The most popular models include the fx-9750GII, the fx-9750GIII, and the PRIZM fx-CG50 line of calculators. Compared to Texas Instruments models, Casio calculators are generally cheaper.

Even the makers of humble graphing calculators can't resist a scrap. Casio is now throwing down the gauntlet, announcing that its fx-CP400 will arrive shortly after rival TI's color-screened TI-84+.

It helps that the Casio fx-CG50 is, itself, a pretty beefy calculator with 61kb of RAM memory, but this might be one of the more versatile Doom ports we’ve seen put on such a calculator (and we ...