System 1

"System 1", originally named Macintosh System Software, was the first Apple Macintosh operating system and the beginning of the classic Mac OS series. It ran on the Motorola 68000 microprocessor. System 1 was released on January 24, 1984, along with the original Macintosh, the first in the Macintosh family of personal computers. It received one update, "System 1.1" on May 5, 1984, before being succeeded by System 2.

System 1

"System 1", originally named Macintosh System Software, was the first Apple Macintosh operating system and the beginning of the classic Mac OS series. It ran on the Motorola 68000 microprocessor. System 1 was released on January 24, 1984, along with the original Macintosh, the first in the Macintosh family of personal computers. It received one update, "System 1.1" on May 5, 1984, before being succeeded by System 2.