Evolution of Microprocessor | Evolution of the Intel Microprocessor

Описание: #microprocessor #evolution_of_Microprocessor
The 4004 made a name for Intel in the microprocessor business, and to capitalize on the situation, Intel introduced a new line of eight-bit processors. The 8008 came first in 1972, followed by the 8080 in 1974 and the 8085 in 1975. ... The 8008 used 10-micrometer transistor technology. Intel's 8080 was far more successful.
Evolution of the Intel Microprocessor
Intel's first 16-bit processor was the 8086, which helped to boost performance considerably compared to earlier designs. Not only was it clocked higher than the budget-oriented 8088, but it also employed a 16-bit external data bus and a longer six-byte prefetch queue. It was also able to run 16-bit tasks (though most software at this time was designed for eight-bit processors). The address bus was extended to 20-bit, which enabled the 8086 to access up to 1MB of memory and therefore increase performance.

The 8086 also became the first x86 processor, and it used the first revision of the x86 ISA, which nearly all of the processors created by AMD or Intel since the introduction of the 8086 have been based on.

Intel also produced the 8088 around the same time. This processor was based on the 8086, but with half as many data lines and a four-byte prefetch queue. This caused a loss of balance, as the narrower bus cut into instruction fetch rate, forcing Intel's execution unit to idle much of the time. It still had access to up to 1MB of RAM and ran at higher frequencies than previous processors; however, it was quite a bit slower than the 8086.