Int 62 Fn 0019  u - Fgdriver V4.02 - "fg_defpages" - Def Src/dest Pages F  [V]

   AX = 0019h
   BX = source page
   CX = destination page
Desc:  specify the source and destination SVGA banks for block transfers on
     extended video pages

Notes: the FGDRIVER functions are rearranged with each major release, but
     their parameters do not change (see #3145)
   This function is ignored if the video controller does not support
     extended pages or the current video mode does not allow them

See Also: AX=0014h,AX=00CAh