Getting Started with Casio Classwiz FX-991EX FX-87DEX FX-570EX Calculator - YouTube
Fooling the CASIO ClassWiz fx-991LA X
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