RPN-45 HD (iPad)

RPN-45 SD (iPhone, iPod touch)

• How the HP-45 computes trigonometric functions

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• A programmable HP-45!

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• "ENTER VS ="

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• Installing the crystal in your HP-45

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HP-45 Quick Reference Guide
The original reference guide that came with the HP-45. This early edition contains errors on pages 5 and 6, corrected in later editions.

HP-45 Owner's Handbook now as color PDF
An early edition of the user's manual. You may want to check out the Addenda below.
(Note that the result given on page 7 is wrong. The last three digits should be 225.)

HP-45 Owner's Handbook Addenda
This sheet explains register arithmetic added to later models of the HP-45.

HP-45 Applications Book now as color PDF
A wonderful book written by Hewlett-Packard Advanced Products Division, giving step-by-step solutions to more than 200 problems in mathematics, statistics, finance, engineering, navigation plus tips on more efficient calculator operations.

HP-45 Key Sequence Form new
A form in PDF format for documenting reusable key sequences.

http://www.hpmuseum.org
The number one URL for all things "HP calculators". At http://www.hpmuseum.org/simulate/sim45.htm there's even a Java application simulation of an HP-45 based on the real ROM microcode.
Manuals (and much more) may be purchased here: http://www.hpmuseum.org/cd/cddesc.htm

http://en.wikipedia.org/wiki/Reverse_Polish_notation
Good article about Reverse Polish Notation.

http://www.t-denker.de/hp45/
A browser-based simulation of the HP-45, written in JavaScript. Runs fine on Firefox – Safari and Google Chrome, however, report a type error, refusing execution. Not a perfect simulation, but a good example of the power of JavaScript (http://www.t-denker.de/hp45/hp45.750.js).