Motherboard id and manual needed

I need the manual. How I can identify old mobo with 166mhz intel mmx, Bios: Amibios American Megatrends L597476 and Tx Pro-II chipset (green). In AM website (nor MoBO org) there no reference to that Bios. Also I know that tx pro-ii is related to some SiS chipset. Any clue?