Free42 description:
The Free42 application was designed to be a complete re-implementation of the HP-42S calculator and the HP-82240 printer. Free42 was written from scratch, without using any HP code. You do not need any ROM images in order to use it, yet it is fully HP-42S compatible.
Starting with release 1.4, Free42 comes in Decimal and Binary versions. The two look and behave identically; the only difference is the way they represent numbers internally. All the download packages include both the Decimal and the Binary versions.
Free42 Decimal uses Hugh Steers' 7-digit base-10000 BCD20 library, which gives 25 decimal digits of precision, with exponents ranging from -10000 to +9999. Transcendental functions are evaluated to at least 20 digits. Each number consumes 16 bytes of memory.
Free42 Binary uses the PC's FPU, if available; it represents numbers as IEEE-754 compatible double precision binary floating point, which consumes 8 bytes per number, and gives an ...
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 Free42 is not available for Handheld
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Free42 is not available for Windows Portable 
