EC-4043  (650-0807)              Operation             Faxback Doc. # 3442

Turning the Calculator On and Off

The calculator turns on automatically when you expose the solar panel to
an adequate light source.  Before using the calculator, however, you
should always clear it by pressing AC/ON.

Notes:  When the calculator is first exposed to light, random segments and
        indicators may appear in the display.  The three memories and the
        statistical registers also may contain random values.  Pressing
        AC/ON clears these values.

        When you press AC/ON, "0" and DEG appears in the display.  The 
        calculator is then ready for you to begin your calculations.

        The calculator turns off automatically when the solar panel is no
        longer exposed to an adequate light source.  (You can easily turn
        the calculator off by closing the carrying case.)  The display,
        any pending operations, the automatic constant, the memories,
        and the statistical registers are cleared.

Note:  The calculator does not actually turn off until approximately 1 to
       20 seconds after you remove it from the light source.  If you
       re-expose the solar panel to light within approximately 10 seconds,
       the calculator is not cleared.

Clearing the Calculator

The AC/On key resets the calculator to the decimal mode with floating-
decimal display, and resets the angle units to degrees (DEG).  This key
also clears the display, memories statistical registers, error conditions,
and pending operations.

Clearing the Display and Pending Operations

The CE/C key clears incorrect entries, error conditions, the display, and
pending operations.  Pressing CE/C does not affect the mode, display
format, angle units, memories, or statistical registers.

  To clear an incorrect numerical entry, press CE/C once.

  To clear an error condition, indicated by Error in the display, press
  CE/C once.

  To clear the display and all pending operations, press CE/C twice.

Clearing a Memory

To clear one of the three memories, press STO followed by 1, 2, or 3
when a zero is in the display.

Clearing the Statistical Registers

The statistical registers are cleared when you press 3rd [STAT 1] or
3rd [STAT 2].

During a series of statistics calculations, you can press 2nd [CSR] to
clear previous data before entering each new data set.

Note:  If you press 2nd [CSR] when the calculator is not in a statistics
       mode, an error message appears.

Algebraic Operating System

The AOStm Algebraic Operating System completes all operations according to
their relative priorities, which are listed below.

Priority               Operations

1 (highest)            Trigonometric, hyperbolic, square,
                       square root, cube root, factorial,
                       reciprocal, angle conversion, combinations,
                       permutations, percent, logarithms, change sign,
                       metric conversions, logical NOT

2                      Universal powers and roots
3                      Multiplication and division
4                      Addition and subtraction
5                      Logical AND
6                      Logical OR, XOR, XNOR
7                      Close parenthesis
8 (lowest)             Equals

Operations in priority 1 are immediate functions; they are performed as
soon as you press the operation keys.

Operations in priorities 2, 3, and 4 are completed by any operation with
the same priority or with a lower priority.

The = key completes all operations.

(LB/all-12/05/94)