Here's the BBS documentary miniseries - worth a watch either for nostalgia or learning about how electronic communication worked pre-internet: https://archive.org/details/BBS.The.Documentary
To be completely accurate, it's not pre-internet so much as parallel to the Internet pre-Eternal September. There was a whole culture of PCs (of various architectures) BBSs, freeware, shareware, etc. that was pretty much independent of--and was largely unaware of--the fairly insular proto-Internet.