IBM 5150 Hardware Reference Manual page 366

85. Scan Line: The use of a cathode beam to test the cathode ray
tube of a display used with a personal computer.
86. Schematic: The description, usually in diagram form, of the
logical structure and physical structure of an entire data base
according to a conceptual model.
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87. Software: (1) Computer programs, procedures, rules, and
possibly associated documentation concerned with the opera­
tion of a data processing system. (2) Contrast with hardware.
88. Strobe: (1) An instrument used to determine the exact speed of
circular or cyclic movement. (2) A flashing signal displaying an
exact event.
89. Text: In ASCII and data communication, a sequence of
characters treated as an entity if preceded and terminated by
one STX and one ETX transmission control respectively.
90. TX Data: Transmit Data. External connections ofthe RS 232
Asynchronous Communications Adapter interface.
91. Video: Computer data shown or displayed on a cathode ray
tube monitor or display.
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