Catalog > Manufacturer > ULSI   Product Type Part Number Description Detail Price Processors US83C87 30mhz Advanced Math Coprocessor DX / DLC 30 mhz CPU $49.00 Processors US83C87 40mhz Advanced Math Coprocessor DX / DLC 40 mhz CPU $39.00 Processors US83D87 Advanced Math Coprocessor DX2 - 9436A3A 66 mhz CPU $49.00 Copyright © 1996-2018 Computer Parts Galore. All rights reserved.