Permitted for use on many state and standardized tests. Upgradeable with TI Connectivity Kit USB sold separately add new software, programs or games. Advanced statistics functions, including hypothesis testing and calculation of confidence intervals. Probability.Complex numbers. Financial functions such as time-value-of-money, cash flow calculations and amortization. Advanced graphing features including multiple graph styles. Equation solver. Supports Z80 assembly language programming. 24K user-available RAM and 160K user-available flash ROM memory. Adjustable contrast 8-line by 16-character display, 64 x 96 pixels.