Atari TOS
| MultiTOS 1.0 with various programs provided by Atari in the background | |
| Developer | Atari Corporation | 
|---|---|
| Working state | Discontinued | 
| Initial release | 20 November 1985 | 
| Latest release | 4.04 | 
| Latest preview | 4.92 | 
| Platforms | Motorola 68000 | 
| Default user interface | GEM | 
| License | Proprietary commercial software | 
| Succeeded by | MultiTOS | 
TOS (The Operating System) is the operating system of the Atari ST range of computers. This range includes the 520ST and 1040ST, their STF/M/FM and STE variants and the Mega ST/STE. Later, 32-bit machines (TT, Falcon030) were developed using a new version of TOS, called MultiTOS, which allowed multitasking. More recently, users have further developed TOS into FreeMiNT.