hpcalc.org - HP 28 Archive

HP 28 Applications

The first size listed is the downloaded file size and the second size listed is the size on the calculator.

There are 12 files totaling 133 KB in this category.

Airfoil Plotter   (details) 28 ENG   4 KB / 1 KB
Plots airfoils for remote control airplane and sailplane flyers, and prints them on the 82240 printer.
By Matthew A. Nelson. 1998-07-31

Aviation Computer and Flight Planner   (details) 28 ENG   8 KB / 3 KB
Collection of programs used for translation between different coordinate systems, calculating Great Circle distances and bearings, and calculating Radio Horizons. The programs may also be of use to anyone interested in Transverse Mercator Projection calculations.
By James Gentles. 1998-07-31

Car Trip Computer 1.0   (details) 28 ENG   7 KB / 2 KB
Program which provides the common statistics which most integrated car computers provide.
By Robert Peraino. 1998-07-31

Diary   (details) 28 ENG   3 KB / 1 KB
Small office manager program to keep track of dates.
By Strauss Erez. 1998-07-31

Ephemeredes of the Sun and Determination of Position 2.0   (details) 28 ENG   64 KB
Provides quick and accurate ephemeris of the sun without the bulk or cost of the yearly almanac. The program can be used to calculate the declination (Dec) and Greenwhich hour angle (GHA) of the sun for any time between March 1, 1900 and February 28, 2100. If the sunís observed altitude and your assumed position are also entered the program will provide the calculated altitude (Hc), azimuth angle (Azn) and intercept (Ic) thus allowing you to plot a line of position (St Hilaireís method).
By Henning Umland. 2019-02-19

Fertility Awareness   (details) 28 ENG   2 KB / 1 KB
This program calculates when to avoid pregnancy by counting days and considering the length of recent months. The algorithm is common, see the book Contraceptive Technologies by Robert A. Hatcher for example; the code for Julian dates is from Stephen Luse.
By Rick Allard. 2017-07-08

HP Read 1.3   (details) 28 ENG   20 KB
DOS program which reads data sent by infrared pulses from an HP calculator (such as an HP-28S) to a Radio Shack GP1U52X Infrared Receiver. Is now freeware rather than shareware because the author no longer supports it and because the postal address for registering is no longer valid.
By Mark Adler. 1998-07-31

HPPhone   (details) 28 ENG   2 KB / 1 KB
This program handles a list of names and phone numbers. It is possible to get the phone number of someone by his/her name or part of the name.
By Strauss Erez. 1998-07-31

Properties of Sections   (details) 28 ENG   8 KB
Calculates the moments of inertia, modulus (for base and face), area, position of neutral axis, and total height for sections.
By Ulrik Dan Christensen. 1998-07-31

Rolodex   (details) 28 ENG   3 KB / 1 KB
Rolodex program to keep track of names, addresses, and phone numbers.
By Eric L. Hernes. 1998-07-31

Tape Counter   (details) 28 ENG   2 KB / 1 KB
Convert cassette deck counters, tape counters, or VCR counters to real time and back.
By Jan Christiaan van Winkel. 1998-07-31

The 411 System 3.0   (details) 28 ENG   10 KB / 2 KB
Automates the creation, destruction, and traversal of these memory structures. It also automates movement of completed programs/objects into the specific utility areas or into the general utility area. It also controls workspace specific changes to the custom menu so that specific and general applications can remain transparent by being labeled in this menu.
By Tom Affinito. 1998-07-31

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