Intel 486DX

from The Free On-line Dictionary of Computing (8 July 2008)

Intel 486DX

   <processor> One of {Intel}'s {Intel 486} family of
   {microprocessors} (one of the last before the {Pentium}).  The
   486DX has a working built-in {floating point unit} (FPU).  The
   {Intel 486SX} is effectively a DX with the FPU disabled.  The
   DX has a pin to select the external {data bus} width (16 or
   32).

   The {Intel 487SX} is a 486DX with a 486SX pinout.

   (1995-05-09)