 Also known as a
386 or the i386, the 80386 developed by Intel
and was introduced in October 1985
as an upgrade to the 80286 processor and stopped being produced in September 2007.
The initial 80386 was a 32-bit chip, incorporated 275,000
transistor, originally sold for $299, and was available in clock speeds between 12 and 40MHz.
The Intel 80386SX processor was
introduced in 1988 as a low cost alternative to the original 386 processor. The 80386SX lacked a math
coprocessor but still featured the 32-bit architecture and built-in multitasking. The
chip was available in clock speeds of 16MHz, 20MHz, 25MHz, and 33MHz.
The 80386DX or 386DX processor was actually the original 386 processor renamed and not a different 386 processor.
The 80386SL, more commonly known as the
386SL, was a version of Intel
Corp.'s 386DX microprocessor first manufactured in 1990 featuring low power consumption
and was used mainly in portable
computers.
Finally, the 80387 was the math coprocessor used with the Intel 386 processor.
Known issues
Some 386DX 16MHz Intel processors had a small bug, which appeared as a software problem. The bug occurred when running true 32-bit code in a program such as within OS/2 2.x, Unix/386, or Windows in Enhanced mode. The bug would cause the system to lock up and is a difficult issue to determine without having Intel actually look at the chip. Chips that passed the test, and all subsequent chips
that were bug-free, were marked with a double-sigma symbol. 386DX chips that are not marked with either of these symbols may have not been tested by Intel and may be defective.
Also see: 32-bit, Processor definitions
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