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The Old Geezer
RPN Engineering Calculator™ (REC)

The REC is Windows software that lets you choose between 7 different calculators at the Click of your mouse, and 15 discrete calculators for the more complex functions plus you can write your own programs to solve your most elaborate equations.

This RPN Calculator offers a choice of more than 280 solutions and thousands of conversion possibilities with nine unique keypads. A "Tip of the Day" is displayed when you start the program (it can be turned off), It has a complete help system and individual tips for all but the most ordinary functions. The calculator has a Running Tape Display showing all entries and solutions for each session as well as the operation just performed (+, ÷, etc.), or the units (Hz, °, Hy, etc.) of the result.

You can choose between fixed point, scientific, and engineering notation, and select degrees, radians, or grads as the situation requires. Keyboard entry is optional for most of the common functions.  

You are able to save the contents of the calculator, the Running Tape Display, the Register Stack, all necessary data required to be able to take up where you left off prior to saving. You can print the contents of the Running Tape Display and you can double-click on any number in the Running Tape Display or the Stack Display to copy it to the x-register.

The RPN Engineering Calculator™ uses an entry register (input window), a working register, referred to as the x-register (x-reg) and a holding register, referred to as the y-register (y-reg), an almost unlimited stack, and 24 storage registers.

Following are links to short descriptions of the available functions on each of the nine keypads, Click on the link to view the description.

The Memory Array keypad is used to manipulate the 24 storage registers.

The Program Keypad is for running any of your personal programs.

The Standard (Std) Keypad has many of the standard functions available on most  Scientific Calculators, this calculator takes it somewhat further!

The Engineering (Engr’g) Keypad  has several functions to help the engineer.

The Binary Keypad  is used to manipulate binary integers of any word size from 4 to 64.

Use the Magnetics Keypad to calculate various solutions dealing  with the design of transformers and inductors.   

The Trigonometry (Trig) Keypad, as might be expected, most of these functions deal with trigonometry.

The Convert Keypad consists of many different conversions, there is also a Physical Constants ('K') function and a ('val') function that calculates the value of Resistors, Capacitors, and Inductors, based on the color or numeric code on the component.

The final RPN Engineering Calculator™ keypad, the Tables Keypad  calculates and lists information about various hardware and other useful information.

Some of the functions available while in most keypads are:
(Click the thumbnail to see a full size view of the calculator, use your web browser's Back button to return here.)

View lets you toggle between the standard interface (shown at the right) and the enhanced view, Click for more information.  Two other views are available, one that lets you view just the y-register and the other that lets you view the lastx register.

Drop - deletes the current value in the x-reg, placing it in the last x register, and Drops the number in the y-register down into the x-register.

x<>y - exchanges the values in the x and y registers.

Lastx - retrieves the last number that was used in a calculation.

REG - is used to save and recall numbers in the Memory Array, 24 memory registers.

CHS - changes the sign of the mantissa or exponent of the number being entered.  (This function is replaced by the Mod function in the Binary Keypad).

EEX - to enter number multiplied by the power of 10.

There are many functions that can be accessed using the keyboard, click to see a handy, printable table.

The Cursor keys offer different methods of changing the active Keypad.

File Menu (Click here to see what's on the File Menu)

Sample Printout

This thumbnail is a sample printout of the Running Tape Display after having made several calculations and performing a few of the available functions.

Click on the thumbnail to see a full-screen view of that screen shot, then use your Web browser's Back button to return to this page and download the RPN Engineering Calculator™.

What's New?  Latest Version 12.0.0 Click here to see what's new


       Getting the REC

Unzip the files to a convenient location, read the readme.txt file, then run RECsetup.exe to load the files required to run rpn.exe.

You are free to use the calculator for 30 days, after that you are required to register it for $59.95 (US), at which time you will be given a registration number which is required to keep using this RPN Calculator.

Download/View the REC Programming Language Manual

Download Adobe Reader

Applying the Registration number

To enter the registration number, from within RPN, Click File, Enter Registration Code, then enter your registration number in the place provided.

When upgrading from any version 6.x or lower please uninstall RPN and download the latest version above prior to applying the registration. Note your old registration number will not work, you will need to purchase a new one.