The Evaluation Of The Microprocessor Essay Research

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. When making the Macintosh II, Apple noticed that when they added a

68881, the improvement in performance of the interface, and thus the apparent

performance was changed dramatically. Apple then decided to add it as standard

equipment.

The microprocessor 80286, also called the 286was invented by Motorola in

1982(Encarta 95). The 286 was included in the IBM PC/AT and compatible

computers in 1984. The 286 has a 16-bit resister, transfers information over

the data bus 16 bits at a time, and use 24 bits to address memory location. The

286 was able to operate in two modes real (which is compatible with MS-DOS and

limits the 8086 and 8088 chips) and protected ( which increases the

microprocessor’s functionality). Real mode limits the amount of memory the

microprocessor can address to one megabyte; in protected mode, however the

addressing access is increased and is capable of accessing up to 16 megabytes of

Внимание, отключите Adblock

Вы посетили наш сайт со включенным блокировщиком рекламы!
Ссылка для скачивания станет доступной сразу после отключения Adblock!

Скачать