Might need a BIOS update to recognize coppermine. Also some old BX boards like my P2B rev 1.02 can't put out CPU voltage below 1.8, so it needs a slotket that can override the CPU's voltage request.
tcwo.com has the ASUS slotket with voltage override for $26+shipping. People in the Forsale forum have sold other slokets for around $15 but make sure it can set the voltage if your mobo can't. (Search on P2B in this forum for details). I might be selling my ASUS slotket this week for $20 shipped, trying to decide what to upgrade my server with (100 MHz on slotket or an athlon cpu+mobo).