Despite what its naming suggests, the Intel 8008 was developed independently of the [[Intel 4004]]. They were separate projects with distinct architectures and purposes, not a progression or derivative of one another.
Fun fact: Before microprocessors were invented, there was already ALU chips like the 74181 ALU chip that were used in CPU boards. [https://www.righto.com/2017/01/die-photos-and-reverse-engineering.html Source ]
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