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About the application:

Plus42 is an advanced scientific programmable calculator, based on Free42. Free42, in turn, is a complete re-implementation of the HP-42S scientific programmable RPN calculator, which was created from 1988 until 1995 by Hewlett-Packard. Free42 is a complete rewrite and includes no HP code whatsoever. Plus42 builds on Free42 and adds: Algebraic expressions modeled after those used on the HP-27S and HP-17B/19B; attached troops and unit conversions modeled after those used on the HP-48/49/50 series; directories for more organized storage of tools and variables; a larger display, with 8 rows and 22 columns (131x64 pixels) by default, which the player may resize at will; time value of cash and amortization schedules; and two-dimensional plotting of functions, with ability to zoom and pan, and search integrals and roots from points in the plot.