The Calculators

This section is concerned with the TI-83 family of graphing calculators, which all use the same base processor chip — a Zilog Z80. There are five different calculators that are within this group: TI-83, TI-83+, TI-83+SE, TI-84+, TI-84+SE, TI-84+CSE, and TI-84+CE. Each of these calculators has their own features and unique qualities.

The TI-83 Calculator


The TI-83 is the oldest calculator in the group, being released back in 1996. It is designed to be an upgrade from the TI-82, featuring a sleeker case design, more memory (27K bytes of RAM), and a faster processor (6MHz). It kept some of the features the same as the TI-82, such as the screen size and being powered by 4 AAA batteries, to allow for backwards compatibility with the TI-82.

This means that while some of the TI-Basic commands on the TI-83 have a different syntax, at the core the TI-83 can execute the TI-82's TI-Basic programs. Some of the differences between TI-Basic for each calculator are how math is interpreted (implied multiplication versus regular multiplication) and commands that have an opening parentheses attached to the end of them (such as the trigonometry commands). When it comes to assembly programs, however, the TI-83 cannot execute the TI-82's assembly programs without some modification because of the processor upgrade.

The TI-83+ Calculator


The TI-83+ was released in 1999, and it was meant as an upgrade from the TI-83 with more memory and a faster processor. At the same time, it kept several features of the TI-83 to maintain backwards compatibility: the case design, the screen size (16x8 home screen and 96x64 graph screen), and the link port. There are some major differences, however.

The TI-83+ cannot run assembly programs made for the TI-83 because it uses a different format: there are three built-in commands, AsmPrgm, AsmComp( and Asm(, used for running assembly programs, while the TI-83 has no such commands. The TI-83 Plus uses a speedier 8MHz processor which is clocked at the same 6MHz as the TI-83.

The TI-83 comes with 24K bytes of available memory built-in, while the TI-83+ comes with 184K bytes of available memory: 24K bytes are RAM and 160K bytes are archive memory, or more commonly called "Flash" memory. Archive memory allows you to store data, programs, applications, or any other variables to a safe location where they cannot be edited or deleted inadvertently from a RAM crash. This creates a compatibility issue with TI-83 TI-Basic, however, because of the use of the Archive and UnArchive commands that are on the TI-83+.

The TI-83+SE Calculator


The TI-83+SE (short for Silver Edition) was the next calculator upgrade in the group. When it was released by TI in 2001, it became instantly popular because of its unique look and increased memory and speed. However, TI has since decided to stop production of it and focus on the TI-84+SE calculator instead. The TI-83+SE has now become somewhat of a collector's item.

After seeing the success of the TI-83 calculator series, TI decided to give their next TI-83 series calculator a unique look to set it apart from the other TI-83 calculators. The TI-83+SE calculator look consists of a transparent silver case with silver sparkles sprinkled throughout. What really made the calculator shine, though, was that the transparent case allowed you to see what the internals of the calculator looked like without even having to open up the calculator.

In addition to the unique look, TI also decided to upgrade the memory and speed. While maintaining almost complete backward compatibility, the TI-83+SE features 128K bytes of RAM and 1.5M bytes of archive memory. It should be noted, however, that only 24K bytes of RAM are available to TI-Basic programmers (you need to use assembly to access all 128K bytes). The TI-83+SE uses a 15MHz processor, but it can also be made to run at the 8MHz and 6MHz speeds through assembly.

The TI-84+ Calculator


The TI-84+ was released in 2004, and it was meant to be an upgrade of the TI-83+. The TI-84+ introduces a couple new things to the TI-83 calculator series: a built-in clock and a mini USB link port. The built-in clock can be used in TI-Basic by using the new clock commands that go with it, while the mini USB link port greatly increases the speed of linking the calculator to a computer.

The TI-84+ also improves upon the TI-83+ in terms of memory and speed: 24K bytes of RAM and 480K bytes of archive memory; and a 15MHz processor (the same one that the TI-83+SE has). The most obvious change that the TI-84+ brings is a completely new case design. Gone are the slightly rounded edges and appearance; in its place is an almost circular look from the front, with the edges smoothly flowing around to the back of the calculator.

The TI-84+SE Calculator


The TI-84+SE was released along with the TI-84+ in 2004, kind of like a TI-83 calculator series package upgrade. The TI-84+SE was meant to be an upgrade of the TI-83+SE, and it includes the same upgrades that the TI-84+ got. The two new innovations that the TI-84+SE introduces are: interchangeable faceplates and a kickstand; these things are basically optional add-ons for your calculator.

The interchangeable faceplate can be useful if you want to change the front look of your calculator. You simply purchase a different faceplate and swap it with the current faceplate. The calculator's initial faceplate is a light gray/silver. The kickstand is built into the calculator lid, and it allows you to set the calculator to four different viewing angles. Concerning memory and speed, the TI-84+SE has the same amount of memory and speed as the TI-83+SE.

The TI-84+CSE Calculator


Initially leaked in 2012, the TI-84+CSE was officially announced in early 2013. The calculator was the first in the TI-83/84 series to come with a color screen, hence the name Color Silver Edition. With the advent of color, several commands were added to utilize the new feature.

The calculator has the same body as its predecessor, the TI-84+/TI-84+SE. A rechargeable Li-ion battery powers the battery, which can be charged in a dock or through the USB port. On the back, the calculator no longer has a snap-in removable battery cover, but instead features a reset button and when pressed has the effect of clearing the RAM.

Upon its release, some users noticed the speed difference between the TI-84+CSE and other calculators. Because the calculator is powering the screen, the speed of the TI-84+CSE is less than its predecessors. Still, the TI-84+CSE brought color to the classroom, while remaining familiar to those who had used a calculator on the TI-83/84 line.

The TI-84+CSE also has a larger array with which the Output( command can be used, a 26(x) x 10(y) grid. There is also a toolbar at the top that shows the basic settings of the calculator. As for changes with the graph screen, TI has created a graph buffer that effectively makes the graph screen much harder to use for games.

The TI-84+CE Calculator


Announced and released in early 2015, the TI-84+CE seeks to improve the qualities of the TI-84+CSE. It is 30% lighter and 30% thinner than the TI-84+CSE. The body of the calculator has been changed to a slimmer design. While the calculator still has the USB port for charging and data transfers, it no longer has the I/O port. The TI-84+CE retains the same key map.

Addressing the concerns of the slow TI-84+CSE, the TI-84+CE is faster. The processor has been upgraded from the usual z80 to the faster ez80. In addition, it features more RAM than any previous TI-83/84 calculator.

Calculator Comparison

Model Processor RAM ROM Screen Size Link Port Clock Release Date
TI-83 6 MHz 27 KB None 96x64 I/O No 1996
TI-83+ 6 MHz 24 KB 160 KB 96x64 I/O No 1999
TI-83+SE 15 MHz 24 KB (128 KB) 1.5 MB 96x64 I/O No 2001
TI-84+ 15 MHz 24 KB 480 KB 96x64 I/O+USB Yes 2004
TI-84+SE 15 MHz 24 KB (128 KB) 1.5 MB 96x64 I/O+USB Yes 2004
TI-84+CSE 15 MHz 21 KB (128 KB) 3.5 MB 320x240 I/O+USB Yes 2013
TI-84+CE ~48 MHz 154 KB (256 KB) 4.0 MB 320x240 USB Yes 2015

Known ROM Versions

TI occasionally releases updates to the ROM version for each calculator, which either fix existing bugs, improve calculator performance, or add new commands and functionality. You can check the ROM version on your calculator by selecting the About option in the Memory menu, which is accessible by pressing 2nd MEM. See portability for a list of changes in functionality between the OS versions.

Model Known ROM Versions
TI-83 1.02, 1.03, 1.04, 1.06, 1.07, 1.08, 1.10
TI-83+ 1.03, 1.06, 1.08, 1.10, 1.12, 1.13, 1.14, 1.15, 1.16, 1.17, 1.18, 1.19
TI-83+SE 1.13, 1.14, 1.15, 1.16, 1.17, 1.18, 1.19
TI-84+ 2.21, 2.22, 2.30, 2.40, 2.41, 2.43, 2.53MP, 2.55MP
TI-84+SE 2.21, 2.22, 2.30, 2.40, 2.41, 2.43, 2.53MP, 2.55MP1
TI-Nspire (84+ Emulation) 2.42, 2.46, 2.48, 2.54MP, 2.56 MP
TI-84+CSE 4.0, 4.2
TI-84+CE 5.0, 5.0.1,,,

Pre-Loaded Applications

Except for the TI-83 which has no Flash ROM, all of the other TI-83 series of calculators come with some pre-loaded applications for users to use. Since most of the applications are rather limited in use and scope, not to mention that they each take up 16K bytes or more of memory, most people end up deleting them off of their calculator to allow them to fit more programs and games. If you want to put them back on your calculator again, you can find them all on TI's website.

Model Pre-Loaded Applications
TI-83+ Language Localization, Probability Simulation, Science Tools, StudyCards, Vernier EasyData
TI-83+SE CellSheet, GeoMaster, Language Localization, Organizer, Periodic Table, StudyCards
TI-84+ Cabri Jr., Conic Graphing, Inequality Graphing, Language Localization, LearningCheck, LogIn, Probability Simulation, Science Tools, StudyCards, TI CBL/CBR, TImeSpan, Topics in Algebra 1, Transformation Graphing, Vernier EasyData
TI-84+SE app4math, Area Formulas, Cabri Jr., Catalog Help, CellSheet, Conic Graphing, Fundamental Topics in Science, GeoMaster, Inequality Graphing, Language Localization, LearningCheck, LogIn, NoteFolio, Organizer, Periodic Table, Polynomial Root Finder and Simultaneous Equation Solver, Probability Simulation, Puzzle Pack, Science Tools, Start-Up Customization, StudyCards, TI CBL/CBR, TImeSpan, Topics in Algebra 1, Transformation Graphing, Vernier EasyData
TI-84+CSE App4Math, Polynomial Root Finder/Simultaneous Equation Solver, Vernier EasyData, Language Localization, Probability Simulation
TI-84+CE App4Math, Language Localization, Polynomial Root Finder/Simultaneous Equation Solver, Vernier EasyData

For the most up-to-date version of this command, see

Why TI-Basic?

TI-Basic History

Texas Instruments has included TI-Basic support with each graphing calculator (starting with the TI-81), and the TI-Basic language has evolved along with the calculators (adding new features and functionality).

With the release of the TI-84+/SE calculators, TI-Basic was enriched with time and date commands that use the new built-in clock, as well as some additional statistics commands.

TI-Basic is the built-in programming language of the TI graphing calculators. You can create TI-Basic programs on the computer using the Graph Link or TI Connect software, or on the calculator itself through the program editor (see the starter kit for more information).

Knowing TI-Basic is important because it is one of the main ways that people use their calculators; if you are unable to program in TI-Basic, you will not be able to effectively communicate with others concerning your calculator.

Advantages of TI-Basic

There are several advantages of programming your calculator in TI-Basic. First, and foremost, it is the most well known calculator programming language. With most high schools requiring TI graphing calculators for math and science classes, TI-Basic is often used by students to make small math or science programs. For many of these students, TI-Basic is the first programming language they have ever used.

Second, TI-Basic is extremely simple to learn. In TI-Basic, most of the commands are easily understood. The commands are written in plain English or easily comprehended abbreviations: Disp, Dec, etc. In addition, the commands are generally self-explanatory. For example, it is not very hard to recognize that the Pause command pauses a program.

Related to the simplicity of learning, the third advantage of TI-Basic is that it is the only language (so far) that can be programmed directly on the calculator. Assembly programs need to be written on a computer, and then converted into machine code with an assembler and several other programs. These programs are currently only available on computers.

The next advantage of TI-Basic is that it is very easy to do calculations in. Though TI-Basic can be used to write games as well, it's really useful for math programs. A math program in another language would probably have to call the same routines that TI-Basic uses anyway; this would be much more complicated, and wouldn't be an improvement in size or speed.

Lastly, if you mess up in TI-Basic (i.e., your program has an error), it just gives you an error message. If an assembly program has an error, however, the results wouldn't be as good. Depending on the severity of the error, you can cause your calculator's RAM to be cleared, or even leave your calculator in an endless loop, rendering it completely useless. TI-Basic does not have that problem, because no matter where you are in a TI-Basic program, you just have to press the ON key to stop execution.

Disadvantages of TI-Basic

TI-Basic does have some disadvantages. Its main disadvantage is its speed. Because TI-Basic is converted by the calculator into machine code before it is executed, it loses much of its speed. Doing anything involving calculations or graphics is quite slow in TI-Basic. Really, the speed of TI-Basic comes nowhere close to the speed of assembly. You just need to play an assembly game (such as Super Mario) to see the great difference in speed.

The other disadvantage of TI-Basic is that it is does not have low-level access to the calculator's hardware. While this is intentionally done to prevent potential misuse, it has the result of limiting the quality of TI-Basic programs. This is mainly a problem with input (the getKey command is limited to one key at a time) and graphics (the drawing functions are just simple pixels, lines, and circles).

The fact that the TI-Basic syntax is not very strict is also a disadvantage. Using TI-Basic-like optimizations in other programming languages, is not a very good idea. Optimize your calculator programs, but don't fall into bad programming habits!

For the most up-to-date version of this command, see

Using This Guide

Getting Additional Help

Most of the members of this wiki can be found on the forum, so you can post there with questions and get help with whatever you are working on or trying to learn.

In order to post on the forum, however, you need to create an account. This is an easy process, and should take no more than a couple minutes.

It is the goal of this site to eventually cover all information on TI-Basic programming for the TI-83 series of calculators. However, an excess of information can be overwhelming, so this page gives a suggested reading order (as well as necessary tidbits) so you don't get lost.

There are two alternatives for those who have just ventured into programming for these calculators. While you might want to just jump in, we have a tutorial that explains the basics of TI-Basic and another that answers basic TI-Basic questions.

The first, the TI-Basic Starter Kit, teaches TI-Basic without assuming any previous programming experience. In fact, the very first section explains how to create your first program. After reading this tutorial carefully, you should be more than ready to handle the rest of this site.

The second tutorial is the TI-Basic FAQ. As the name suggests, it is an attempt to answer the common TI-Basic questions that people ask. Many of the questions are related to each other, so it is recommended that you read through the whole list. If you have any questions that aren't mentioned on the list, or an answer doesn't help, please leave a post in the forums and somebody will try to help you.

Further Reading

At this point, you should be familiar with more than a few TI-Basic commands. It might be a good idea to just jump into the command index and click on commands that sound interesting — you can really improve your TI-Basic knowledge that way. Or, select a category from the Commands menu in the top navigation, and read about commands in a more general way.

Looking at code examples is also a good way to learn. Games and Programs are a good place to find such example code. See the Routines page for several short routines to get simple things done in the best possible way.

Use the glossary whenever you come across a term you're not familiar with. If it's not there or the entry doesn't help, drop a note in the forums and (usually within a day) helpful people will explain it and hopefully improve the glossary as well, so no one else has the same trouble.

The pages in the Reference section of the top menu are probably not ones you'd read for fun. Take a look at them at any time to see what they're all about, and then check back when you need to know more.

Writing a Program

Of course, the best way to learn these topics is to come up with a project of yourself (check the project-ideas page if you have no ideas), and go through the steps as you're doing it:

  1. Look at Planning when you're thinking about how to approach the problem.
  2. Consider Commenting Code and Code Conventions when you're writing it.
  3. If bugs arise (and they most likely will), see the section on Debugging.
  4. When the program works, add Setup and Cleanup to it, and check the sections on Usability and Portability.
  5. If the program is too slow (and maybe even when it's not), see Optimization and Code Timings for ways to improve it.
  6. Finally, see Releasing Your Program for how to earn TI-Basic programming fame by making the program public.

These are listed in the Design section of the side navigation menu.

Advanced Topics

The Techniques section in the side navigation menu discusses some advanced issues in TI-83 programming. You should probably have a good grasp of programming before venturing into these pages, but they are worth reading. Give them a glance to see how much you can understand.

Each technique is mostly a stand-alone page. Here are the relative difficulties of the pages:


  • Friendly Windows — makes using the graph screen commands much easier.
  • Piecewise Expressions — very important to programmers.
  • Saving Games — almost as easy as just storing to a variable.
  • Highscores — an extension of saving, using a string for names and a list for scores.
  • Animation — adds some visual pop or pizazz to your programs.


  • Validation — how to ensure user input satisfies your requirements.
  • Making Maps — how you store the contents of the screen to a variable.
  • Movement in Maps — adds user interaction to programs.
  • Custom Text Input — useful when you want to get input on the graph screen.
  • Custom Menus — allows the user to choose among different options.


  • Graphics — different ways to make graphics and sprites.
  • Compression — if you wanted, you could get into some heavy theory with this.
  • Self-Modifying Code — code that changes itself while it is executing.
  • Subprograms — calling one program from another, including external and internal programs.
  • Assembly — you can make much better programs, but they are larger and more complicated.

For the most up-to-date version of this command, see

Frequently Asked Questions (FAQ)

This FAQ is an attempt to answer the common TI-Basic related questions that people ask. Many of the questions are related to each other, so it is recommended that you read through the whole list. If you have any questions that aren't mentioned on the list, please post them in the forum or leave a comment at the bottom of the page.


Q: Is TI-Basic easy to learn?
A: Yes! TI-Basic has the majority of the standard features and functionality that you find in other BASIC programming language variants (i.e., things like user input and variables are very similar), so if you can learn those languages, TI-Basic should be no problem. If TI-Basic is your first exposure to programming, it will require some work to learn, but it is definitely worth it because TI-Basic is a fun language to use.

Q: How do I learn TI-Basic?
A: The best way to learn TI-Basic is to download a copy of the manual, and start making small, sample programs to try out the different TI-Basic commands. Once you feel comfortable with the commands, you can start putting them together to create larger programs. After that, you should move on to learning the more advanced design concepts and techniques that are part of TI-Basic.

Q: Where can I get information on TI-Basic?
A: The wiki you are currently on has the largest collection of TI-Basic information available, including commands, design concepts, techniques, and experimentation. The downloads page has a comprehensive list of TI-Basic tutorials from elsewhere on the Internet, as well as some of the different tools and utilities.

Q: Do you have a tutorial about [subject]?
A: The best way to find out is to use the search box. If you don't find what you are looking for, leave a comment in the forum and one of us will try to help you. We won't guarantee that you will find everything on this wiki that you are looking for, since it is a constant work in progress and there are simply too many topics to cover. If you would like to make a suggestion for a new tutorial, you can add it to the wiki to-do list.

Q: Some of the tutorials appear to be unfinished. Why is this?
A: Since this is a wiki, and anyone can contribute, our policy is that we will post any legitimate tutorial that contains some useful information. Even if the person who started the tutorial doesn't finish it, there is a good likelihood that someone else will stumble upon it, and can improve or add on to it until it is finished. If you ever see a tutorial that could be improved in some way, we encourage you to just go ahead and change it.

Q: Where did the TI-Basic name come from?
A: Back when the language was growing in popularity and use, people wanted a simple name to refer to it that was easy to remember and told you what it was. Because it is the built-in programming language of the TI graphing calculators, and it is a variant of BASIC, TI-Basic is what they called it. You should note that the name is unofficial, as TI has never actually given it a name (for example, try searching for TI-Basic in the calculator manual; you won't find it).

Q: I've seen TI-Basic spelled with all uppercase (TI-BASIC) and with mixed case (TI-Basic), but what is the correct way to spell it?
A: Truthfully, there is no one correct way to spell it. It is just a personal preference. On this wiki, however, you will probably notice that we spell TI-Basic with mixed case. The primary reason for that decision is because it is easier to read (all caps aren't very reader-friendly).

Q: What languages do the TI calculators support?
A: The TI-83+ and TI-84+ support several different languages, including: French, German, Italian, Spanish, Portuguese, Dutch, Danish, Finnish, Norwegian, Swedish, Hungarian, and Polish. You just need to download a language localization application to install the respective language on your calculator. The applications can be found on the application page on TI's site.

Q: What calculators support TI-Basic?
A: All of the TI graphing calculators have TI-Basic support built-in. Of course, the calculators each have their own TI-Basic variant (see next question).

Q: What's the difference between TI-83 Basic and 68K TI-Basic?
A: Simply put, a whole lot. TI-83 Basic lacks all sorts of things that 68K TI-Basic has, including indirection, local variables and functions, advanced picture manipulation, text in matrices, and so on. It's a shame, too, because these things are extremely useful, and make TI-Basic that much richer of a language.

Q: Is there a place where I can interact with other TI-Basic programmers?
A: Yes. There is a fairly active forum available on this site where you can ask questions, get program feedback, share ideas, or whatever else you want to talk about. Some other active forums are CodeWalrus, Omnimaga, and Cemetech.


Q: Where can I find TI-Basic games and programs to download?
A: While has the largest collection of TI-Basic programs, most of the TI-Basic programs are of subpar quality, featuring crappy coding, gameplay, and graphics. If you are looking for quality TI-Basic programs, your best bet is to check out the programs on the showcases page.

Q: I don't want to buy the Graph Link cable. Can't I just type in the games by hand?
A: Yes, you can type in the games. All you need to do is download the Graph Link or TI-Connect software created by TI. You then start up the program, and open your game in the editor. If you don't like the idea of downloading an application, an alternative option is to view the games online using the SourceCoder application.

Q: I have a Graph Link cable, and want to send a game to my calculator. How do I do that?
A: Assuming you already have either the Graph Link or TI-Connect software (see previous question), you simply start up the software, click send to open the send menu, find your desired game, and then click transfer to send the game to your calculator. Note that if a game has several files that go with it (such as pictures and subprograms), you need to send those files with the game in order for it to work correctly.

Q: What is an emulator?
A: An emulator allows you to run a virtual form of your calculator on your computer, which is very convenient when you want to make quick changes to programs, or do any debugging or optimizing. There are several emulators available for you to use, so you should just experiment to see which one you prefer.

Q: I downloaded an emulator for my calculator, but it won't work because it says it needs a ROM image. What is that?
A: A ROM image is simply an instance of your calculator, which tells the emulator that you own your calculator. It is primarily used as a safeguard because only one person is supposed to be using any one ROM image. To download the ROM image to your computer, you just link your calculator to your computer, and then the emulator should be able to download the ROM image off of it.

Q: I have an awesome idea for a game, but I don't know how to program. Can you program it for me?
A: While we would like to help you program your game, we each have our own projects that we're working on and other real-world things (like school and a job) that occupy our time, so we aren't able to program your game for you. At the same time, if you have a specific TI-Basic programming question that you need help with, we'd be happy to help you. Even better than us programming your game, though, is you programming it yourself (see next question).

Q: What do I need to make games?
A: The main things you need to make games are your TI calculator and calculator manual. Before you actually implement a game, however, you should plan it out. This involves coming up with the idea for the game, and working out the many details of the game: graphics, gameplay, menus, and so on. Once you have all of those things figured out, you just need to put them into action.

Q: What is a good tutorial for making games?
A: Unfortunately, there really is no comprehensive game tutorial available. There are several game techniques covered on this wiki, however, such as animation, custom menus, saving, highscores, maps, and movement.

Q: Can I use a routine from this wiki in my game?
A: Yes! In fact, we encourage it. All of the routines on this site are designed to be as optimized and efficient as possible, so that readers learn the best way to program.

Q: Can I use sprites from other games in my own game?
A: The general consensus among the calculator programming community is that using somebody else's graphics in your game is fine, as long as you get their permission to do so. However, if you don't plan on releasing your game to the community, but instead just keeping it to yourself and your friends, then it doesn't really matter.


Q: How do I draw graphics?
A: You need to use the graph screen commands to draw graphics. There are several commands available, including points, pixels, lines, circles, and text. The one caveat you need to be aware of when drawing graphics is that the graph screen settings affect how some of the commands show up. See the respective command pages for more information.

Q: I've tried using the graphics commands, but they are too slow for my game. Is there a way to get better graphics?
A: In fact, there is. You can use one of the assembly libraries that is available. In particular, the best two assembly libraries for graphics are Omnicalc and xLIB. You can use them to create complex sprites, or any of the other advanced graphics that you see in TI-Basic programs.

Q: Can I do [task] in TI-Basic?
A: While it's possible to do almost anything in TI-Basic, whether it looks nice and runs at a decent speed is a different matter. If you have thoroughly planned your program and made it as optimized as possible, and your program still takes a minute to load and there's a five second lag after each key press, that's a good indicator that you should probably use Assembly instead. At the same time, you should always strive to push the boundaries of TI-Basic.

Q: How do I convert a number to a string and vice versa?
A: Converting a string to a number is actually very easy, and involves simply using the expr( command. Going the other way, however, is much more complicated because there is no built-in command to do it. What you need to use instead is a small number-to-string routine that involves using the LinReg(ax+b) command in an unorthodox way.

Q: What's the difference between setting a variable to zero and using the DelVar command?
A: When you set a variable to zero, you simply make its value zero. When you use the DelVar command on a variable, you actually delete the variable from memory. For letter variables, the next time the variable is used it is set to zero. DelVar also has some optimization capabilities associated with using it.

Q: How do I un/archive programs from within a program?
A: While the Archive and UnArchive commands would seem like the right commands to use, they actually don't work with programs from inside the program editor — interestingly enough, though, they do work with programs on the home screen outside of the program editor. What you need to use instead is an assembly program, such as Celtic.

Q: I want my program to be run when a person turns on their calculator. Is there a way to do that?
A: Not in TI-Basic, but you can use a Flash application to do that. TI created a Start-Up Customization application which will allow you to run a specific program, application or show a picture on the calculator screen each time the calculator is turned on.

Q: My program is extremely large. Is there a way to manage/condense the code better?
A: Subprograms and optimization are your friends :D

Q: Are there any undocumented features (Easter eggs) in TI-Basic?
A: Of course. Probably the most well-known undocumented feature is large text on the graph screen, which is achieved by placing a -1 at the beginning of the Text( command. Another cool undocumented feature which was recently discovered is the ability to draw circles significantly faster by placing a list with an imaginary i after the last argument. Besides those two Easter eggs, the TI-Basic community has made great strides in understanding TI-Basic and its many different facets.

Q: How do you disable the ON key?
A: Unfortunately, you can't. You need to use assembly to disable the ON key.

Q: How do I hide the code of my TI-Basic program?
A: While you can edit-lock a program and employ some other protection mechanisms, that only really prevents novice calculator users from getting access to your code. Anybody who knows what they are doing will have no problem bypassing your program protection.

Q: Where do you get the lowercase letters?
A: Lowercase letters aren't available by default, so you need to use an assembly program to turn on the lowercase flag that the calculator uses for enabling lowercase letters. You then just press Alpha twice to switch to lowercase mode. A good substitute for lowercase letters is the statistics variables, accessible by pressing VARS and then scrolling down to Statistics. Please note that while lowercase letters look nice, they each take up two bytes of memory, instead of the one byte that uppercase letters use.


Q: I think some of the routines on this wiki have errors in them, because they didn't work for me. Could you please correct them?
A: We have strived to make sure that all of the routines on this site work correctly and without problems. However, if you are 100% sure that you entered the routine correctly into your calculator, please leave a comment on the page using the comment function at the bottom of the page. Somebody will then be able to correct the routine so that it won't cause anybody else any problems.

Q: I downloaded a program from the Internet, but it has a .8xg extension instead of the typical .8xp extension. What is that, and how do I get it work?
A: The .8xg means that it is a group file (compared to the .8xp for programs), which you must ungroup in order to use. A group file contains one or more files, which can consist of whatever you want (programs, pictures, variables, or whatever else). The main reason that people group their programs is so that all of the program files are in one file, rather than having to remember lots of separate files; it's a matter of convenience.

Q: I found a TI-Basic program on the Internet, and typed it into my calculator. Why does the program not work?
A: While TI-Basic commands and functions look like they are made up of individual characters that you can type in, they are actually tokens that must be obtained by going to the relevant menu or pressing a key. Depending on the size of the program, it might be better to simply download the entire program to your calculator, instead of manually entering it in.

Q: I was playing a TI-Basic game and my calculator suddenly shut off. When I turned it back on, my memory was erased. What happened?
A: Your game had a glitch of some kind, and it caused the calculator to crash. This is usually caused by Assembly programs, as the majority of TI-Basic errors are caught by the calculator. You don't have to worry very much about TI-Basic crashes because they don't do any real permanent damage to the calculator, but because it is very annoying to have to replace all of your programs after your RAM is cleared, you should always store any important files in the archive.

Q: When I tried to run my TI-Basic program, I got this error message. What does it mean?
A: TI-Basic has a built-in error menu, which displays a respective error message based on the error that occurred. If the program is not edit-locked, then it will have a Goto option, which will take you to the point in the code where the error is. There's actually a whole list of error messages that you can receive at any one time, so you should just go down the list and try to see what you did to cause the error.

Q: I downloaded a TI-83 TI-Basic program, and tried to run it on my TI-84+SE calculator. It looked like it should work, but it doesn't. How come?
A: The majority of TI-83 TI-Basic programs will work on the TI-83+ and TI-84+ calculators, and likewise the majority of TI-83+ and TI-84+ TI-Basic programs will work on the TI-83. However, if a program uses either Assembly (Assembly must be compiled for the specific calculator in order to work) or any of the new TI-Basic commands/functions that TI added, then the program will not work on another calculator. See program portability for more information.

Q: After I finished running a TI-Basic game, my screen was split in two between the home screen and the graph screen. On top of that, the axes on the graph screen were gone. How do I get my calculator back to normal?
A: Unfortunately for you, the person who programmed the game didn't do a good job of cleaning up after their program, so you have to do that yourself. The calculator has several different settings that you can change to make it look however you want. In this case, you want the screen to just show the full home screen, so the appropriate command would be Full. Turning the axes back on can be accomplished by using the AxesOn command.


Q: What is assembly?
A: Assembly is the other primary programming language available for the TI-83 series of calculators, and it is a low-level language programmed in the calculator's own machine language.

Q: How does TI-Basic compare to assembly?
A: TI-Basic is much easier to learn and program in, but it is rather slow because it is an interpreted language. This not only affects getting user input, but also displaying text and graphics on the screen. Assembly on the other hand, is much harder to learn, but allows you to make all sorts of complex games and programs that look nice and run at a decent speed.

Q: Is it possible to convert TI-Basic to assembly?
A: No, it is not. There are currently no working programs available that will convert TI-Basic to assembly (note: I say working because people have tried creating TI-Basic to assembly converters, but nobody has completed one yet), so the only way you can convert a TI-Basic program to assembly is by learning assembly and porting the program yourself. You could also try asking an assembly programmer to port it for you, but most people won't do that unless the program is pretty small.

Q: I want to use an assembly program with my TI-Basic program, but I can't figure out how to use it. Can you help me?
A: Unfortunately, we really can't do much for you. What we recommend is that you contact the author of the assembly program and ask them for help. They wrote the program, so naturally they should be able to answer any questions that you have.

Q: When I tried to run a program from the program menu, it gave me a ERR:SYNTAX error with no Goto option. Why would it do that?
A: This means that you tried to run an assembly program. Most assembly programs are run from an assembly shell, such as MirageOS or Ion, but there are some assembly programs that you can run just using the Asm( command. These are commonly called nostub.

Q: Why would I want to run my TI-Basic program from an assembly shell?
A: Most people have assembly games on their calculator, which require an assembly shell to run, so they get accustomed to running their programs through a shell. In addition, they like being able to run all their games in a shell, including their TI-Basic games, so they don't have to exit the shell. Truthfully, though, there is really no advantage to running a TI-Basic program from a shell. It's just a personal preference.

Q: How do I run my TI-Basic program from an assembly shell?
A: The standard way to get a TI-Basic program to appear in an assembly shell is to add a special header to the beginning of the program. This header consists of a colon (:), and then you you can add an optional program description that will be displayed together with your program in the shell.

::"Program name  // note the two colons
: // program code

DoorsCS also has support for a custom icon, which needs to be stored in hexadecimal format. You should look at the documentation for DoorsCS to see how to use it.

For the most up-to-date version of this command, see

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