This page has many resources for Texas Instruments TI-89/TI-89 Titanium and TI-92 Plus/Voyage 200 calculators/computers (called the TI-68k family), including several math and utility packages and links to useful resources. This site also hosts E.W.'s Equation Writer page.

TI-89/V200/TI-92 Plus Information on a very good handheld Computer Algebra System (CAS).

TI-89 and TI-92+/V200 TI Online Store sections.

TI Knowledgebase Frequently asked questions.

TI Flash Studio v1.1 and TI-GCC v0.94  Software Development Kits for the TI-68k.

Master Program List (MPL)  A list of useful programs for math, science, and engineering.

Discussion Group  for the TI-68k.

TIGCC General and TIGCC/TIFS Math   Forums for discussing general and math programming in C.

PDF documents: (view using the free Adobe Reader)

TI-89/92+ Guidebook (for AMS versions 2.0x).

Module-based manual Newer, harder to use version of TI-68k manual.

 TI-68k vs HP49G+ benchmark (draft) A benchmark comparing functionality and performance.

 Bug List version 1.3 Beta A list of externally known bugs.

Tip List v10  An alternate location (hosted by TI).
(Note: The entire file is downloaded before viewing.)

Some recommended websites (many with downloadable software):

Calculator Forensics  Floating point trig function precision (exact result is 9°).

Orbit Mechanics Scott Campbell's tutorial, with programs.

DataMath A calculator museum, with history, images, and information.

FeeraLucent Artraze's programs: a beta 3D plotter, timing program, and benchmarking utility.

Glenn Fisher's page Z-transform, number theory, polynomials, summation, and more.

John Hanna's IView page Image converters from PC to TI format.

Selwyn Hollis' site  Calculus, linear algebra, differential equations, quadrature, and more.

Kevin Kofler's site  Includes his ChemiSlv, Gosper, and other math and utility programs.

Roberto Perez-Franco's site  Roberto's Symbulator; Lars' RPN, DiffEq, and Laplace; and more.

RSKey  Another calculator museum, with less depth but more variety.

Samuel Stearley's site  Includes YaPT (periodic table), Hail expression editor, and more.

Texas A&M University Math Club  Includes a Runge-Kutta solver and a Simplex program.

TI-92 Program Library by David Stoutemyer, creator of Derive.

Math routines and packages:

Utilities:

Experimental (beta) routines and packages:

Bug updates and notes for my programs:

• You can use nSeries() to find residues, by extracting the (dim(answer)-1)/2 th element from the list.
  To find residues about infinity, just use -Residue(1/z^2*f(1/z)) about z=0.
• To compute series about infinity to, say, order 5, use nSeries(f(1/q),q,0,5)|q=1/x (q is a temporary variable).
  In other words, replace the independent variable with 1/q, find the series about 0, then undo the x=1/q replacement.
  For example, to find an asymptotic expansion for sin(sin(1/x)), use nSeries(sin(sin(1/x))|x=1/z, z,0,5), then substitute z=1/x.
  Be sure to remove terms with small coefficients from the intermediate result, and remember that since this is an asymptotic
  expansion you don't want polynomial terms in the final result (if the limit of the original expression at infinity is finite).
• CSpecFn\Gamma(a,x) crashes with an "Address Error" for some values of a (thanks to Arnoud for bringing this bug to my notice).
• Timing() gives exact results when launched using [DIAMOND][ENTER] (thanks to Lionel Debroux for pointing out this bug).
• Most or all of my C programs currently do not check for free memory, so please make sure there is enough free RAM.
• For my math programs, I recommend these mode settings: Radian, Complex-Rectangular, Auto, Base-Dec (these are what I use).

eBooks: (use the TICT eBook reader to view)

A function I wrote for the TI-92 to find a particular solution for an ODE (in plain text format).

^*Note:  TI-92+ functions/programs (except some C/ASM programs) can be sent unmodified to the TI-89. TI-92 programs/functions may need to be modified to run on the TI-89/92+. To "unzip" the downloaded files, you will need an unzipping utility such as Winzip; after this, use TI Connect to send the files to your calculator.

^**This program has been written in C. Currently, the TI AMS does not allow using C programs in expressions (e.g. mycprgm(5)+2->myvar).
There is a patch called IPR that overcomes this serious limitation, but be sure to install Kevin Kofler's h220xtsr if you have a HW2 calculator.

"The task is not so much to see what no one has yet seen, but rather to think what no one has yet thought, about that which everyone sees." --- Erwin Schrödinger.

"Everything that the human race has done and thought is concerned with the satisfaction of deeply felt needs and the assuagement of pain... feeling and longing are the motive force behind all human endeavour and human creation." --- Albert Einstein.

"I am satisfied with the mystery of life's eternity and with a knowledge, a sense, of the marvelous structure of existence -- as well as the humble attempt to understand even a tiny portion of the Reason that manifests itself in Nature." --- Albert Einstein.

"Science has brought forth [the danger of nuclear weapons], but the real problem is in the minds and hearts of men." --- Albert Einstein.

"We have developed speed but we have shut ourselves in. Machinery that gives abundance has left us in want. Our knowledge has made us cynical, our cleverness hard and unkind. We think too much and feel too little. More than machinery, we need humanity. More than cleverness, we need kindness and gentleness. Without these qualities, life will be violent and all will be lost." --- Charles Chaplin, speech from 'The Great Dictator'.

Copyright © 1998-2005 Bhuvanesh Bhatt.

This work is licensed under a Creative Commons License. If you would like to build upon my work, please e-mail me. Please note that, depending on how busy I am, it may take me a while to reply; however, if you don't get a reply in a couple of weeks, please remind me.