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> I found several Hypervisors but most of them just allowed single-tasking. Probably to cut down the development time. So I ended up with the Nova Microhypervisor from Udo Steinberg and evaluated that.

Thx, it looks interesting. But is it already dead project? Latest package from 2011? I only had a quick look, burned ISO and booted. It looks very light and src not so huge tree. Did you also recompiled it?
It would be interesting if it could be booted from HDD and then boot multiple DOS instances directly from HDD and use this hipervisor as DRDOS task manager. I'm not sure - it's just task switcher or real multitasking (give time slices also for backgroud VMs)?

Maybe such code could be reasonably managed (C is better for me than pure asm) and extended by some needed HW emulations. Maybe also other users on BTTR would be interested. I'm still busy but I will read your PDF and play more with Nova. I also found they linked http://genode.org/ project, also looks interesting.

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