Editing I386 (section)

====80386SL{{anchor|The i386SL variant}}====
The '''80386SL''' was introduced as a power-efficient version for [[laptop computer]]s. The processor offered several power-management options (e.g. [[System Management Mode|SMM]]), as well as different "sleep" modes to conserve [[battery (electricity)|battery]] power.<ref>Ellis, Simson C., "The 386 SL Microprocessor in Notebook PCs", Intel Corporation, Microcomputer Solutions, March/April 1991, page 20</ref> It also contained support for an external [[CPU cache|cache]] of 16 to 64 [[Kilobyte|KB]]. The extra functions and circuit implementation techniques caused this variant to have over 3 times as many [[transistor]]s as the i386DX. The i386SL was first available at 20&nbsp;MHz clock speed,<ref>{{cite web|url=http://www.islandnet.com/~kpolsson/micropro/proc1990.htm |title=Chronology of Microprocessors (1990-1992) |publisher=Islandnet.com |access-date=September 17, 2010}}</ref> with the 25&nbsp;MHz model later added.<ref>{{cite web|last=Mueller |first=Scott |url=http://www.informit.com/articles/article.aspx?p=130978&seqNum=27 |title=Microprocessor Types and Specifications > P3 (386) Third-Generation Processors |publisher=InformIT |access-date=September 17, 2010}}</ref> With this system, it reduced up to 40% foot space than the Intel386 SX system. That translate to lighter and more portable cost-effective system.<ref name="Intel Corporation 1992, page 11"/>

Dave Vannier, the chief architect designed this microprocessor. It took them two years to complete this design since it uses the existing 386 architecture to implement. That assist with advanced computer-aided design tools which includes a complete simulation of system board. This die contains the 386 CPU core, AT Bus Controller, Memory Controller, Internal Bus Controller, Cache Control Logic along with Cache Tag SRAM and Clock. This CPU contains 855,000 transistors using one-micron CHMOS IV technology. It was available for USD $176 in 1,000 unit in quantities.<ref name="Chen, Allan 1991, page 2">Chen, Allan, "The 386 SL Microprocessor Superset: The 32-bit Notebook Hits the Road", Intel Corporation, Microcomputer Solutions, January/February 1991, page 2</ref> The 25-MHz version was available in samples for USD $189 in 1,000-piece quantities, that version was finally made available in production by the end of 1991.<ref>Intel Corporation, "New Product Focus: Components: New 25-MHz CPU is Fastest for Notebooks", Microcomputer Solutions, November/December 1991, page 11</ref> It supports up to 32 Megabytes of physical address space.<ref name="Intel Corporation 1992, page 11"/><ref>{{cite web | publisher=Intel Corporation | title=Introduction to the Intel386 SL Microprocessor SuperSet Technical Overview | series=Order No. 240852-002 | date=September 1991 | page=37 | url=https://bitsavers.org/components/intel/80386/240852-002_386SL_Technical_Overview_1991.pdf | via=bitsavers.org}}</ref>  There was a 20-MHz cacheless version of Intel386 SL microprocessor, at the press time samples of this version were available for USD $101 in 1,000-piece quantities.<ref>Intel Corporation, "New Product Focus: OEM: Intel386 SL CPU Version Offers Cost-Savings", Microcomputer Solutions, March/April 1992, page 12</ref>  There were low-voltage 20-Mhz version and cacheless 16- and 20-Mhz version microprocessors.  These low voltage uses 3.3 Volts to supplied them and they do support full static mode as well.  They were available for USD $94, $48 and $78 respectively in 1,000 pieces quantities.<ref>Chen, Allen, "The New Mobile PC", Intel Corporation, Microcomputer Solutions, July/August 1992, page 3-9</ref>

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File:80386SL processor from 1990.jpg|i386SL from 1990
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