HP 25 User Manual

Programming 81
To run the program switch to automatic RUN modePR G M.mIl RUN
and press 0 1 PRGM I (or ram @] @]) so that the calculator will
begin
execution from step 00. Then try the following example .
Example. Find the increase in volume of a spherical balloon if
the diameter changes from 30 feet to 35 feet.
Press Display
30
miim L..: I 3 ~ 0 . = 00 ,,----- --,
35 [R7SJ
1 8312.13
Displaying Each Step
Enter the original diameter
into Y.
Key the new diameter into X and
run the program. The answer, in
cubic feet, is displayed.
In order to look at this program, you need to be able to display
each step. Two operations allow you todo this:mJ (sillgle step)
andllm(back step).
With the increase in sphere volume program still rec or ded in the
calculator set the PRGM-RUN switch to RUN PRGM..:lRUN
and press 0 I PRGM I to resetthe calculator to step 00. Then switch
to
PRGM modePRGM'-RuN and press mJ once. The display
will
change to:
I 01 31
PressmJ again and the display will change to:
I 02 03
Now pressllm . You can see what has happened. You are back
at program memory step OI.Press Ilm again and step 00 is dis-
played . Pressing Ilm again does nothing.
mJ displays the contents of the next step of program memory.
Ilm displays the contents of the previous step of program
memory .
Of course , because these two keys work in PRG M mode,
neither can be stored in program memory.

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