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>>> So when you say "works on any reasonably modern PC", what you
>>> *actually* mean is "works on any brand new bleeding-edge PC"?
>>
>> No. I believe it was the 386 that added the capability.
>>
>> You know, two generations back before the Pentium came out?
>>
>> Added primarily to emulate multiple "DOS boxes" under Windows.
>
> The 386 or so added "virtual mode" (or whatever the exact term is) that
> makes the CPU act as if it's in real mode, but it's really in protected
> mode, and the OS can control the page mappings and so forth.
"Virtual real mode".
http://en.wikipedia.org/wiki/Virtual_8086_mode
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