Seriously, fun read! I never knew the old PC gfx chips had so much hardware in them!
Neither did I, until I started reading Michael Abrash's
Black Book. EGA and VGA especially are just
loaded with features you never hear about anywhere else, it's a shame so few games take advantage of them. (
Dangerous Dave in the Haunted Mansion does, I think
Jazz Jackrabbit probably uses them as well, but a whole lot of stuff just uses unadorned framebuffer graphics.)