VGA routines (wanted)

[Alan Dorn Hetzel]

I am looking for routines useable under DOS and/or XENIX on a 80386
based system to do the following:

   1) switch my VGA from text to 320x200x256color mode

   2) write information to the graphics screen either pixel at a time
      or in blocks.

   3) switch  the screen back to 80x24 text mode.

Any suggestions>?

 p.s. assembly or C would be preferable, but whatever else would be
      fine too.

  Dorn

  gatech.edu!fabscal!dorn