Mac System 1.0

The very first version of the Macintosh system software, System 1.0, was released on January 24, 1984, with a size of just 216K and is the operating system that accompanied the Macintosh 128K.

It was made up of the desktop, windows, icons, folders, the menu bar, documents, applications, the trash (aka wastebasket), and system software. It could run only one application at a time and was black and white. LINK

Most of the icons and fonts were designed by Susan Kare.