OTRONA ATTACHE Series Manual page 37

ca1culator
valet • s calculator Function
Valet's RPN calculator function provides the capability for temporarily
exiting from a program, performing a quick (or complex) calculation, and
returning directly to the interrupted program.
Using the RPN logic system, Valet's calculator allows you to perform
complex calculations easily. RPN, which is short for Reverse Polish
Notation (really!), is used by Hewlett-Packard and other pocket
calculator manufacturers. If you are not familiar wi th RPN, the
exercises in this chapter will step you through a number of calculations
using this logic system.
Besides the four basic functions (add, subtract, multiply, and divide),
Valet's calculator supports scientific notation and uses an eight-level
automatic register stack as a last-in-first-out temporary storage area
for storing operands and intermediate results.
Eight different memory registers may also be maintained manually. Four
of these registers are retained for storing constants between calculator
sessions; the other four are cleared when you exit from the calculator.
Since Valet's calculator is not limited by a one-line display, the stack
and memory registers are displayed and updated on the screen as an
operation is performed. Numbers are displayed to
14
digits and fractions
to 13 digits before conversion to scientific notation.
Actiyating ~ Calculator
Like other Valet functions, the calculator is accessed from Valet's Main
Menu. The Main l>1enu is accessed by activating Set-Up Mode and pressing
the
TAB
key. Then press C to select the calculator function.
MAIN
II
MENU
II
(A)LARMS
(C)ALCULATOR
(S)CREEN DUMP (I) NSTALL
PRESS ESC TO EXIT
BY9il
ssi ng ~ .Main
.Kenu
Like other Valet functions, the calculator may be activated directly from
Set-Up l>lode without displaying the Main Menu. To bypass the Main Menu,
activate Set-Up Mode and then press C to activate the calculator.
Exiting
~ ~
Calculator
When your calculation is complete, press the
ESC
kley to return to the
Main Menu, and then press
ESC
again to return to the program that was
interrupted for Valet processing.
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