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The Intel i386 SX Processor
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Late in the 80386's production run, Intel introduced the 80386SX, which was meant to be a low cost version of the i386. The SX series of chips was 32-bit internally, but had a 16-bit external bus (in much the same way that the 8088 in the original IBM PC was a lower cost version of the 8086). The original 80386 was subsequently renamed the 80386DX to avoid confusion. Neither CPU included a math coprocessor (most motherboards included a socket for an 80387), though the naming would cause some head-scratching later when the 486 came in a DX variant that did include floating-point capability (while the 486SX did not).
References:
i386 Manuals and Datasheets
Wikipedia
Intel
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