The question on the OS got me thinking.
How did OS worked on “intermediate device”. by that I mean stuff that are too advanced to be just a few logical gates and EPROM, but before the time where most electronic devices are a computer running Linux
Stuff like phone from the 00’s before android, digital camera, washing machine and other devices which were already quite advanced (Some could already run java) but not at the point to be “just an embedded computer running some hardware” Did they already had an OS ? Was it a minimalist home-made one bought to a third party ? Or was it still mostly working by counting bytes and drawing truth table ?
The ruling cellphone OS before Android and iOS was Symbian. Java was often used for apps. But when smartphones got more and more popular Symbian couldn’t keep up.
Apart from that there was Blackberry’s OS, Windows Mobile and Palm OS. And probably some others.
Just to add- Symbian didn’t rule in the same way android and ios do these days. There were more overall OSs on the market