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The Sharp EL-5120 is a scientific programmable calculator. It has about 1 KB of total RAM available to the user, and has 4 basic operational modes: *Real mode: it is the basic operational mode for direcltly performing standard algebraic and statistical calculations, as well as evaluating user-defined functions and numerically integrating them. *NBase: can switch between Binary, Octal, Decimal and Hexadecimal base. Most functions from Real Mode don't work in this mode, but boolean operators for each numerical base are available. Hexadecimal base calculation are performed in 32 bits (8 digits) and there is support for signed operation, but Binary base is limited to 16 bits, though. *Solver: an interactive expression solver which can, in theory, numerically solve any equation versus any variable, using Newton's method. It may however fail to solve certain classes of equations depending on the expression format and starting values of the variables, so it is often necessary to rewrite the expression or experiment with initial values. *Program mode: Here the user can enter and execute short programs written in a language closely resembling a cut-down version of FORTRAN or BASIC. Programs can be made to operate in either Real or NBase mode, but not a mixture of both. == Main functions == * 3-line alphanumeric LCD display. * Alphanumeric keyboard with SHIFT and ALPHA keys. * All the standard trigonometrical functions (SIN, COS, TAN) as well as their inverse and hyperbolic versions. * All of the standard power raising, logarithmic etc. functions * Some functions like statistical operations and boolean logic functions are accessed via sub-menus, and thus they are not printed on any visible key. * 28 global user variables (A through Z plus ANS and θ), stored in CMOS memory. * Up to 9 local variables for each mode of operation and equation, solver or program file, with user defined names. Unlike the 28 global ones, using these local variables consumes user RAM. * 1 and 2 variables statistics, has only a simple linear regression analysis. * File "saving", "loading" and "deleting" from the small user RAM. Each mode can store its own "files", containing e.g. the last calculation or expression, a solver equation or a program plus any eventual local variables and the last ANS value. * Expression evaluator (in Real mode). * Numerical integration using Simpson's rule. * Numerical equation solver vs a specific variable using Newton's method. * Programs and solver equations can "exchange data" between them by appropriate use of the global variables, for solving more complex problems. * Adjustable contrast. * Uses one 3V CD2025 lithium battery. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sharp EL-5120」の詳細全文を読む スポンサード リンク
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