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Casio fx-991EX Classwiz for High School Students: Getling, David: 9781548247102: Amazon.com: Books
Got ahold of a Casio fx-991ex and CG-50 to match my Classpad II. I'm really impressed with them but there is something about the fx-991ex... (see comments) : r/calculators
Eddie's Math and Calculator Blog: Casio fx-991EX Classwiz Review
Casio fx-991EX classWiz user manual and commands.
My FX-991EX seems to be stuck. It's not taking any inputs and not responding to reset button. : r/calculators