• Over 500 KB memory for storing functions, programs, and data.
• Pretty Print technology displays mathematical expressions as they appear in textbooks.
• QWERTY keyboard and large display; real-time rotation of 3-D surfaces.
• Electronically upgradable using flash technology.
• Input/output port and cable; also supports optional TI-GRAPH LINK. The screen is black because the brightness needs to be turned up. This happens when there are no batteries inside them. Please press the second button and the arrow up or down. Please repaet this until the desired brightness is achieved.

.com ---- .com Product Description With more power than most of us had in our PCs less than 20 years ago, the TI-92 Plus graphing calculator is the machine of choice for students and engineers both at the desk and on the go. It comes with over 500 KB of memory and software for working through algebra and other mathematic problems quickly and easily. With the TI Graph Link accessory (not included), you can connect to computers and even download software upgrades. Solve linear and nonlinear equations, use the Pretty Print feature to see equations in textbook format, and work with 3-D surface graphs in real time. The QWERTY keyboard is rugged and easy to use, the 128 x 240 screen is easy on the eyes, and the calculator comes with a durable shell to protect its face when you're traveling or in the field. Additional accessories can turn the TI-92 into a mobile data-collection station, but it's just as useful at home. Students beware: Some professors and teachers discourage, or even ban the use of calculators like the TI-92 in their classes, so make sure it's OK before you buy. Once you're set, the manual is clear and straightforward--you'll be programming in no time. Ultrageeks will love the assembly-language option, but the rest of us can get by just fine with the regular interface. The old timers might still cling to their slide rules, but anyone who needs a calculator for school or work can see why the Texas Instruments TI-92 is so popular: Its versatility, power, and portability give you the number-crunching power of a computer no matter where you are. --Rob Lightner Pros * Powerful mathematics software * Easily upgradable * Handles advanced math well * Easy to read and use Cons * Large size * Relatively high cost * May not be permitted for some classes or standardized tests From the Manufacturer --------------------- Bring the power of a computer lab to your mathematics classroom. With built-in geometry software and a powerful math engine, the TI-92 Plus is useful in all high school and college math classes. Enhanced with Flash technology, this handheld gives you the flexibility to add calculator software applications and additional functions beyond math and science, providing long-term value.