<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.
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