HP 25 User Manual

74 Programming
Three Modes of Operation
There are three ways to use your HP-25 calculator:
I. Manual R
UN mode PRGM" RUN
2. PROM mode PRGM'-RUN
3. Automatic RUN mode PRGM" RUN
Manual RUN Mode
The functions and operations you have learned about in the
first four
sections of this handbook are performed manually one
at a time with the PROM-RUN switch set to RUN P.oM" RUN.
These functions combined with the automatic memory stack
enable you to calculate
any problem with ease.
PRGM Mode
In PROM (program) mode the functions and operations you
have
learned about are not executed, but instead are recorded
in a part of the calculator called program memory for later
execution. All operations on the keyboard except three can
be recorded for later execution with the PROM-RUN switch
set to
PRO M PRGM '-RUN • The three operations that cannot
be recorded are :
mI
1m
a I PRGM I
These three operations work in PROM mode to help you write
and record
your programs.
Automatic RUN Mode
The HP-25 can also be used to automatically execute a list
of operations with the PROM-RUN switch set to RUN
PRGM" RUN if they have previously been recorded in program
memory. Instead of your having to press each key manually,
the recorded
operations are executed sequentially in automatic
RUN mode when you press[E[] (rul1 / stop). You press only one
key and the entire list of recorded operations is executed much
more quickly
than you could have executed them yourself.

HP 25 Specifications

General

Power Source	Rechargeable battery pack
Programming Steps	49
Release Year	1975
Functions	Trigonometric, logarithmic, statistical
Type	Scientific
Dimensions	148 x 80 x 14 mm