Apple Mac System 1
January 24, 1984 – Just over one year after Apple came out with an advanced, multitasking, graphical desktop computer...it decided to come out with a cheaper computer. So Apple created the Mac System Software, an operating system that looked roughly like that of the Lisa. It only lacked some of the more cutting-edge features, like multitasking. But it did have sound. Which was cool.
Fun Fact: The very first public release did not have an “About Box.” This was added with the first .”1” release a few months later.