Older calculators may not have the same functions as some of the newer models. Rather than simply replacing your calculator, you can enhance its abilities with user-programmed applications. These graphing calculator programs range from basic games and conversion tools to advanced mathematic applications intended to. And now for dessert: Graph89 (Playboard) Graph89 (Play Store). You can also play chess, a Zx Spectrum emulator, and even Link's Awakening. The TI-89 is programmed, and can be reprogrammed, in a languaged known as TI-BASIC, the BASIC equivalent for calculators. Two software kits for the programming language called C are available for purchase. How to Find Higher Math Functions on the TI-89 Graphing Calculator. Of course, your TI-89 graphing calculator helps you with higher math functions thats part of the reason you bought it. However, you might need help finding everything. You bet. The app itself is still in alpha, but it works like a charm. Observe: Excellent. Let's see if TI finds a reason to have Graph89 taken down this time. Until then - hurry up and download it before it's too late. Special Keys on the TI-89 Graphing Calculator. The TI-89 graphing calculator has so many functions, you may have trouble locating them all. But if youre looking for theta or infinity (and who isnt, right? look no further than the following list, which shows you where. The calculator also has a 2 MB flash memory which, when combined with the RAM, allow the user to store expressions, variables, programs, tables, text files, lists, and all sorts of other data in the device.