OTRONA ATTACHE Series Manual page 49

calculator
Exchanging Lhe
X
~
X
Registers
Pressing the X key exchanges the contents of the X Register with the
contents of the
Y
Regi ster. Wha t was in the
X
Regi ster is now in the
Y
Register and vice versa. Pressing X again returns the registers to their
original status.
Scientific Notation
Scientific notation is engaged by pressing E. This is a convenient
numbering system for very large numbers or very small fractions. Valet's
calculator is capable of both displaying numbers in scientific notation
and making calculations using numbers entered under scientific notation.
Under scientific notation, the value E on the display stands for the
power of ten to the power represented by the next number that is keyed.
For example, rather than typing 2500000 for a calculation, you could just
type 25 E 5. This is 25 times ten to the fifth power. The number will be
converted to 2500000.
When using scientific notation, enter the first number (25 in the example
above) and then press E. When E is displayed on the screen, key the
second number
(5
in the example above). When you press
RETURN
or enter
another number, the entry will be displayed as 2500000 on the screen.
~
Problems
Example t 1:
You key:
2
RETURN
3
+
2 + 3
(2
plus
3)
Current Entry
X Register
Y Register
Current Entry
Y Register
X Register
2
2
2
3
o
5
displays current entry (2)
stores current entry (2) in X REG.
displays current entry (3) and
bumps X REG. (2) to Y REG.
adds 2 plus 3, stores result in X
REG. and clears Y REG.
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