The Evaluation Of The Microprocessor Essay Research

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The Evaluation Of The Microprocessor. Essay, Research Paper The Evaluation of the Microprocessor. The microprocessor has changed a lot over the years, says (Michael W. Davidson,http://micro.magnet.fsu.edu/chipshot.html) Microprocessor technology is progressing so rapidly that even experts in the field are having trouble keeping up with current advances. As more competition develops in this $150 billion a year business, power and speed of the microprocessor is expanding at an almost explosive rate. The changes have been most evident over the last decade. The microprocessor has changed the way computers work by making them faster. The microprocessor is often called the brain of the C.P.U.(or the central processing unit)and without the microprocessor the computer is more or less

useless. Motorola and Intel have invented most of the microprocessors over the last decade. Over the years their has been a constant battle over cutting edge technology. In the 80’s Motorola won the battle, but now in the 90’s it looks as Intel has won the war. The microprocessor 68000 is the original microprocessor(Encarta 95). It was invented by Motorola in the early 80’s. The 68000 also had two very distinct qualities like 24-bit physical addressing and a 16-bit data bus. The original Apple Macintosh ,released in 1984, had the 8-MHz found at the core of it. It was also found in the Macintosh Plus, the original Macintosh SE, the Apple Laser-Writer IISC, and the Hewlett-Packard’s LaserJet printer family. The 68000 was very efficient for its time for example it could

address 16 megabytes of memory, that is 16 more times the memory than the Intel 8088 which was found in the IBM PC. Also the 68000 has a linear addressing architecture which was better than the 8088’s segmented memory architecture because it made making large applications more straightforward. The 68020 was invented by Motorola in the mid-80’s(Encarta 95). The 68020 is about two times as powerful as the 68000. The 68020 has 32-bit addressing and a 32-bit data bus and is available in various speeds like 16MHz, 20MHz, 25MHz, and 33MHz. The microprocessor 68020 is found in the original Macintosh II and in the LaserWriter IINT both of which are from Apple. The 68030 microprocessor was invented by Motorola about a year after the 68020 was released(Encarta 95). The 68030 has 32-bit

addressing and a 32-bit data bus just like it’s previous model, but it has paged memory management built into it, delaying the need for additional chips to provide 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 NeXT computer. 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). The 68040 has a 32-bit addressing and a 32-bit data bus just like the previous two microprocessors. But unlike the two previous microprocessors this one runs at 25MHz and includes a built-in floating point unit and memory management units which includes 4-KB instruction and data coaches. Which just happens to eliminate the need

additional chips to provide these functions. Also the 68040 is capable of parallel instruction execution by means of multiple independent instruction pipelines, multiple internal buses, and separate caches for both data and instructions. The microprocessor 68881 was invented by Motorola for the use with both microprocessor 68000 and the 68020(Encarta 95). Math coprocessors, if supported by the application software, would speed up any function that is math-based. The microprocessor 68881 does this by additional set of instructions for high- proformance floating point arithmetic, a set of floating-point data registers, and 22 built-inconstants including p and powers of 10. The microprocessor 68881 conforms to the ANSI/IEEE 754-1985 standard for binary floating-point arithmetic.