HP 42S Calculator RPN Scientific 1988 app for iPhone and iPad

This app(Hyper Process 42S Calculator RPN Scientific 1988) is simulator of 42s Calculator.

[42s Calculator is a programmable RPN Scientific hand held calculator introduced by Hewlett Packard in 1988. It has advanced functions suitable for applications in mathematics, linear algebra, statistical analysis, computer science and others.]

[HOW TO SHOW MAIN MENU]
Hold the screen to open MAIN MENU

Features:
●All basic scientific functions (including hyperbolic functions)
●Statistics (including curve fitting and forecasting)
Probability (including factorial, random numbers and Gamma function)
●Equation solver (root finder) that can solve for any variable in an equation
●Numerical integration for calculating definite integrals
●Matrix operations (including a Matrix Editor, dot product, cross product and solver for simultaneous linear equations)
●Complex numbers (including polar coordinates representation)
●Vector functions
●Named variables, registers and binary flags
●Graphic display with graphics functions and adjustable contrast
●Menus with submenus and mode settings (also custom programmable) that use the bottom line of the display to label the top row of keys
●Sound (piezoelectric beeper)
●Base conversion, integer arithmetic and binary and logic manipulation of numbers in Binary, octal, decimal and hexadecimal systems
●Catalogs for reviewing and using items stored in memory
●Programmability (keystroke programming with branching, loops, tests and flags)
●The ability to run programs written for the 41C series of calculators