INTEL D80287-10 Math Co-Processor Ceramic from 1980's for that IBM AT computer

1PCS D80287-10 CDIP40 IC

(1 PC) D80287-8 INTEL Math Processor, CMOS, 8 MHz, CDIP40

D80287-6 INTEL Math Processor, CMOS, 6 MHz CDIP40

Intel D80287-6 or D80287-8 or D80287-10 8-Bit Arithmetic Processor CDIP40 x 1pc

(1 PC) D80287-10 INTEL Math Processor, CMOS, CDIP40

D80287-6 INTEL Math Processor, CMOS, CDIP40

D80287-10 INTEL D80287 ALU VINTAGE IC 40-Pin CERDIP LAST ONES RARE NOS QTY-1