Engine control alone can be self-contained. The Ford EEC IV of the 1980s had its program permanently etched into the Intel 8061 CPU, and was designed to last 30

Engine control alone can be self-contained. The Ford EEC IV of the 1980s had its program permanently etched into the Intel 8061 CPU, and was designed to last 30 years. It did. I finally sold off my 40 year old Ford Bronco, which was still running on the original engine and CPU.