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In the 1980s, it was common in [[IBM PC]]/compatible [[microcomputers]] for the FPU to be entirely separate from the [[Central processing unit|CPU]], and typically sold as an optional add-on. It would only be purchased if needed to speed up or enable math-intensive programs.
The IBM PC, [[IBM Personal Computer XT|XT]], and most compatibles based on the 8088 or 8086 had a socket for the optional 8087 coprocessor. The [[IBM Personal Computer/AT|AT]] and [[Intel 80286|80286]]-based systems were generally socketed for the [[x87#80287|80287]], and [[Intel 80386|80386/80386SX]]-based machines{{snd}} for the [[x87#80387|80387]] and [[Intel 80387SX|80387SX]] respectively, although early ones were socketed for the 80287, since the 80387 did not exist yet. Other companies manufactured co-processors for the Intel x86 series. These included [[Cyrix]] and [[Weitek]]. While [[Acorn Computers]] opted for the WE32206, to offer [[IEEE 754|IEEE 754-85]] 80bit precision, to its [[ARM architecture|ARM]] powered Archimedes range.
Coprocessors were available for the [[Motorola 68000 series|Motorola 68000 family]], the [[Motorola 68881|68881 and 68882]]. These were common in [[Motorola 68020]]/[[Motorola 68030|68030]]-based [[workstation]]s, like the [[Sun-3]] series. They were also commonly added to higher-end models of Apple [[Macintosh]] and Commodore [[Amiga]] series, but unlike IBM PC-compatible systems, sockets for adding the coprocessor were not as common in lower-end systems.
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