System 1

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Macintosh "System 1"

Version of the classic Mac OS operating system
The original "System 1" desktop
Developer	Apple Computer
OS family	Macintosh
Source model	Closed source
Released to manufacturing	January 24, 1984; 40 years ago (1984-01-24)
Latest release	1.1 / December 29, 1984; 39 years ago (1984-12-29)
Kernel type	Monolithic
License	Proprietary
Succeeded by	System 2
Support status
Architectural, unsupported

Part of a series on
Classic Mac OS
Versions System 1 System 2, 3, and 4 System 5 System 6 System 7 Mac OS 7 Mac OS 8 Mac OS 9
Applications Calculator Chooser Drive Setup DVD Player Finder Graphing Calculator Keychain Access PictureViewer PowerTalk QuickTime Player Network Browser Scrapbook Sherlock Software Update Stickies System Information SimpleText
Developer HyperCard MacsBug Macintosh Programmer's Workshop ResEdit
Technology Alias Appearance Manager Apple menu At Ease Balloon help Bomb error Command key (⌘) Control Panel Control Strip Creator code Dogcow Extensions Hierarchical File System HFS Plus Keychain Labels Macintosh File System Macintosh Toolbox Managers MultiFinder Option key (⌥) OSType PICT QuickDraw QuickTime Resource fork Sosumi sound Startup sequence System folder System suitcase Type code WorldScript
Related Memory management Old World ROM New World ROM Software
v t e

The Macintosh "System 1" is the first major release of the classic Mac OS operating system. It was developed for the Motorola 68000 microprocessor. System 1 was released on January 24, 1984, along with the Macintosh 128K, the first in the Macintosh family of personal computers. It received one update, "System 1.1" on December 29, 1984, before being succeeded by System 2.^[1]