Hi Shawn
I tried the Emax os 3.2 from the link you supplied. And the emaxos.emx operating software actually does work :-) I just needed to recalibrate the Emax and I've lost the plus OS functionality, but what the heck, that's not important.
Now I'm able to boot all the hfe files on the card.
Thank you Shawn for your help.
Best regards
Brian