Intel 487SX

processor A version of the Intel 486DX microprocessor

with an extra pin, for use in the coprocessor socket of an

Intel 486SX system. The 487SX provides the FPU which is

missing in the 486SX.

Although the 486SX is completely disabled when you install a

487SX, the 487SX design requires that you leave the 486SX in

your PC [why?], rather than use it elsewhere. Intel admits

that in some systems you can unplug the 486SX and fit a 487SX

in its place but they don't guarantee that it will always

work.

See Intel 486.

(1995-05-10)