INT 62 u - FGDRIVER v4.02 - "FG_ERASE" - CLEAR THE ACTIVE VIDEO PAGE
	AX = 0028h
Notes:	the FGDRIVER functions are rearranged with each major release, but
	  their parameters do not change (see #03474 at AX=0000h)
	This function sets each pixel to 0 in graphics modes, each character
	  cell to a blank with a gray foreground attribute in text modes
SeeAlso: AX=0029h,AX=002Bh,AX=0035h