Intel 8080

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The Intel 8080 was an early microprocessor designed and manufactured by Intel. The 8-bit microprocessor was released in April 1974 running at 2 MHz (at up to 500,000 instructions per second), and is sometimes considered to be the first truly usable microprocessor.

The 8080 was implemented using non-saturated enhancement-load NMOS, demanding extra voltages.

Contents

Description

Programming model

The Intel 8080 was the successor to the 8008. It used the same basic instruction set as the 8008 (developed by Computer Terminal Corporation) and was source code compatible with its predecessor, but added some handy 16-bit operations to the instruction set as well. The 8080's large 40-pin DIP packaging permitted it to provide a 16-bit address bus and an 8-bit data bus, allowing easy access to 64 kilobytes of memory.

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