Back in 1982 Joe Jacobs and Dennis Clark put together a personal version of PlayCable, called PlayComp. This used PDP-11 computers they had at home to "broadcast" games over a serial connection to their development kits based on Jerrold PlayCable adapters.
Media Links:
youtu.be/BsxYrpuXoEg
Source Links:
atariage.com/forums/topic/331114-a-recreation-of-playcomp-the-best-variant-of-playcable/