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I know that two operating systems can share the same computer through hosting. For example, WINE can host Windows, or vice versa, Virtual Box can host a Linux system on a Windows box, but in both cases only one operating system is actually controlling the motherboard and is providing interfaces to the hosted OS.
Is it possible to configure a system to actually share a motherboard between two operating systems?
For this to work, the motherboard would probably have to have two CPUs and also some way to split the memory. Also, you would probably need two video cards and a way of dedicating peripheral slots to one OS or the other.
So you don't mind a double of everything but the motherboard huh – Tom Yan – 2016-07-20T13:49:00.773
I know of zero computers that have the capability to POST into multiple operating systems simultaneously. You do understand that after a system does a POST, it attempts to find the boot storage device, if you have multiple storage devices that can boot, you still have a primary boot storage device that allows you to chain load those devices. I don't agree that a mainframe can boot to multiple operating systems, and run those operating systems, simultaneously. I say that, with a good amount of knowlege, on an IBM mainframe. – Ramhound – 2016-07-20T14:02:08.197