See: [https://www.righto.com/2016/12/die-photos-and-analysis-of_24.html Die photos and analysis] [https://www.righto.com/2017/02/reverse-engineering-surprisingly.html The ALU] [https://www.righto.com/2017/03/analyzing-vintage-8008-processor-from.html The counters] [https://www.righto.com/2020/11/reverse-engineering-carry-lookahead.html The carry-lookahead circuit] 8008 microprocessor reverse engineered
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] . And creating a 16-bit ALU was just a matter of combining four 74181 ALU chips with a 74182 lookahead carry chip. [http://www.6502.org/users/dieter/a7/a7_3.htm Source].
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