I have some 68881 20Mhz math coprocessors that are original Sun parts. These have SC87948R20B on them instead of the MC68881RC20 marking. They are $75.00 or $80.00 cod and are available on first come first serve basis. Vance Chin {uunet,ucbvax}!unisoft!bdt!bms or 415 547-2191