Classic Mac OS

"Classic" Mac OS refers to a discontinued operating system that was developed by Apple Computer for use in its Macintosh product line. It has since been superseded by Mac OS X (now called macOS).

Release history

 * System 1, released January 24, 1984 (MacroMind MusicWorks is known to be supported on all systems; MacroMind VideoWorks requires at least 512 KB of RAM)
 * System 2, released April 1985
 * System 3, released January 1986
 * System 4, released January 1987
 * System 5, released October 1987
 * System 6, released April 1988 (MacroMind Director 1.0 was supported from System 6.0.2)
 * System 7, released May 13, 1991
 * Mac OS 8, released July 26, 1997
 * Mac OS 9, released October 23, 1999