UCALC  (DOS) is a graphing scientific calculator that can be used for simple arithmetic, or intricate scientific calculations. It supports many built-in functions, operators, numerical notations, and modes. It also supports user-defined functions and variables. It can evaluate expressions, solve equations, plot equations, perform numerical integrations, do summations, and more. Expressions such as the following are accepted: 63 - 5 + 4.75 (5.9-abs(2.8/5-3))^2 + sin( 3-(pi+3/4)*myfunction(a,b) ) solve 3*x^2+2*x-5 = 27 #b101010 and (#b10101 or #h1CC) * 2^5 plot sin(x)*x^2/10 plot3d sin(x)*z Features: MATH EXPRESSION EVALUATOR for simple or intricate operations Arithmetic, bitwise, and relational operators Decimal, hexadecimal, binary and octal notations Trig, hyperbolic, and many other common scientific functions Supports user defined variables & functions with multiple arguments Radian, degree, and gradient modes for trig functions High precision: 18 significant digits. +/-3.4E-4932 to +/-1.2E+4932 Equation solver, summation & sumtable, numerical integration FAST EQUATION PLOTTER Interactive menu with ZOOM, TRACE, COLOR, FILL, GRID, etc... Support for up to 16 supper-imposed multi-color user graphs Cartesian (rectangular), polar, and parametric user graphs 3D surface plotting with hidden line removal Data from another file can be plotted Adjustable precision & screen coordinate system Text can be typed anywhere on the graph screen VGA, EGA, MCGA, CGA, and Hercules modes (auto detection or select) Coordinates can be saved to a file Mouse support Online help with F1 Line editor with expression recall Expressions can be entered at the DOS command line Support for DOS redirection Adjustable FIX & DIG notation LOAD, WRITE, PRINT, SHELL, COLOR, and more Download UCALC 3.2 for DOS (only $25)