mu42 is an emulator for the Pioneer series calculators HP10B, HP14B, HP17B, HP17BII, HP20S, HP21S, HP22S, HP27S, HP32S, HP32SII and HP42S and for the Clamshell series calculators HP19BII and HP28S. It base on the sources of the famous HP calculator emulator Emu48 and is published under the GPL. The emulator PC version is running on all Win32 platforms and the Mobile version should run on all ARM CPU based Pocket PC 2002, Windows Mobile 2003 (SE), 5.0, 6 Classic and Professional versions. The Mobile version don't support the Low-End Pioneers HP10B, HP20S and HP21S. You may have a look onto the latest changes. Like all emulators Emu42 needs a ROM image for each emulated calculator to work. I have no license to publish them, so they aren't included in the emulator package. Sorry I will not answer any ROM image related questions. For further information how to extract the ROM images from the High End Pioneers and the HP28S read the documentation of the ROM upload packet and the Emu42 manual please. For all other calculators you need external hardware and knowledge to extract the data from the Saturn bus system, a way which was gone by Jean-François Garnier to extract the HP22S, the HP32S and the HP32SII rev. B ROM image. I especially want to thank Sébastien Carlier, Cyrille de Brebisson, Raymond Del Tondo, Jean-François Garnier, Erik Ehrling and many others for their material I used for making this program.