OK, small report: COMI don't work on HPC Pro (Jornada 680). There is only the screen "Loading..." shown and nothing else. The system doesn't hang because I can start the task-manager and kill the hanging PocketScumm task. All other games I have tested after that (indy3, atlantis, monkey1vga, monkey2, dott, samnmax) starting correct. It seems that only COMI won't start...
Maybe I should say I have not a simple Jornada 680 with only 8 MB RAM, I have installed a RAM upgrade to 16 MB RAM (as the Jornada 690). I have also an application running, showing me the used RAM and while I start COMI, there doesn't change the value of used RAM. It should be enough memory available...
Sorry for the bad news...