Casio FX-991ES

403 Functions / Full DOT Matrix Natural Textbook Display / Plastic Keys
Integration / Differential
Equation calculation
Matrix calculations / Vector calculations

Complex number calculation
CALC function / SOLVE function
Base-n calculation

SPECIFICATIONS/FEATURES:
Fraction calculation
Combination and Permutation
Logarithm log
List-based STAT data editor

Standard deviation
Paired-variable statistics regression analysis
Logical operations
Table function
40 scientific constants
40 metric conversions (20 conversion pairs)
9 variable memories
Comes with new slide on hard case