Does anyone know if there's a version or similar program for mac? 13 comments. The only converter I've been able to find on Google is CHDMAN which is a Windows EXE and doesn't work on Mac (I have no way to use Windows). Or, if you prefer, you may use “createhd. Note that if you are using Mac OS X to access the image, you must drag the drive icon to the eject/trash first to unmount the image prior to running CHDMAN to convert to MESS format. Feb 16, 2012Convert a Basilisk image back into MESS CHD format : chdman createhd -c none -i basiliskdrive.dmg -o messdrive.chd. Salese] m68k: add preliminary on-board peripherals to 6830 SDL: Fix formatting of chdman man page Allow compilation with compatible system-installed versions of libjpeg and libflac.