So my numerical analysis class requires me perform iterations involving huge expressions into my strictly NON-graphical scientific calculator. It often happens so that my current calculator (CASIO fx-911ES PLUS) does not allow me to feed in it a expression which goes beyond its input memory. Therefore, I am looking for a NON-GRAPHICAL calculator with a substantial amount of input memory so as to allow me to feed huge hairy cumbersome expressions in it. I need some suggestions or help as to which calculators to look forward to fulfill my need. Thanks.