The Museum of HP Calculators
This Hewlett-Packard advertisement, originally published in Scientific American,
is used by permission. If errors crept in during the scanning process, please
contact Dave Hicks
The HP programmables; or how to make a one-time investment in a machine you
Users of preprogrammed hand-helds who seek to extend their problem-solving
skills can find themselves stalled by their machines' built-in limitations.
For users whose needs are evolving, the practical entry-level choice for
personal data processing may well be the programmable machine.
Until about four and a half years ago, the slide rule was the personal number
processor "of choice"-- by necessity. Then, in 1972, Hewlett-Packard introduced
an alternative: the first of a series of preprogrammed. hand-held calculators
that virtually revolutionized numerical data processing.
Since then, we have pioneered another alternative: hand-held programmable
machines that expand their utility beyond the power resident in the key
functions, and thus offer the capacity to deal realistically with a user's
The keystroke programmable. The HP-25 ($145*) can be programmed by
a series of keystrokes to solve automatically the repetitive problems every
scientist and engineer faces. Its capabilities include branching, conditional
tests, full editing, and eight addressable memories. It also has 72 built-in
functions and operations, which can be incorporated into your programs to
save program steps, or used "as is."
The programmable with continuous memory. The HP-25C ($200*) adds a
continuous memory to the HP-25, so that it can retain programs or data even
when it is turned off.
The fully programmable.The HP-67 ($450*) is the most powerful hand-held
programmable HP has ever built. Programmed by prerecorded magnetic cards,
or by keystroke for programs you develop (which can also be stored on magnetic
cards for re-use), the HP-67 handles routines of up to 224 steps. But of
even greater importance is the HP-67's capacity for automatic merging of
keycodes (squeezing as many as three keystrokes into one step of program
memory). There are program packages for math, stat, EE, ME, clinical lab
and nuclear medicine, and surveying, available at $35* per pac.
The fully programmable with thermal printer. The HP-97 ($750*) has
all the capability of the HP-67, plus a built-in printer. Besides generating
a permanent record of your results, the printer can aid significantly in
programming, listing all or part of your programs complete with key memories,
or tracing operations and results of each step of a running program to facilitate
editing or debugging. While larger than pocket-sized, the HP-97 is small
enough (8 by 9 by 2.5 inches) to fit very portably into your briefcase.
A few words about machine "language."
All our hand-held and portable programmables incorporate HP's special RPN
logic system. It's simple, direct, and trustworthy. You can work involved
equations in the order you find natural, without having to enter or keep
track of parentheses and brackets. And you get answers you can trust! Programs
using HP's logic system are generally shorter than those using the logic
systems of most other machines, making the most efficient use of program
memory space. This, plus fully merged keystrokes, makes each programming
step a stride, not a hobble.
And added value.
If you are a professional, or aspire to be one, there's a programmable with
the range of power and features you need. Plus the engineering quality that
assures reliable performance. Plus worldwide service. Plus manuals and aids
to make programming a snap. If the notion of having a personal computer in
your pocket or briefcase seems attractive, the next step is up to you.
*Domestic USA prices only.
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