Int 62 Fn 0031  u - Fgdriver V3.03 - "fg_getblock" - Grab Rectangle Of Di  [V]

   AX = 0031h
   ES:BX -> buffer for screen contents
   CX = leftmost column
   DX = rightmost column
   SI = top row
   DI = bottom row

Notes: For FGDRIVER v1.10, this function was unused, and "FG_GETBLOCK" did not
     exist yet
   In text modes, coordinates are character positions; in graphics modes,
     they are defined in screen space, and the left and right edges are
     adjusted to a byte boundary if necessary
   Use "FG_IMAGESIZ" (see AX=004Bh) to determine the required buffer size

See Also: AX=0038h,AX=004Bh,AX=007Dh