Intel 80486: Perbedaan antara revisi

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[[Image:80486dx2-large.jpg|300px|thumb|The exposed die of an Intel 80486DX2 microprocessor.]]

[[Image:80486DX2_arch.png|300px|thumb|The 486DX2 architecture.]]

 

 

 

 

 

 

 

[[Image:Intel 80486DX-33.jpg|thumb|An Intel 80486DX-33 microprocessor]]

There are several suffixes and variants including:

Internal clock rates included 16, 20, 25, 33, 40, 50, 66, 75 and 100 MHz, although the 100 MHz versions could be somewhat unstable. The 486DX2 66 MHz was the most widespread high-end 486 chip, while more powerful iterations such as the OverDrive and DX4 were less used in favour of the succeeding [[Pentium]]. The only 486 that ran a 50 MHz bus, the 486DX 50 MHz chip, had compatibility problems with boards and components because of this high bus speed requirement. 486DX 50 MHz was a rather unpopular chip and was quickly replaced by the clock-doubled [[Intel 80486DX2|486 DX2]] chips which ran the bus at half of the CPU clock speed.

 

486 compatible processors have been produced by other companies such as [[International Business Machines|IBM]], [[Texas Instruments]], [[AMD]], [[Cyrix]], and [[Chips and Technologies]]. Some are almost exact duplicates in specifications and performance, some are not. The 486 was, however, covered by many of Intel's 386 patents as well as some of its own. Intel and IBM have broad cross-licenses of these patents, and AMD was granted rights to the relevant patents in the 1995 settlement of a lawsuit between the companies.[http://www.amd.com/us-en/assets/content_type/DownloadableAssets/AMD_-_Intel_Litigation_History.pdf]

 

With regards to the 486 system platform, early 486 machines were equipped with only [[16-bit]] and [[8-bit]] [[industry standard architecture|ISA]] slots. Later [[motherboard]]s combined ISA with the high-speed [[VESA Local Bus]] (VLB), primarily for video cards and hard drive controllers. The final 486 boards came equipped with [[Peripheral Component Interconnect|PCI]] and ISA, and sometimes VLB as well (though in this configuration VLB suffered performance-wise). Bus speed was determined by multipliers for ISA, but PCI and VLB bus clocks were often equal to the clock of the 486 bus (some boards had multipliers for these as well).

 

Later 486 boards also supported [[Plug-and-play]], the [[Microsoft]] technology that began as a part of [[Windows 95]] designed to make component installation easier for consumers.

 

*[[List of Intel microprocessors]]

*[[Motorola 68040]], although not compatible, often considered the [[Motorola]] equivalent to the Intel 80486 in terms of performance.

 

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* http://users.erols.com/chare/486.htm

* [http://www.cpu-collection.de/?l0=co&l1=Intel&l2=i486%20DX Intel 80486 images and descriptions at cpu-collection.de]

{{Intel_processors}}

 

[[Category:Intel|80846]]

[[Category:x86 microprocessors|Intel 486]]

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