1. A memory in which data, under normal conditions, can only be read. Synonym nonerasable storage.2A storage area in which the contents can be read but not altered during normal computer processing [TCSEC].

A storage device in which the contents cannot be modified, except by a particular user, or when operating under particular conditions, e.g., a storage device in which writing is prevented by a lockout. Synonym fixed storage.

Synonym read/write slot.

An opening in the jacket of a diskette to allow access to the read/write heads. Synonym read/write opening.

The acquisition or interpretation of data from a storage device, from a data medium, or from another source.

1. A call-control signal that is transmitted by the data circuit-terminating equipment (DCE) to the data terminal equipment (DTE) to indicate that the connection is available for data transfer between both DTEs.
2. A signal that (a) is sent in the backward direction in the interexchange data channel, to indicate that all the succeeding exchanges involved in the connection have… (Read More →)

See effective power.

1. The actual time during which a physical process occurs.
2. Pertaining to the performance of a computation during the actual time that the related physical process occurs, in order that results of the computation can be used in guiding the physical process.

A set of on-demand procedures based on which the communication can be started in relatively short time (i.e., on the order of few seconds) after the request is made. [T1.606-1990]

RTT is text transmitted character-by-character in real time with the intent of being displayed immediately to the receiving person(s).