Decades ago I got involved in another interesting project: let’s build our own file server operating system on top of Z80 CPU. Yes, I was at university (how did you guess?) and No, it never really took off.
After I completed the LAN-over-RS-232 project, it was obvious (well, not in retrospect) that the solution to every problem must be Z80 computers connected with some crazy RS-232 wiring. A few years later we had to write an application to support rally races. Guess what the solution was ;)
It was early 1980s and I was just entering my MacGyver phase when someone asked me “could you make a local area network out of RS-232-based shared bus?” Sure, why not, it can’t be that hard…