Int 7F Fn 0B  - Alloy Ntnx (host) - Set/reset Graphics Dos On Slave        [N]

   AH = 0Bh
   CL = 02h
   AL = slave ID number
   CH = DOS to activate
       00h graphics DOS
       01h character DOS

Return: AL = status
       00h successful
       01h nothing done, proper DOS type already loaded