FX-7400G II Algebra FX series First made in the year 1999, these have flash memory which provides larger capacity than previous models, however due to the short lifespan of the original flash memory used, these calculators stop working after a few years. Casio has stated that this problem has been fixed. The Algebra FX 2.0 versions have symbolic algebra, while the FX 1.0 versions do not. There are community written tools for accessing the ROM-DOS operating system thus allowing C and Pascal compilers to be used. Models: Algebra FX 2.0, FX 1.0, Algebra FX 2.0 Plus, FX 1.0 Plus (French versions: Graph 100, Graph 100+) 9860 G/GII series First made in the year 2005, the 9860 models are much faster than previous models and can be programmed in C/C++ using the official software development kit. In 2009, the GII models were produced along with a corresponding OS update for the original 9860G, with new functions gcd/lcm/mod, random integer, units conversion, string functions, and new probability and inverse probability distributions available within programs. The 9860G OS update was not absolutely identical to an actual 9860GII model. The fx-9860G Slim and fx-9860GII have a backlight display. Models: fx-9860G, fx-9860G SD, fx-9860G Slim, fx-9860GII, fx-9860GII SD, fx-9750GII, fx-7400GII (French versions: Graph 85, Graph 85 SD, Graph 85 Slim, Graph 75, Graph 95, Graph 35+ USB, Graph 25+ Pro) Australia only: fx-9860G AU, fx-9860G AU Plus The fx-9750GII and fx-7400GII are low-budget versions with restricted OS functionality. Also, the fx-7400GII does not have a USB 1.1 port. The architecture of the 9750GII is similar to the 9860GII and therefore the former can be unofficially upgraded to the latter Operating System offering more features particularly pretty printed equations and Vector arithmetic. This is not supported by Casio. fx-CG Prizm series Announced for January 2011, these models have a high-resolution color display (396x224 screen with 384x216 pixels (21x8 characters) window with 216 colors), a USB 2.0 port, 16 MB of flash memory and a feature called Picture Plot. The Prizm is permitted on all major standardized tests including ACT, SAT, AP, GCSE and GCE examinations. The only known difference between the fx-CG10 and the fx-CG20 Prizm versions is that the fx-CG10 cannot open picture files that have been edited by users. SD card slot is no longer available. The processor is based on a custom Renesas SH4-A family SH7305 CPU. Additional features over fx-9860GII include: Real