[rasz]

>Does a 1980's Datsun have an ECU?

of course https://www.classiczcars.com/forums/topic/63812-1980-280zx-e...

picture https://www.electro-tech-online.com/attachments/4-ecu-full-s... a ton of Hitachi chips, big one on top seems to be some kind of ADC.

https://en.wikipedia.org/wiki/JECS build on BOSH license using Hitachi HD46802P (Motorola 6802 clone). Here reverse engineered https://github.com/eccs-reengineering/280ZX-Turbo-ECCS

Bosh shipped analog controlled d-jetronic in 1967 based on US patents/designs from fifties https://jetronic.org/index.php/en/d-jetronic/51-history.

Afaik first mass produced digital ECU was shipped by GM in 1978 (Motorola 6802 based). Ford also shipped some Toshiba ECUs in 1979. Bosh first fully digital ECU (Intel 8051 based) was https://en.wikipedia.org/wiki/Motronic in 1979 like Datsun/Nissan. Ford went full ECU in 1983 (https://en.wikipedia.org/wiki/Intel_8061)