IBM 5150 Hardware Reference Manual page 365

70. OR: A logic operator having the property that if P is a
statement, Q is a statement, R is a statement. .., then the OR of
P,Q,R, is true if at least one statement is true, false if all
statements are false. P OR Q is often represented by P+Q,
PVQ. The term is synonymous with boolean add; logic add.
71. "ORed": Past tense of OR.
72. OSC: Oscillator. (Refer to System Board I/O Channel
Descriptions).
73. Output: Pertaininng to a device, process, or channel involved in
an output process, or to the data or states involved in an output
process.
74. Personal Computer: A small home or business computer
complete with a System Unit, keyboard, and available with a
variety ofoptions such as monochrome display and a dot matrix
printer.
75. Pinout: A diagram of functioning pins on a pinboard.
76. Printed Circuit Board: A piece of material, usually fiberglass,
which contains a layer of conductive material, usually metal.
The metallic layer is then etched and electronic equipment is
then attached to the fiberglass. The electronic equipment then
has the capacity to transmit electronic signals through the board
by way of the etched metal tracks.
77. Program: (1) A series of actions designed to achieve a certain
result. (2) To design, write and test computer programs.
78. Read/Write Memory: Random access storage.
79. Reset Drv: Reset Driver. (Refer to System Board I/O Channel
Descriptions).
80. RF Modulator: The device used to convert the composite video
signal to the antenna level input of a home TV.
81. ROM: Read-only Memory.
82. ROM BIOS: Read-only Memory/Basic Input Output System.
83. RS 232 Port: Asynchronous Type Communications.
84. RTS: Ready to Send. Associated with modem control.
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