Truthfully, what I'd like is to run Linux as a Virtual Machine base and be able to guest nearly every small scale OS in history. (I don't feel the need to run IBM mainframe OS'es, although you probably could run base MVS on a top end PC nowadays.)
You can do it for most old 8 bit OS'es (with emulators), also early Mac OS'es, but later ones have been cut off by Apple by specialized hardware control requirements...
Now if only someone would write an interface for Virtual PC 2004 (which allows running DOS all the way back to 1.0)....
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