Int 10 Fn 05  - Video -  Select Active Display Page                        [V]

   AH = 05h
   AL = new page number (00h to number of pages - 1) (see AH=00h)
Desc:  specify which of possibly multiple display pages will be visible

Note:  to determine whether the requested page actually exists, use AH=0Fh
     to query the current page after making this call

See Also: AH=0Fh,AH=43h,AH=45h