[TUHS] Windows roots and Unix influence (was Re: Happy birthday, Ken Thompson!)

[Robert Brockway]

On Sun, 4 Feb 2018, Angelo Papenhoff wrote:

> At some point they moved some graphical things into the kernel that were
> in user space originally (I don't know what exactly), this was done for
> performance reasons. Perhaps that's what you meant with the "bolted on"
> GUI.

I watched the development of NT during that period and I recall that 
graphics was originally in ring 1 on i386 until NT 3.51.  From NT 4 
onwards graphics drivers were moved to ring 0 (the kernel).

I believe this push came from the marketting department.  Moar speed!

Cheers,

Rob