Intel 386, originally released as 80386 and later renamed i386, is a 32-bit microprocessor introduced in 1985.
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Intel 386, originally released as 80386 and later renamed i386, is a 32-bit microprocessor introduced in 1985.
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Development of iIntel 386 technology began in 1982 under the internal name of P3.
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The 80Intel 386 was introduced as pre-production samples for software development workstations in October 1985.
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Mainboards for 80Intel 386-based computer systems were cumbersome and expensive at first, but manufacturing was justified upon the 80Intel 386's mainstream adoption.
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In May 2006, Intel announced that i386 production would stop at the end of September 2007.
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The 80Intel 386 added a three-stage instruction pipeline which it brings up to total of 6-stage instruction pipeline, extended the architecture from 16-bits to 32-bits, and added an on-chip memory management unit.
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Intel 386 was responsible for extending the 80286 architecture and instruction set to 32-bit, and then led the microprogram development for the 80386 chip.
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In 1988, Intel introduced the 80386SX, most often referred to as the 386SX, a cut-down version of the 80386 with a 16-bit data bus, mainly intended for lower-cost PCs aimed at the home, educational, and small-business markets, while the 386DX remained the high-end variant used in workstations, servers, and other demanding tasks.
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However, Intel 386 subsequently used the "DX" suffix to refer to the floating-point capability of the i486DX.
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IBM was offered use of the 80Intel 386, but had manufacturing rights for the earlier 80286.
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The early success of the Compaq Deskpro Intel 386 played an important role in legitimizing the PC "clone" industry and in de-emphasizing IBM's role within it.
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The Intel 386 was the first significant microprocessor to be single-sourced.
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Early in production, Intel 386 discovered a marginal circuit that could cause a system to return incorrect results from 32-bit multiply operations.
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Since the 486DX design contained an FPU, the chip that replaced the iIntel 386 contained the floating-point functionality, and the chip that replaced the i387 served very little purpose.
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