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  Description:  Set Display Page      [CGA] [PCjr] [EGA]
                                            [MCGA] [VGA]
 
  Selects the active display page for the video display.
 
  Input                                           Output
  ════════════════════════════════════════        ════════════════════
  For CGA, EGA, MCGA, VGA                         If CGA, EGA, MCGA, or
  AH=05H                                           VGA adapter: nothing
  AL=page
     0-7 for modes 00H and 01H (CGA, EGA,         If PCjr and if function
      MCGA, VGA)                                   called with AL=80H-83H:
     0-3 for modes 02H and 03H (CGA)
     0-7 for modes 02H and 03H (EGA, MCGA,        BH=CRT page register
      VGA)
     0-7 for mode 07H (EGA, VGA)                  BL=CPU page register
     0-7 for mode 0DH (EGA, VGA)
     0-3 for mode 0EH (EGA, VGA)
     0-1 for mode 0FH (EGA, VGA)
     0-1 or mode 10H (EGA, VGA)
  For PCjr only
  AH=05H
  AL=subfunction
     80H =read CRT/CPU page registers
     81H =set CPU page register
     82H =set CRT page register
     83H =set both CPU and CRT page
      registers
  BH=CRT page (Subfunctions 82H and 83H)
  BL=CPU page (Subfunctions 81H and 83H)
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