Back before the PC, didn't IBM and some other mainframe companies try to lease out terminals? This in that you could get a terminal on your home desk, that either via dedicated line or basic dialup would connect to a mainframe where you paid minute or something?
In a sense the web browser, and SaaS, has become a reinvention of that...
A popular (for the time) example of this type of service was CompuServe (https://en.wikipedia.org/wiki/CompuServe). I had my first online experience connecting to CompuServe on my family's home PC, back in 1985.
In a sense the web browser, and SaaS, has become a reinvention of that...