[shiroiuma]

These spacecraft don't have CPUs, at least not the way we think of them, in the sense of a single microprocessor IC. Their "CPUs" are built from discrete logic gates on CMOS and TTL ICs, the way the earliest digital arcade games were.

https://en.wikipedia.org/wiki/Voyager_program#Computers_and_...

[varjag]

The concept of CPU predates micro-processors. They were cabinet sized originally.