EC-449  (650-0925)        Special Function Keys       Faxback Doc. # 6465

DISPLAY SYMBOLS

DISPLAY                            FUNCTION

-E- or -C-                         Error indication.
SHIFT                              Secondary function mode.
M                                  A value is stored in memory.
K                                  A constant is set.
DEG, RAD, or GRA                   An angular function is set.
FIX                                Decimal places specified.
SCI                                Significant digits specified.
SD                                 Standard deviation calculation.

The display can show a mantissa of up to 8 digits and an exponent of up
to two digits.

SPECIAL KEY FUNCTIONS

This section describes the special keys that affect the overall operation
of the EC-449.

Note:  On all references to key entries, the number keys 0-9 are shown
       without a box, the mathematical functions +, -, X, = and Division
       are shown in a box, with white characters on a black foreground,
       and all other mathematical functions (SHIFT, SIN, etc.) are shown
       in a box with black characters on a white foreground

KEY                         FUNCTION

SHIFT   To keep the calculator as compact as  possible, some keys have
        more than one function.  SHIFT changes the main function to
        the secondary function (printed in brown above the key).

MODE    The calculator uses 8 different modes of operation,  MODE put the
        calculator into the selected mode.

To put the calculator into the desired mode, press MODE then a number (0,
or 4 - 9) or the decimal point (.).

CALCULATION MODES

MODE O COMP Mode.  Exits the statistical calculation mode to carry out
                   ordinary arithmetic and functional calculations.

MODE . SD Mode.   Calculates standard deviation.  SD appears on the
                  display (see "Standard Deviation").

ANGULAR UNIT MODES

MODE 4 Degree Mode.    Sets the angular mode to degrees.  DEG appears on
                       the display (see "Angular Mode").

MODE 5 Radian Mode.    Sets the angular mode to radians.  RAD appears on
                       the display.

Mode 6 Gradient Mode.  Sets the angular mode to gradients.  GRA appears
                       on the display.

DISPLAY MODES

MODE 7 FIX Mode.  Sets the display to show a specified number of decimal
                  places.  FIX appears on the display (see "Setting
                  Decimal Places (FIX)").

MODE 8 SCI Mode.  Sets the display to show a specified number of
                  significant digits.  SCI appears on the display (see
                  "Setting Significant Digits (SCI)").

MODE 9 Cancels the FIX or SCI setting.  Also changes the range of the
       exponent display (see "Scientific Notation")

+/- Changes the sign of the displayed value or exponent.

()  Parentheses let you perform lower priority calculations before
    previously entered calculations.  You can enter up to six levels
    of parentheses (parenthetic expressions within parenthetic
    expressions).  The display shows the number of parentheses entered.

MEMORY

MIN            Clears the previous contents then stores the displayed value into
               memory.

M+             Adds the displayed value or the result of a pending calculation
               to the value in memory.

SHIFT M-       Subtracts the displayed value or the result of a pending
               calculation from the value in memory.

MR             Recalls the memory contents to the display.

SHIFT X <->M   Exchanges the displayed number with the memory contents

When you store a value in memory, M appears on the display.  The contents
are preserved in memory even after you turn off the power.  To clear the
memory, press AC MIN.

(SMC/all-06/06/94)