INT 61 - OPTIMA 1024 VGA-Sync,ET-3000 chipset - CENTER ZOOM WINDOW
AX = 0001h
BX = X coordinate to center
CX = Y coordinate to center
Desc: Positions the zoom window such that the specified window-relative
coordinates appear as close as possible to the center of the
display. Useful for scrolling and panning.
Notes: INT 61h 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
SeeAlso: INT 16/AH=FFh"OPTIMA"