The Evalution Of The Microprossesor Essay

1242 words - 5 pages

The microprocessor has changed a lot over the years, says (Michael W.Davidson,http://micro.magnet.fsu.edu/chipshot.html) Microprocessortechnology is progressing so rapidly that even experts in the field arehaving trouble keeping up with current advances. As more competitiondevelops in this $150 billion a year business, power and speed of themicroprocessor is expanding at an almost explosive rate. The changeshave been most evident over the last decade. The microprocessor haschanged the way computers work by making them faster. Themicroprocessor is often called the brain of the C.P.U.(or the centralprocessing unit)and without the microprocessor the computer is more orless useless. Motorola and Intel have invented most of themicroprocessors over the last decade. Over the years their has been aconstant battle over cutting edge technology. In the 80's Motorola wonthe battle, but now in the 90's it looks as Intel has won the war.The microprocessor 68000 is the original microprocessor(Encarta 95). Itwas invented by Motorola in the early 80's. The 68000 also had two verydistinct qualities like 24-bit physical addressing and a 16-bit databus. The original Apple Macintosh ,released in 1984, had the 8-MHzfound at the core of it. It was also found in the Macintosh Plus, theoriginal Macintosh SE, the Apple Laser-Writer IISC, and the Hewlett-Packard's LaserJet printer family. The 68000 was very efficient for itstime for example it could address 16 megabytes of memory, that is 16more times the memory than the Intel 8088 which was found in the IBM PC. Also the 68000 has a linear addressing architecture which was betterthan the 8088's segmented memory architecture because it made makinglarge applications more straightforward.The 68020 was invented by Motorola in the mid-80's(Encarta 95). The68020 is about two times as powerful as the 68000. The 68020 has 32-bitaddressing and a 32-bit data bus and is available in various speeds like16MHz, 20MHz, 25MHz, and 33MHz. The microprocessor 68020 is found in theoriginal Macintosh II and in the LaserWriter IINT both of which are fromApple.The 68030 microprocessor was invented by Motorola about a year after the68020 was released(Encarta 95). The 68030 has 32-bit addressing and a32-bit data bus just like it's previous model, but it has paged memorymanagement built into it, delaying the need for additional chips toprovide that function. A 16-MHz version was used in the Macintosh IIx,IIcx, and SE/30. A 25-MHz model was used in the Mac IIci and the NeXTcomputer. The 68030 is produced in various versions like the 20-MHz,33MHz, 40-MHz, and 50MHz.The microprocessor 68040 was invented by Motorola(Encarta 95). The68040 has a 32-bit addressing and a 32-bit data bus just like theprevious two microprocessors. But unlike the two previousmicroprocessors this one runs at 25MHz and includes a built-in floatingpoint unit and memory management units which includes 4-KB instructionand data coaches. Which just happens to eliminate the need...

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