- Performs 335 advanced scientific functions. WriteView technology displays formulas as written in textbooks. DAL (Direct Algebraic Logic) makes it easy to enter formulas into the calculator. Three modes: Normal, Drill and Stat. Multi-line playback and editing function. Nine independent memories and four programmable keys. Power Source(s): Battery; Display Notation: Numeric; Number of Display Digits: 16; Display Characters x Display Lines: 16 x 4.