Wabbitemu TI Calculator Emulator

Wabbitemu TI Calculator Emulator

Developed By Spencer Putt, Chris Shappell, and James Montelongo

For Windows and Mac OS X and Android

From the project site:

  • Wabbitemu – An accurate emulator/debugger for the TI-73, TI-81, TI-82, TI-83, TI-83+(SE), TI-84+(SE), TI-84+CSE, TI-85, and TI-86
  • SPASM – The fastest Z80 assembler with extra features supporting TI calculator development
  • Wabbitcode – An integrated development environment with auto-complete, syntax-highlighting, and comprehensive source-level debugging

Available on the Google Play Store

Wabbitemu creates a Texas Instruments graphing calculator right on your Android device. Wabbitemu supports the TI-73, TI-81, TI-82, TI-83, TI-83 Plus, TI-83 Plus Silver Edition, TI-84 Plus, TI-84 Plus Silver Edition, TI-85, and TI-86. Fast and convenient, Wabbitemu allows you to always have your trusty calculator with you. Because Wabbitemu is an emulator, the calculator it creates will act exactly like the real thing.
Wabbitemu, like all emulators, requires a ROM image. Wabbitemu includes an easy to use setup wizard that will help you create a ROM image for your TI.

If you need to make a ROM, you can download it from your calculator.  If you need help try clicking on appropriate link below:



Excel: Primitive Bar Graph and Roman Numerals

Excel has a repeat function called REPT that will repeat a text character any number of times.  It’s format is REPT(TEXT, Value) where Value is the number of times that TEXT is repeated.  You can use “i”, “o”, “-“, or any other letters/symbols as your text and do a primative bar graph.  You can also your numbers to roman numerals if they are less than 4000 by using the ROMAN function.  The example table below shows three columns A, B, and C.  Row 7 shows the formulae starting with cell A7.  The rest of the rows show values if they formulae are copied down.

7 =Repeat(“i”,A7) =Roman(A7)
8 iiiiiiii VIII
9 iiiiiiiii IX
10 iiiiiiiiii X
11 iiiiiiiiiii XI

Solve Differential Equations with Wolfram Alpha

Wolfram Alpha now solves differential equations with step-by-step solutions!  They describe the new feature accordingly:

Wolfram|Alpha has become well-known for its ability to perform step-by-step math in a variety of areas. Today we’re pleased to introduce a new member to this family: step-by-step differential equations. Differential equations are fundamental to many fields, with applications such as describing spring-mass systems and circuits and modeling control systems.

From basic separable equations to solving with Laplace transforms, Wolfram|Alpha is a great way to guide yourself through a tough differential equation problem.

See examples and more on the Wolfram Alpha Blog.

Calculator to Estimate Time to Freezing for Water in an Insulated Pipe

The Whole Building Design Guide (www.wbdg.org) has updated their online calculator to estimate time to freezing for water in an insulated pipe.

Reference: 2009 ASHRAE HoF, Chapter 23, Equation 1 (pg 23.4)

This calculator estimates the time for a long, water-filled pipe or tube (with no flow) to reach the freezing temperature.

Via [Mechanical Insulation Design Guide – Estimate Time to Freezing for Water in an Insulated Pipe | Whole Building Design Guide.]

How to Apply Notional Loads in RISA-3D

RISA News has published an article about automating the application of notional loads to a RISA-3D model:

In RISA-3D you can automatically apply notional loads to your structure to comply with your steel code (such as AISC 360). Notional loads take into account a building’s actual out-of-plumbness by adding de-stabilizing lateral loads. The AISC 360 recommends either 0.2% or 0.3% of the vertical loads be applied at each floor level.

You can quickly add these loads to your model by going to the Insert menu and selecting Notional Loads.

via How to Apply Notional Loads in RISA-3D « RISA News.

Andie Graph


Here’s a great TI emulator for your Android device.  You will have to download your own ROM, but it works great.

Andie GraphGet a TI-82, TI-83, TI-85, AND TI-86 emulator for your phone!ROM NOT INCLUDED. Due to a request from TI, this app will NOT WORK until you EXTRACT YOUR OWN ROM. See http://supware.net/roms for details. This is similar to other emulators on the market: GameBoid, SNESoid, GBAEmulator, NESoid, psx4droid, etc The TI-8X series of calculators work great as standalone calculators, showing 8 lines of history, using standard mathematical notation.

via Andie Graph | supware.net.

Microsoft Mathematics 4.0

Microsoft Mathematics 3D graph
3D graph

Microsoft Mathematics 4.0 is a free mathematics program from Microsoft (if you couldn’t already tell that from the name) for Windows.  It is definitely a better upgrade to the standard windows calculator, and keeps a notebook of calculations/graphs.  It is more geared toward students, but can be useful for a general graphing calculator for anyone.  It can also be used with a tablet computer and stylus to accept written input.

Microsoft Mathematics provides a graphing calculator that plots in 2D and 3D, step-by-step equation solving, and useful tools to help students with math and science studies.

Microsoft Mathematics provides a set of mathematical tools that help students get school work done quickly and easily. With Microsoft Mathematics, students can learn to solve equations step-by-step while gaining a better understanding of fundamental concepts in pre-algebra, algebra, trigonometry, physics, chemistry, and calculus. 

Microsoft Mathematics includes a full-featured graphing calculator that’s designed to work just like a handheld calculator. Additional math tools help you evaluate triangles, convert from one system of units to another, and solve systems of equations.

To download from Microsoft:



GraphCalc The Ultimate Windows 2D/3D Graphing Calculator Software

This week, The Engineering Zone will feature calculator applications.

One of my Favorite PC calculators is GraphCalc (also available for Linux).  It is fast, easy, and you can use your number pad for input.  Even though it was last updated in 2003, it still works great on newer computers with Win7.

GraphCalc is ready to use out of the box. Don’t bother reading the documentation. Just start the program and you’ll see how easy it is to use.

Have a look at some screen shots of GraphCalc

This software is free and open source, so you can use it everywhere.  You can even export the 3d plots to DXF files.  These files can be imported into other programs.  This is convenient for surfaces that can be defined by a mathematical equation.

GraphCalc The Ultimate Windows 2D/3D Graphing Calculator Software.

Wolfram|Alpha – Intro

Wolfram|Alpha computational knowledge engine

Wolfram|Alpha is becoming a more valuable tool for engineers practically every day.  If you haven’t used it before, you should definitely check it out.  Their goals are summarized on their info page:


Wolfram|Alpha’s long-term goal is to make all systematic knowledge immediately computable and accessible to everyone.

We aim to collect and curate all objective data; implement every known model, method, and algorithm; and make it possible to compute whatever can be computed about anything. Our goal is to build on the achievements of science and other systematizations of knowledge to provide a single source that can be relied on by everyone for definitive answers to factual queries.

Wolfram|Alpha aims to bring expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.

Our goal is to accept completely free-form input, and to serve as a knowledge engine that generates powerful results and presents them with maximum clarity.

Wolfram|Alpha is an ambitious, long-term intellectual endeavor that we intend will deliver increasing capabilities over the years and decades to come.

With a world-class team and participation from top outside experts in countless fields, our goal is to create something that will stand as a major milestone of 21st century intellectual achievement.

You can do a lot with it.  It can definitely serve as a quick replacement when you need to consult an infrequently-used table for some data.  What is the bulk density of sand?  Need to know the coefficient of thermal expansion for Copper?  What about the general properties of elemental Silicon?  Need to solve some engineering problems?  These examples only scratch the surface of the large number of topics that Wolfram|Alpha covers.