1. Could look at old reviews of AMD boards for the XP processors, and search for a mATX board. I don't remember any, though.
2. I have an older HP computer that came with Windows ME and an Athlon 850 processor, which I suppose is a standard ATX size socket A board. I was thinking of putting it back together to run some old games that don't work in WinXP, but with a better video card and hopefully a newer CPU. I have an old Athlon XP 1800+ lying around. Could I plug that CPU into the old HP motherboard? I suspect it won't recognize the newer XP CPUs without a bios update, which ain't available for this old HP motherboard. Do you have any comments/suggestions?