I used to design and build whole systems from TTL logic in the 70s and 80s. The most integrated part was the ALU from AMD, otherwise, it was mostly NAND and NOR

I used to design and build whole systems from TTL logic in the 70s and 80s. The most integrated part was the ALU from AMD, otherwise, it was mostly NAND and NOR gates. Great fun, especially cause we knew how everything worked.