Don't know why, but the CatChurn game jumped out at me as being written by Yahoo Software in 1982 (the year I was born). There does not seem to be a Wikipedia entry for this company, but the address appears to be a residential condo as per Google Maps - https://www.google.com/maps/place/10970+Ashton+Ave,+Los+Ange....

Interesting to see a little bit of history and how game writers really were working from home on an idea even in the early days.