RAM

The normal memory space on the calculator, as opposed to the archive that calculators with Flash ROM have. Is erased when memory is reset or when all battery power is lost. A lithium watch battery is used to retain RAM while the other batteries are changed.

TI-89 Dummies

Quotable Quotes:

"The only dummies are those who do not make use of their Dummies books. They are all well written by knowledgable professionals who have a sense of humor."

"I think that these are great books and you should get it right now if you own a Graphing Calculator."