Unbelievable!!! I was using a third party cmd line app called PowerCmd for testing... I tried windows stock and it worked first time!! Lesson learned - if hit a brick wall, 1st test = using Windows Cmd. Correct cmd: demul.exe -run=dc -image="I:\EmuTests\roms\Dreamcast\Quicklaunch\Soul Calibur v1 001 1999 Namco PAL M4 zip\Soul Calibur v1.001 (1999)(Namco)(PAL)(M4)[!].gdi" There's 10 hours of my life I'll never get back... -------------- Original Post ----------------------------------------- So, this post here made it look easy! http://www.gameex.info/forums/topic/12094-resolved-demul-and-dreamcast/ But can I find a way to do this? (rhetorical 'no') tried: demul.exe -run=dc -image="I:\EmuTests\roms\Dreamcast\Quicklaunch\Soul Calibur v1 001 1999 Namco PAL M4 zip\Soul Calibur v1.001 (1999)(Namco)(PAL)(M4)[!].gdi" and demul -run=dc -rom="I:\EmuTests\roms\Dreamcast\Quicklaunch\Soul Calibur v1 001 1999 Namco PAL M4 zip\Soul Calibur v1.001 (1999)(Namco)(PAL)(M4)[!].gdi" no dice... the gdi boots fine if I load via demul gui (Config>GD-ROM>Imagefile). GDRImage plugin selected. Demul does launch, but 'silently' - running in background processes but not visable on screen. Also, no sign of game running. Any ideas? Very little documentation available online,.