TIL Apple used to sell "486 PC on a card", which was a 486-based PC made into an extension card that shared resources with the host system. Thus allowing to run DOS and older Windows versions in a window of your Mac.
https://www.youtube.com/watch?v=4OcORkw2rJI
https://www.youtube.com/watch?v=4OcORkw2rJI
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SPARCs had those too: https://en.wikipedia.org/wiki/SunPCi
With more capable CPUs!
