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The central processing unit

The Central Processing Unit

Microprocessors, also called central processing units (CPUs), are frequently described as the "brains" of a

computer, because they act as the central control for the processing of data in personal computers (PCs) and

other computers. Chipsets perform logic functions in computers based on Intel processors. Motherboards combine

Intel microprocessors and chipsets to form the basic subsystem of a PC. Because it's part of every one of

your computer's functions, it takes a fast processor to make a fast PC. These processors are all made of transistors.

The first transistor was created in 1947 by a team of scientists at Bell Laboratories in New Jersey. Ever since 1947

transistors have shrunk dramitically in size enabling more and more to be placed on each single chip.

The transistor was not the only thing that had to be developed before a true CPU could be produced. There also

had to be some type of surface to assemble the transistors together on. The first chip made of semiconducitve material

or silicon was invented in 1958 by Jack Kilby of Texas Instruments. Now we have the major elements needed to produce

a CPU. In 1965 a company by the name of Intel was formed and they began to produce CPU's shortly thereafter.

Gordon Moore, one of the founders of Intel, predicted that the number of transistor placed on each CPU would double

every 18 months or so. This sounds almost impossible, however this has been a very accutate estimation of the evolution

of CPUs. Intel introduced their first processor, a 4004, in November of 1971. This first processor had a clock speed

of 108 kilohertz and 2,300 transistors. It was used mainly for simple arithmetic manipulation such as in a calculator.

Ever since this first processor was introduced the market has done nothing but soared to unbelievable highs. The first

processor common in personal computers was the 8088. This processor was introduced in June of 1978. It could be

purchased in three different clock speeds starting at 5 Megahertz and going up to 10 Megahertz. This CPU had 29,000

transistors. Then came the 80286 and 80386 processors. The 386 was the first processor to be introduced in the DX,

SX, and SL versions. Next came the 80486 processors of which there were even more choices here. The first 486

processor had 1,200,000 transistors and the latest have 1.4 million transistors. There clock speeds varied any

where from 16 MHz on the first ones to 100 MHz on the most recent 486 processors. Some of which are still in use in

homes all around the country. Next came the Pentium Processor, March 1993, running at clock speeds of 60 & 66 Mhz.

These first pentium processors had 3.1 million transistors, and had a 32-bit data path. Now the pentium processor

range anywhere from 90 MHz to 200 MHz and are the most widely used processor today. Intel is currently producing two

new pentium processors with MMX technology. These two processors, running at 166 & 200 MHz, are made to accelarate

graphics and multimedia software packages. Currently the newest processor to be introduced in a 400 MHz processor

made also by Intel. This new processor illustrates the performance potential of the new P6 architecture. It

contains 7.5 million transistors and also includes the new MMX technology.

Source: Essay UK -

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