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MorphOS is based on quark Mickrokernel which pilotes sandboxes. Actually two are active: ABox and QBox. ABox sandbox contains the Amiga related API.
Any sandbox is protected from other sandboxes running of their own.
At this stage, if some old applications crash into ABox, it crashes the entire MorphOS, just because the fact that Abox contains all the hardware drivers and device handlers (monitor, graphic card, drives, memory managment).
When all these device handlers will be moved into QBox, then if ABox will crash, it will just only ABox that will need to be restarted like as stopping or quitting and restarting a single program.
From the other side of the Amiga planet, then AmigaOS 4.0 just reached a new stage in its history because it has got its own protected memory system. read more about it here:
I just signalled these news to OSNews and hope it could be inserted soon in the main page because such an important notice of a serious upgrade needs a visible space to be published in.