Projects / Nonpareil


Nonpareil is a microcode-level simulator for HP calculators introduced between 1972 and 1982, including the HP-35, HP-45, HP-55, HP-25, HP-34C, HP-38C, HP-41CV, HP-11C, HP-12C, HP-15C, HP-16C, and other models. The necessary microcode is included, as is a microcode assembler. The GTK+ toolkit is used for the user interface.

Operating Systems

Recent releases

  •  31 Oct 2006 07:41

    Release Notes: Build problems that occurred with certain versions of Bison were fixed. The need for an X server during the build process was eliminated.

    •  28 Jun 2005 09:51

      Release Notes: This release fixes a serious simulation problem that caused incorrect results for some functions on the simulated Classic series calculators (HP-35, HP-45, HP-55, and HP-80).

      •  27 Jun 2005 08:11

        Release Notes: The program now works on Microsoft Windows in addition to Linux and other POSIX platforms.

        •  23 Jun 2005 08:00

          Release Notes: A problem that prevented 41CX simulation from working was fixed. Suitable .mod files for the 82143A Printer and 82182A Time Module are now provided.

          •  20 Jun 2005 11:20

            Release Notes: This release introduces 82143A printer support (including graphics) for the 41C family, with the ability to save the printer output as a PNG file. The 41C and Voyager keyboard support has been enhanced to provide two-key rollover matching the actual calculators.


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