15C HP Scientific Calculator

A member of Hewlett-Packard Voyager series of programmable calculators, it was produced between 1982 and 1989. The calculator is able to handle complex numbers and matrix operations.

Features:
• Excellent and robust emulation starting from the images of the original calculator
• Zoom In and Zoom Out Buttons
• Numerical integration root finder
• Complex numbers
• Matrix operations
• Hyperbolic and inverse hyperbolic trigonometric functions
• Probability (combinations and permutations)
• Factorial, change%, and absolute value
• RPN programmable random number generator
• Automatically save or restore settings