Programs for the TI-85.
This program assumes you have two points and will draw lines to those two points for you. So you might have something like "graph the line at points (3,2),(4,6)". The catch is this program is in a loop to allow for multiple lines to be drawn. Just hit 2nd and quit (or exit) to exit the program and then hit GRAPH to view the lines you made. This is also handy if you need to draw a line across an equaltion already in the grapher.
The TI-85s built in solver can solve these types of problems. This program just makes the data entry a little easier.
Ever get stuck trying to determine the absolute, relative, and percent error? This program is for you.
Convert a decimal number to binary and hex. I'm pretty sure I needed this for Discrete Math and I know I haven't used it since.
One of several Trig apps. This one displays how to find the cosecant as well as lets you plug the numbers in for the calculator to solve.
One of my first game programming books was for the Apple ][e. One of the cool BASIC programs in the book was this skiing game. For some reason, it was cool to punch into the computer and entertaining to play. I ported it over to the TI and added obstacles (see 2nd last menu option – by default they are off but you can easily turn them on). Just use the left/right arrow keys to direct your skier. It keeps track of your score and the highest score.
I'm pretty sure there's more productive ways to get rid of the axis and tick marks from within a program. One of my apps needed the axis removed and this program was the brute force result.
Well, it could be used as a clock, but its really setup as a timer right now. A few tweaks here and there and you should be able to use this as a clock. For one reason or another, I didn't finish this app all the way. Hit 2nd then ON to exit it. Modify the 350 at line 11 to suit your needs of you calculator (may require some fiddling).
Use this app to center your text on the TI (default is 40 characters across). Modify the 40 at line 10 to suit your calculator or even your computer. If you are creating an ASCII application on your PC, set it to 80.
This app attempts to calculate loan information. You will want to modify this one so it fits your needs. It doesn't have a way to input the interest rate. To change it, just modify this line: (FP)/(79/100)\->\MP and change the (79/100) to the desired interest rate.
This program I believe was used for Discrete Math. It calculates the decimal representation of a binary decimal number. I believe the TI-85 can do this natively, but this app was built to reduce data entry issues and reduce key presses to switch from DEC to BIN and then back. It asks for the length of the string as well which allows it to account for 0 place holders.
A very simple example of graph animation. A "ball" (really its just a line) goes back and forth.
Amuse your friends with this one. Ask a question out loud (or quietly if you are shy) and your TI will give you an answer. The name is misspelled on purpose.
