Hatari uses 2 different cpu core mode : - the old one is best used for STF/STE emulation - the new one will give better Falcon compatibility The archive hatari_1.7.0_OSX_x86_ppc.zip contains a version of Hatari compiled for PPC and x86 (32 and 64 bits). It should work with OSX 10.4 to 10.8. It is compiled with the old cpu core, so it will work better in STF/STE mode than in Falcon mode. The archive hatari_1.7.0_Falcon_OSX_x86.zip contains a version of Hatari compiled only for x86 (32 and 64 bits). It should work with OSX 10.4 to 10.8. It is compiled with the new cpu core and is the version to use if you want to get the best emulation results in Falcon mode (but not in STF/STE mode) Thanks to Jerome Vernet for providing these builds.