Software Listing of Author : "Thomas Okken"

  • Free42
  • License: Shareware
  • Price:

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.

The calculator integrates both the binary and decimal versions, which look identically, but represent the numbers internally in different ways.

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...

  • Platform: Win7 x64, Windows 7, WinOther, WinVista
  • rom2raw
  • License: Shareware
  • Price:

rom2raw is a practical application designed to help you convert the ROM files into RAW programs that can be used for calculator emulators. If you are using Free42 or Emu42, this tool can help you create programs from HP-41 ROM images.

In order to convert an image you need to specify the source file and enter the command line arguments. You can also use batch files for specifying multiple arguments or running the application for more than one ROM.


  • Platform: WinOther
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