Int 10 Fn 05  - Video - Pcjr, Tandy 1000 - Set Crt/cpu Page Registers      [V]

   AH = 05h
   AL = subfunction
       81h set CPU page register
       BL = CPU page
       82h set CRT page register
       BH = CRT page
       83h set both CPU and CRT page registers
       BL = CPU page
       BH = CRT page

Return: nothing

Notes: the CPU page determines which 16K block of the first 128K of physical
     memory will be mapped at B800h by the hardware
   the CRT page determines the start address of the memory used by the
     video controller

See Also: AX=0580h