A storage device that, after being written to once, becomes a read-only memory.

1. The part of digital equipment that controls the timing and sequencing of operations.
2. A person who prepares computer programs, i.e., writes sequences of instructions for execution by a computer.

An artificial language that is used to generate or to express computer programs.
Note: The language may be a high-level language, an assembly language, or a machine language.

The interface between applications and application platforms traditionally associated with programming language specifications, such as program control, math functions, string manipulation, etc [POSIX.0].

One or more programming languages and the software necessary for using these languages with particular automatic data processing equipment.

A joint effort of U. S. Federal, state, and local governments to develop standards for interoperable digital, narrowband radios to meet public-safety user needs.
Note: Secondary objectives of Project 25 include obtaining maximum radio spectrum efficiency, ensuring competition throughout the life of the systems.

Acronym for programmable read-only memory.

1. In interactive display systems, a message on the display surface of a display device to help the user to plan and execute subsequent operations.
Note: Examples of prompts include (a) a blinking message displayed on a screen to inform the system operator of the status, condition, or mode the system is in and requiring the operator to take some… (Read More →)

The motion of waves through or along a medium.
Note: For electromagnetic waves, propagation may occur in a vacuum as well as in material media.

1. For an electromagnetic field mode varying sinusoidally with time at a given frequency, the logarithmic rate of change, with respect to distance in a given direction, of the complex amplitude of any field component.
Note: The propagation constant, , is a complex quantity given by = +i, where , the real part, is the attenuation constant and , the… (Read More →)