Amazon.com: 80386 programming ISBN: 487593128X (1988) [Japanese Import]: 9784875931287: unknown author: Books,Programming the 80386,Rare 286-386 Kingston SX/25LCM PLCC68 Upgrade Accelerator Module JICSX25,A combination you don't see that often, an 80386 with an 80287 math coprocessor! (It took a while for the 80387 to come out, so the earliest 386 motherboards used 287s) : r/retrobattlestations,Designing an Intel 80386SX development board | LSE Blog,