INT 10 - VIDEO - SCROLL DOWN WINDOW                                             
	AH = 07h
	AL = number of lines by which to scroll down (00h=clear entire window)
	BH = attribute used to write blank lines at top of window
	CH,CL = row,column of window's upper left corner
	DH,DL = row,column of window's lower right corner
Return: nothing
Note:	affects only the currently active page (see AH=05h)
BUGS:	some implementations (including the original IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. PCIBM PC) have a bug which
	  destroys BP
	the Trident TVGA8900CL (BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. dated 1992/9/8) clears DS to 0000h when
	  scrolling in an SVGA(Super VGAVideo Graphics Array) A video adapter capable of higher resolution (pixels and/or colors) than the 320x200x256 and 640x480x16 which IBMInternational Busiuness Machines's VGAVideo Graphics Array adapter is capable of producing.  See also VESA. mode (800x600 or higher)
SeeAlso: AH=06h,AH=12h"Tandy 2000",AH=72h,AH=73h,INT 50/AX=0014h