO| <- |
     |-----+---+-+--+--+-+---++----|
     | INV |  7  |  8  |  9  |  /  |
     |-----+-----+-----+-----+-----|
     | HYP |  4  |  5  |  6  |  *  |
     |-----+-----+-----+-----+-----|
     |EXEC |  1  |  2  |  3  |  -  |
     |-----+-----+-----+-----+-----|
     | OFF |  0  |  .  | PI  |  +  |
     |-----+-----+-----+-----+-----+

This is the menu that appears the first time you start Keypad Mode.
It will show up in a vertical window on the right side of your screen.
Above this menu is the traditional Calc stack display.  On a 24-line
screen you will be able to see the top three stack entries.

The ten digit keys, decimal point, and EEX key are used for entering
numbers in the obvious way.  EEX begins entry of an exponent in
scientific notation.  Just as with regular Calc, the number is pushed
onto the stack as soon as you press ENTER or any other function key.

The +/- key corresponds to normal Calc's `n' key.  During numeric
entry it changes the sign of the number or of the exponent.  At other
times it changes the sign of the number on the top of the stack.

The INV and HYP keys modify other keys.  As well as having the effects
described elsewhere in this manual, Keypad Mode defines several other
"inverse" operations.  These are described below and in the following
sections.

The ENTER key finishes the current numeric entry, or otherwise
duplicates the top entry on the stack.

The UNDO key undoes the most recent Calc operation.  `INV UNDO' is the
"redo" command, and `HYP UNDO' is "last arguments" (`M-RET').

The <- key acts as a "backspace" during numeric entry.  At other times
it removes the top stack entry.  `INV <-' clears the entire stack.
`HYP <-' takes an integer from the stack, then removes that many
additional stack elements.

The EXEC key prompts you to enter any keystroke sequence that would
normally work in Calc mode.  This can include a numeric prefix if you
wish.  It is also possible simply to switch into the Calc window and
type commands in it; there is nothing "magic" about this window when
Keypad Mode is active.

The other keys in this display perform their obvious calculator
functions.  CLN2 rounds the top-of-stack by temporarily reducing the
precision by 2 digits.  FLT converts an integer or fraction on the top
of the stack to floating-point.

The INV and HYP keys combined with several of these keys give you
access to some common functions even if the appropriate menu is not
displayed.  Obviously you don't need to learn these keys unless you
find yourself wasting time switching among the menus.

`INV +/-'
     is the same as 1/x.
`INV +'
     is the same as SQRT.
`INV -'
     is the same as CONJ.
`INV *'
     is the same as y^x.
`INV /'
     is the same as INV y^x (the `x'th root of `y').
`HYP/INV 1'
     are the same as SIN / `INV SIN'.
`HYP/INV 2'
     are the same as COS / `INV COS'.
`HYP/INV 3'
     are the same as TAN / `INV TAN'.
`INV/HYP 4'
     are the same as LN / `HYP LN'.
`INV/HYP 5'
     are the same as EXP / `HYP EXP'.
`INV 6'
     is the same as ABS.
`INV 7'
     is the same as RND (`calc-round').
`INV 8'
     is the same as CLN2.
`INV 9'
     is the same as FLT (`calc-float').
`INV 0'
     is the same as IMAG.
`INV .'
     is the same as PREC.
`INV ENTER'
     is the same as SWAP.
`HYP ENTER'
     is the same as RLL3.
`INV HYP ENTER'
     is the same as OVER.
`HYP +/-'
     packs the top two stack entries as an error form.
`HYP EEX'
     packs the top two stack entries as a modulo form.
`INV EEX'
     creates an interval form; this removes an integer which is one of
     0 `[]', 1 `[)', 2 `(]' or 3 `()', followed by the two limits of
     the interval.

The `OFF' key turns Calc off; typing `M-# k' or `M-# M-#' again has
the same effect.  This is analogous to typing `q' or hitting `M-# c'
again in the normal calculator.  If Calc is running standalone (the
`full-calc-keypad' command appeared in the command line that started
Emacs), then `OFF' is replaced with `EXIT'; clicking on this actually
exits Emacs itself.