free42-dec
An HP-42S Calculator Simulator (decimal version)
Free42 is a re-implementation of the HP-42S Scientific Programmable Calculator
and HP-82240 Printer.
It is a complete rewrite, not using any HP code. It does not require an HP-42S
ROM image.
Free42 Decimal (free42dec) uses the Intel Decimal Floating-Point Math Library;
it uses IEEE-754-2008 quadruple precision decimal floating point, which consumes
16 bytes per number, and gives 34 decimal digits of precision, with exponents
ranging from -6143 to +6144.
https://thomasokken.com/free42/
Utility