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(computer science)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


(operating system)

1. IBM's Tape Operating System.

2. 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 and MegaSTE) were developed using a new version of TOS, called MultiTOS which was based on MinT.

TOS went through several revisions starting initially as a derivative of CP/M, but developing into a remarkably complete and flexible operating system. Features include: a flat memory model, MS-DOS-compatible disk format and support for MIDI and SCSI (in later versions). TOS was designed to run Atari's version of the GEM GUI.

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".

3. <networking> Terms Of Service.

4. Star Trek The Original Series as opposed to ST-TNG or ST-DS9.
This article is provided by FOLDOC - Free Online Dictionary of Computing (


(1) See terms of service.

(2) (Type Of Service) A field in an IP packet (IP datagram) that is used for quality of service (QoS). The TOS field is 8 bits, broken into five subfields.

(3) (Tape Operating System) An OS for IBM's System/360 Model 30 in the mid-1960s. It was superseded by DOS/360.
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References in periodicals archive ?
Yucel et al8 found higher concentrations of TOS and OSI in SCF patients.
These subgroups were compared with respect to TAS, TOS, and OSI values.
Tos has also been the Honorary Member of the Balkan Society of ORL&HNS and the Trakya Society of ORL&HNS.
We presented the case of a patient with HME presenting with TOS as a symptom of secondary malignant change in osteochondroma.
TOS is a disorder caused by compression of the brachial plexus and/or subclavian vessels between the clavicle and first rib, an anatomical region known as the thoracic outlet or an acute compartment syndrome occurred within the thoracic outlet.[7] The diagnosis of TOS is based on a physician's judgment after a meticulous history taking and physical examinations.[7],[8],[9] The vast majority of TOS cases are neurogenic (>95%), with an arterial cause identified in 1% of cases.
TOS levels were measured with fully automated Rel Assay kit (Rel Assay Diagnostics kit; Mega Tip, Gaziantep, Turkey) using colorimetric and an autoanalyzer (Vital Scientific, Selectra/Flexor E, Hollanda).
The next step is to draw a distinction in your ToS between your basic and advanced support policies.
La identificacion de hidrotorax suele ser sencilla, ya que la clinica manifestada por los paciente habitualmente es tos, disnea y descenso de volumen de drenaje.
TOS of plasma was measured using a novel automated colorimetric measurement method for TOS developed by Erel (8).
Minister Bathiudeen also ordered the TOs to study their respective FMCG markets, find essential consumer item prices and get back to the DoC with details.