> If you look at the 74 TTL series dies, they look almost primitive. But perhaps these were one of the first attempts at ICs... TTL wasn't the first attempt at

> If you look at the 74 TTL series dies, they look almost primitive. But perhaps these were one of the first attempts at ICs... TTL wasn't the first attempt at ICs. Before TTL, there was RTL: https://en.wikipedia.org/wiki/Resistor%E2%80%93transistor_logic https://en.wikipedia.org/wiki/Resistor%E2%80%93transistor_lo...