Atari_TOS Atari_TOS

Atari TOS - Definition and Overview

The Operating System (TOS) was the operating system of the Atari ST range of computers. This range included the 512ST, 1040ST and the F, FM and E variations (e.g.1040STE). Later, 32-bit machines (TT, Falcon030) were developed using a new version of TOS, called MultiTOS which was based on MiNT.

Atari ST GEM desktop
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Atari ST GEM desktop

TOS combined Digital Research's GEM GUI running on top of the DOS-like GEMDOS. Features included a flat memory model, MS-DOS-compatible disk format and support for MIDI and a variant of SCSI called ACSI (in later versions).

There is some argument as to what TOS stands for, the main candidates being "Tramiel Operating System" (named after Atari's head at the time) or simply "The Operating System".

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