is it so simple? I don't want to bin 3.9 on my amiga... also the kickflash/algorPRO roms get in the way... also am I supposed to have it on a partition smaller than 2gb? on the 2nd partition perhaps after 3.9?
Yes, for me it was that simple. I have 2 Partitions each 20 GB, one for OS3.9 and one for MorphOS. By default it boots OS3.9, if I want to boot MorphOS I just change the bootdevice in the Early-Startup.