On 21 Nov 97, Marius Bendiksen wrote to James Vahn --
 MB> > A little do-nothing meant to create a slight I/O delay by clearing
 MB> > the prefetch queue and forcing the CPU to re-read memory. Not really
 MB> Actually, it is quite necessary, if you're switching to protected
 MB> mode. Otherwise, the system will do incorrect adress-translation.
It's the same for setting PG, IIRC.
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