No documentation, imagine! The original designers--dead. This person had to reverse engineer every aspect of that system, though I can't imagine that it has more than, say, 64KB of RAM. Still an enormous amount of work but not like trying to figure out how an iPhone works without any documentation.
Incredible that we can still receive the signal after all this time over such a vast distance. I wish we made our current devices with such longevity in mind 😉😄
Voyager is the Nokia of space probes: practically obsolete, code written in ancient runes almost nobody can still decipher and read... yet still keeps on ticking.
They're basically rewriting the software, and if it goes horribly wrong, the probe will just stop talking forever. So no one was in a big rush to push this into production.
The announcement that Voyager 1’s instruments were returning data again came two days after JPL announced the passing of Ed Stone, who served as Voyager’s project scientist from the mission’s inception in 1972 until 2022.