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Definition: TOS


(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 It was superseded by DOS/360.