Free42

Thomas Okken

- December 7, 2013

1

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(540)

Description

Free42 is a re-implementation of the HP-42S calculator and the HP-82240 printer.

It is a complete rewrite, not using any HP code, and it does not require an HP-42S ROM image.

Free42 is an Open Source project. The executables and source code are released under the terms of the GNU General Public License, version 2.

All third-party code used in Free42 is either in the public domain, or licensed under terms compatible with GPLv2, or used with the authors' permission.

It is a complete rewrite, not using any HP code, and it does not require an HP-42S ROM image.

Free42 is an Open Source project. The executables and source code are released under the terms of the GNU General Public License, version 2.

All third-party code used in Free42 is either in the public domain, or licensed under terms compatible with GPLv2, or used with the authors' permission.

You must install this app before submitting a review.

Google Play reviews now use Google+ so it's easier to see opinions from people you care about. New reviews will be publicly linked to your Google+ profile. Your name on previous reviews now appears as "A Google User".

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# Reviews

Helpfulness

Newest

Rating

Helpfulness

All Versions

All Versions

Latest Version

4.8

540 total

5 488

4 37

3 6

2 2

1 7

Peter nospam

Outstanding Free. No ads. Detailed user manual. Dedicated forum. Responsive developer. Does what it says. No bugs no muss no fuss. What more can you want!?!? On top of that, it filled an important niche for me. I'm a big fan of HP calculators and use my Droid48 for most things. But I need an RPN app that will fit into about half my Galaxy S4 screen in multi-window view so I can do calcs while looking at data in another half of the screen (which houses "simple checkbook" program). Droid48 with its complicated keyboard becomes unmanageable at half-screen size. I can add apps to multi-window manu using Wanam Xposed module "RPNcalulator" shows up in the menu, but when I put it into a window it just acts weird (doesn't shrink the way it's supposed to). "Simple RPN" doesn't even show in the menu. Free42 shows in the menu and scales perfectly for a very useable RPN calculator in half my screen. Adjusted the default to Fix 2 and it's exactly what I need for quick calcs while looking at my checkbook.

Lance Hayes

Great app My hp 42s has broken down and you can't get them anymore so I was very happy to see this app. Thanks

Brandyn Pedersen

Student. I am a Civil Engineering major this calculator saved me from buying one. I will donate immediately when my funds are able. Appreciate it!

A Google User

Brilliant implementation. Amost as good as the real thing!! Great Work

Linc H

Engineer Absolutely brilliant. I still have, and use, the original hardware version of the HP42s. Now I can always have it with me in my pocket wherever I go. Best app on my phone!

User reviews

Brilliant implementation. Amost as good as the real thing!! Great Work

Great program Free42 offers a near-perfect replacement for the real HP42S calculator. The real calculator vanished in the drawers some years ago: it just ate too many batteries and I had to rewrite my programs every few months (being slow to replace the batteries). This program offers the full 42S functionality with near-identical form factor on my phone. The keys are responsive and the calculator is a pleasure to use. I also use free42 on the desktop (Windows and Linux), making for a seamless interface for all those small calculations. I guess the competition are "Andro11C calculator" (and other similar programs that are not free). But the biggest advantage of the original 11C was the extraordinary battery life -- quite irrelevant on the phone. Free42 offers more functionality and, most importantly, the display of the Y register. Use the program, and don't forget to donate something -- the author deserves a reward for this great program.

A most excellent app. The HP 41 compatible nature A most excellent app. The HP 41 compatible nature is excellent for many engineering tasks. The new display scaling/smoothing is nice for small displays. I've tried Droid48, and it's too buttony, and not licensed for work use. I'm enjoying the occasional program. Get QPI and FCTR (nice). Eventually you might need a manual, but if you know RPN then you'll get far.

Very good 42 emulator This is a very nice and capable implementation of the HP 42s which many HP calculator fans consider to be the best RPN programmable (pre-RPL) calculator HP ever made. The emulation is even better than the real thing in that it can save and load programs from files. And it's free software! Get the alternative Android skins from the developer's website, they look really good. Items for the wishlist: On my Nexus 4 the LOCAT function doesn't appear to work, and I find that the printer output is a bit small. But apparently these items are already on the TODO list, so I give it 5 stars nonetheless.

What's New

The "external storage" filesystem is no longer referred to by the hard-coded path /sdcard, but using the external storage directory name provided by the Environment. This should help prevent problems like exporting programs and then not being able to find them from the PC.

The file selection dialog will now append the file extension if the filename doesn't include it already.

Additional information

Updated

December 7, 2013

Size

328k

Installs

10,000 - 50,000

Current Version

1.4.77a

Requires Android

1.5 and up

Content Rating

Everyone

Contact Developer

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A fully featured scientific calculator which looks and operates like the real thing.

It is made for General engineering and field use.

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12. Saving function to PNG image file.

13. Text Color Selection of text.

14. Font size Selection (normal or large).

- menu key->'Setting'->'Font size'

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- Exponent, logarithms (ln, log)

- Trigonometric functions - radians, degrees & gradients

- Hyperbolic functions sinh, cosh, tanh, ...

- Inverse functions of trigonometric functions

- Permutations (nPr) & Combinations (nCr)

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Listen Read Device Only Added Installed ## Scientific Calculator

roaming squirrel

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Listen Read Device Only Added Installed A calculator with 10 computing modes in one application + a handy scientific reference facility - different modes allow: 1) basic arithmetic (both decimals and fractions), 2) scientific calculations, 3) hex, oct & bin format calculations, 4) graphing applications, 5) matrices, 6) complex numbers, 7) quick formulas (including the ability to create custom formulas), 8) quick conversions, 9) solving algebraic equations & 10) time calculations.

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* Highest Common Factor & Lowest Common Multiple

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* Conversion Functions - covers all common units for distance, area, volume, weight, density, speed, pressure, energy, power, frequency, magnetic flux density, dynamic viscosity, temperature, heat transfer coefficient, time, angles, data size, fuel efficiency & exchange rates

* Constants - a wide range of inbuilt constants listed in 4 categories:

1) Physical & Astronomical Constants - press to include into a calculation or long press for more information on the constant and its relationship to other constants

2) Periodic Table - a full listing of the periodic table - press to input an element's atomic mass into a calculation or long press for more information on the chosen element - the app also includes a clickable, pictorial representation of the periodic table

3) Solar System - press to input a planet's orbit distance into a calculation or long press for more information on the chosen planet

4) My Constants - a set of personal constants that can be added via the History

* Convert between hex, oct, bin & dec

* AND, OR, XOR, NOT, NAND, NOR & XNOR Functions

* Left Hand & Right Hand Shift

* Plotter with a table also available together with the graph

* Complex numbers in Cartesian, Polar or Euler Identity format

* Fractions Mode for general arithmetic functions including use of parentheses, squares, cubes and their roots

* 20 Memory Registers in each of the calculation modes

* A complete record of each calculation is stored in the calculation history, the result of which can be used in future calculations

An extensive help facility is available which also includes some useful scientific reference sections covering names in the metric system, useful mathematical formulas and a detailed listing of physical laws containing a brief description of each law.

A default screen layout is available for each function showing all buttons on one screen or, alternatively, all the functions are also available on a range of scrollable layouts which are more suitable for small screens - output can be set to scroll either vertically (the default) or horizontally as preferred – output font size can be increased or decreased by long pressing the + or - buttons

A full range of settings allow easy customisation - move to SD for 2.2+ users

Please email any questions that are not answered in the help section or any requests for bug fixes, changes or extensions regarding the functions of the calculator - glad to help wherever possible.

This is an ad-supported app - an ad-free paid version is also available for a nominal US$ 0.99 - please search for Scientific Calculator (adfree)

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