@Pancakes Yes.
@Alpha Yes, but like pancake said, whirld doesn't support scripts. I like dynamic objects though. And also some effects, but not a lot like in Arena of Secrets or Delta's Dream World (I had the link to it but lost it I think, but the link probably doesn't even work)
"This is the calculator that I use, the TI-84 Plus. On the other hand the TI-89 comes with Preloaded with Official AP Calculus exam review questions and is slightly faster than the TI 84 Plus. You can use Google Product Search to find much lower prices at reputable stores than the the official TI price below. and I don't know about the SATs. I really like this calculator
An enhanced version of the TI-83 Plus, the new TI-84 Plus offers a built-in USB port, 3x the memory of the TI-83 Plus, many preloaded Apps, an improved display, and more! Because the new TI-84 Plus is 100% keystroke-for-keystroke compatible with the TI-83 Plus, integrating it into your classroom will be easy! With the TI-84 Plus, all students can now share their work by connecting their TI-84 Plus to any TI presentation tools for the whole class to see, fostering a collaborative learning environment.* Plus, a built-in USB port makes data transfer to your computer and between handhelds easier than ever.
*Capability available with a Presentation Link™ adapter (sold separately). Features:
* Preloaded Handheld Software Applications (Apps), including Cabri® Jr. * 3x the memory of the TI-83 Plus * Compatibility with TI presentation tools * A built-in USB port with cable * 2.5x the speed of the TI-83 Plus * High-contrast display * Graphs, Rectangular Functions * Graphs, Polar Equations * Graphs, Parametric Equations * Graphs, Differential Equations * Programming Subroutines * Hypothesis Testing * Confidence Interval Calculating * Hyperbolic Functions * Trig/Log Functions * Base Conversions & Math: Binary * Logical (Boolean) Operations * Simultaneous Equations * Calculus Operations * Matrices * Complex Numbers * Equation Editor * Equation Playback * Direct Algebraic Logic * Simple Scientific Functions * Variable Statistics: Two * TI Graph Link: Offers increased capacity and speed
Specifications:
* Display Window: 16 characters x 8 lines * Display Notation: Graphic * Storage Memory: 2MB * Interactive Zoom: 14 * Programming Steps/Storage: 1.1MB * I/O Port * USB Cable Included * Batteries: 4 AAA, included * Dimensions: 3-1/2" W x 7-3/8" D
If I were you I'd check out the description of the TI 89 as well.