Entry System - Casio Reckon User Manual

Entry System

ALG and RPN entry modes are supported. If the prompt is ">" you are in ALG mode, if you have 0 at the
bottom of the screen, you are in RPN mode.
In RPN mode, the bottom line is the top of the stack. One per line and the top line is level 8. RPN mode has
an 8 level stack. Press OPTN to toggle between RPN and ALG mode. [ ]
Todo: entry mode annunciator
Where it makes sense, the physical keys as labelled are used for their designated operation. So, for
example, sin enters sin( in ALG mode and performs sine on stack X in RPN.
The Reckon expression parser is relaxed about final closing parentheses. For example sin(1 will be
is not sin⁡ (1) but the variable sin1. sin(1+ is not legal.
accepted. Also sin(sin(1 and for matrices [[1,2][3,4. This is a convenience feature. However, note that, sin1
You can elide multiply in certain cases, immediately after a number and before a variable or function and
before parentheses. Examples: 2sin(1, 2X and 2(sin(1)+1). This can be useful in RPN. e.g. 2X can be
entered as part of usual number entry, also terms like 2π. Pi is bound to the π symbol (SHIFT EXP) and
also to the Pi() function.
The SHIFT key works in the usual way; press shift then another key for the shifted function. Do not hold
down shift. [ ]
Todo: shift annunciator
The ALPHA key works in the usual way; press alpha then another key for its alpha character. Press SHIFT
ALPHA for alpha lock, disengage lock by pressing ALPHA, EXE or AC. SHIFT ALPHA whilst in alpha lock does
not unlock (same as Casio). [ ]. Pressing SHIFT whilst in
Todo: alpha annunciator. shift + alpha for lower case
alpha, either immediately after the ALPHA key or in alpha lock allows the entry of lower case letters.
As well as on SHIFT +, X is mapped onto the XθT key. This works as a convenient way to enter the variable
X without a shift key press.
Hexadecimal and binary integers can be entered by prefixing with 0X (use the X key) and 0b respectively.
This is a bit experimental because only number input is supported, and there is no way to display an answer
in hex or binary.
that unary minus binds tighter so –x^2 is ( −���� ) and not − ( ���� ) .
2 2
Pre-minus, i.e. (-), is the same as operational minus, –, in ALG mode. There is no need for two keys. Note
In RPN mode, pre-minus is like +/– during number entry. You begin entering a negative number with (-)
and also for negative exponents. Pressing – in RPN always performs subtract, but (-) won't change the sign
of a number after entry, because it will begin a new number entry.
The change sign function (negate) is bound to the fraction key Ab/c. This will +/– in RPN or Neg() in ALG. Do
Abs is bound to SHIFT Ab/c. Abs performs | ���� | when x is real. For complex z, Abs(z) is the modulus and for
not use this during RPN number entry, use (-) to change sign.
matrix m, Abs(m) the determinant.
DEL performs a single character backspace for entry correction. ALPHA DEL is also DEL (currently).
SHIFT DEL (labelled INS) performs X<>Y SWAP in RPN.
The arrow key, , which means assign-to in Casio, maps to = for convenience. In ALG you assign with
expression like A=2 (with arrow or with = they are the same). In RPN you can use arrow a bit like STO, e.g.
23 EXE A  , to store 23 in A.
FD is mapped to Flt() the to-float converter. In ALG you can convert a rational to floating point with
FD e.g. Flt(ans). In RPN this is especially convenient for converting results (like large integers) to floats;
just press FD. Pressing FD again or with a float attempts to convert the float back to a fraction.
Factorial, the ! operator, is not marked on the keyboard. Reckon maps it to SHIFT 3.
For convenience [[ is mapped to SHIFT 2 (i.e. MAT).