first came in 1982 February . this processors used IBM advanced technology machines. this micro-processors have 8-20 MHz speed. it contains 1,34,000 transistors . this was first multi-tasking micro-processor. it's data bus 16 bits , and address bus 32 bits
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INTEL 80386
80386 processors have three type of varieties . they are DX,SX,SL.386DX have 2,75,000 transistors. 386SX series cheaper compare with DX. In 1990 386 SL processors are available. it was the first processors used in portable computers. this processors have speed of 20-25 MHz
speed. this processors have some more advantages they can save power by shut down certain parts. they have SMM(system management mode)
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INTEL 80486 DX
they came out in 1989 . they have 1.2 00,000 transistors . they have clock frequency 25 MHz -30 MHz . they have 32 bits data and address bus . this processors have 'Math Co-Processor' this used to help arithmetical operations. this have 16 kb L! cache and 128 kb l2 cache
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INTEL 80486 SX
this came out in 1991. they were cheaper when compared with DX . they have 1,185,000 transistors . this had no math co-processors
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INTEL 80486 DX2
they available in market in 1992. this type of processors have 1,200,000 transistors
. there clock speed 50 MHz 66 MHz
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INTEL 80486 SL
this processors also available at the market in 1992. this processors developed only for note book computers. this processors have 20 MHz-33 MHz . this processors have 1,400,000 transistors
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INTEL 80486 DX4
this processors came out in 1994. this processors have clock speed 75 MHz to 100 MHz . they have 1,600,000 transistors. for making this processors they used .6 micron fabrication technology . that mean the distance between two transistors is .6 micron. this processors fixed on 168 PGA designed sockets
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