INT 62 u - FGDRIVER v4.02 - "FG_GETPAGE" - GET ACTIVE VIDEO PAGE NUMBER
	AX = 004Ch
Return: AX = active video page (0000h-003Fh)
Note:	the FGDRIVER functions are rearranged with each major release, but
	  their parameters do not change (see #03474 at AX=0000h)
SeeAlso: AX=0039h,AX=0042h,AX=0043h,AX=0050h,AX=00B2h