HP HP-65 - Running a Prerecorded Program

Sample Case: (12 X 5) + (11 X 4) + (10 X 3) =?
Press See Displayed
12 ENTER4 5 X
11 ENTER® 4 X +
10/ENTER% 3 X +
More Computing Power
The calculator also has nine addressable registers so that the
calculator can hold intermediate results or frequently used con-
stants. This means that calculations of considerable complexity
can be performed without reentering data or intermediate re-
sults. You now have some practice in calculating manually. We
will consider these registers and further capabilities for manual
calculation in the body of this handbook. In the meantime, let
us move on to the question of running a prerecorded program.
2. Running a Prerecorded Program
A built-in magnetic card reader/writer allows a program to be
permanently preserved on magnetic cards for future use. By
reading such a card, your general purpose calculator gains a
highly specific capability in a matter of seconds. Some users may
wish to use professionally programmed cards without themselves
doing any programming.
Irrespective of your major interests, we think that you may find
a use for the Personal Investment Program, the first program in
the Standard Pac shipped with your calculator. You will find the
prerecorded magnetic card for this program in the card case,
along with 18 additional programs, a head cleaning card, and
20 blank cards for recording your own programs.
The programs vary from general to specialized. Some programs
were selected from other pacs available through HP. For ex-
ample, the Pi Network Matching Program is from the EE Pac I,
the Mean and Standard Deviation program is from the Stat Pac,
etc. As leisure permits, you may wish to familiarize yourself with
them all and work the numerical examples. The Personal In-
vestment Program, however, is from no other pac. It was created
for you, to allow you to calculate the growth of a regular monthly