I was a keen OS/2 2.x user.
I reviewed ArcaOS:
https://www.theregister.com/2023/09/04/arcaos_51/
... and interviewed one of the project leads:
https://www.theregister.com/2023/01/19/retro_tech_week_arca_...
So when I read this:
> dual booting OS/2 Warp 4.51 and Arca OS 5.1
... I laughed, bitterly.
It is still _extremely_ fussy about installation and across 4 test machines I never got ArcaOS to dual-boot with anything except a single basic IBM PC DOS 7.1 setup.
Anything more than a single bootable primary partition in BIOS config is highly unlikely to work, in my experience. In UEFI mode it's even fussier and of course actual IBM OS/2 won't run then.
Forget dual booting, except maybe with DOS.
Trying to dual boot two OS/2 instances sounds like a recipe for hair loss or a cardiovascular incident. I don't think I'd try to do that if you paid me. Paid me a lot.
