History Of Cpu

The history of the central processing unit of the CPU goes back to the 1970s. In November 1971, the first single chip CPU of its kind was developed by Intel. It was called the Intel 4004. This CPU processed data into four bits. The program and the corresponding data were different.

In 1972, Texas Instruments made the TMS 1000, the first microprocessor to have sufficient RAM or Random Access Memory. It also had space for a program ROM or Read Only Memory. Because of this, it could continue to function without multiple external support chips.

The 8008 invented in 1972, consisted of a 14 bit PC and addressing. It consisted of a 16 bit address bus and an 8 bit data bus. In 1976, this design was updated by Intel with the 8085. This required two instructions to enable or disable. It also had three added interrupt pins, serial I/O pins. It used only +5V power.

In 1976, the Z-80 was invented as the successor of the 8080. It had 80 more instructions than the 8080. It also had two banks of data registers that could be switched between. After this, the next invention was made by Motorola. They introduced the 6800 in 1975. The model after this was 6809. It consisted of two 8 bit accumulators which could be joined into a single 16 bit register. It also had an 8 bit Direct Page register. This allowed you to locate the fast address page anywhere in the 64k address space provided.

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