plus42
An Enhanced HP-42S Calculator Simulator (binary version)
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 made from 1988 until 1995 by
Hewlett-Packard. Free42 is a complete rewrite and contains no HP code
whatsoever.
Free42 Binary (free42bin) uses the PC's FPU; it represents numbers as IEEE-754
compatible double precision binary floating point, which consumes 8 bytes per
number, and gives an effective precision of nearly 16 decimal digits, with
exponents ranging from -308 to +308.
https://thomasokken.com/plus42/
Utility