because it has four internal register and four external data bus
The first microprocessor was the Intel 4004.
I believe it was the 4004 by Intel, later the 8008 and then the 8080
4004
hello
the intel 4004
improved version of 4004
4004
The Intel 4004 was the world's first microprocessor. It was designed in 1970.
4004 is the first general purpose microprocessor by Intel
The first microprocessor is invented by Intel that is 4004(its name.) in around 1970...
The Intel 4004, introduced in 1971.
1971!it was 4004!