I just want to further encourage @mkglass to reach out to some preservation experts. If digging into your dad’s past feels like a big stressor a museum might even be able to take care of some of the labor for you or boil it down to just interviewing you or something.
To give you some idea of the significance of this (if you don’t already know), almost every every video game history book or article tends to mention “the first Easter Egg” in Adventure for the Atari 2006.
This kind of thing is considered a little bit more than an oddity, because it harkens to a historical period when game designers/coders were actively told they were not allowed to “sign” their work. Easter Eggs like these are seen as the first push by game creators to acknowledge that they were doing something creative–that their work has meaning beyond a temporary novelty. As it turns out, they were right: and many smaller games are well remembered as stepping stones to the the mature medium we have today.
I don’t want to pump you up too much: Adventure is also remembered because it was a very influential game, so to most gamers (even those weird enough to really care about video game history), your dad will probably be a curious footnote or trivia question. However, we don’t know what historians might find. If someone wants to write a book about the Channel F, knowing about your dad could unlock everything. Maybe his name will help find a coworker who’s still living. Maybe we can find out exactly what was going on in those offices way back when. It would be interesting!
So yeah: I’m sure whatever firsthand access you can offer would be really interesting to the right preservationist. And if you need help making those connections some peeps on here or Reddit can likely help!