INT 15 - Chips & Technologies '65530' BIOS - MODE SET HOOK

	AX = 5F33h
	BL = current width in characters
	BH = curent video mode
	CH = active display page
Return:	nothing
Desc:	this function is called at the end of a video mode set
Note:	the OEM has the option of enabling or disabling this callout, as well
	  as specifying whether the callout occurs on INT 15h or INT 42h
SeeAlso: AX=5F31h,AX=5F35h,INT 10/AX=5F50h,INT 42/AX=5F33h