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TOS (The Operating System also Tramiel Operating System from Jack Tramiel, owner of Atari Inc. at the time) is the operating system of the Atari ST range of computers. This range includes the 520 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. ==Details== The Atari TOS (The Operating System) debuted with the Atari 520ST in 1985. TOS combines Digital Research's GEM GUI running on top of the DOS-like GEMDOS. Features include a flat memory model, MS-DOS-compatible disk format, support for MIDI, and a variant of SCSI called ACSI in later versions. Atari's TOS is usually run from ROM chips contained in the computer: Thus, before local hard drives were available in home computers, it was an almost instant-running OS. TOS booted off floppy disks in the very first STs, but only about half a year after the ST was introduced, all ST models started shipping with the latest version of TOS in ROM.〔(The Unofficial XaAES Page )〕 ''TOS'' consisted of the following: *Desktop - The main interface loaded after bootup. *GEM - Graphical Environment Manager, licensed from Digital Research * *AES - Application Environment Services * *VDI - Virtual Device Interface (screen drivers only, other drivers loaded using GDOS) *GEMDOS - GEM Disk Operating System *BIOS - Basic Input/Output System *XBIOS - Xtended BIOS *Line-A - Low-level high-speed graphics calls. Obsolete The following were extensions to ''TOS'' (loaded separately): *GDOS - Graphics Device Operation System *AHDI - Atari Hard Disk Interface (driver for Hard Drive) True multitasking was not directly supported, but ''TOS'' allowed up to six desk accessories to be loaded into the system, which are similar to TSRs (Terminate and Stay Resident) on PCs. MultiTOS was developed to allow ''TOS'' to preemptively multitask. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Atari TOS」の詳細全文を読む スポンサード リンク
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