Int 62 Fn 003C  u - Fgdriver V4.02 - "fg_getblock" - Grab Rectangle Of Di  [V]

   AX = 003Ch
   ES:BX -> buffer for screen contents
   CX = leftmost column
   DX = rightmost column
   SI = top row
   DI = bottom row

Notes: the FGDRIVER functions are rearranged with each major release, but
     their parameters do not change (see #3145 at AX=0000h)
   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=005Ch) to determine the required buffer size

See Also: AX=0044h,AX=005Ch,AX=0098h