Int 61 Fn 0008  - Optima 1024 Vga-sync,et-3000 Chipset - Set Zoom Offset   [V]

   AX = 0008h
   BX = X start of zoom offset
   CX = Y start of zoom offset
Desc:  specifies the first byte of video memory to appear in the zoom window
Range: unknown

Notes: INT 61 is the default interrupt; the actual interrupt number can be
     obtained by calling INT 16/AH=FFh
   not all vendors include the Tseng TSR which supports these functions

See Also: AX=0000h"OPTIMA",AX=0006h"OPTIMA",INT 16/AH=FFh"OPTIMA"