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Terminology Continued
PCB: (Printed Circuit Board) the flat board that is lined with copper conductors and is designed to support and connect the modular chips.
Vss, 0 volts, ground, low, 0: The terms used to refer to a signal in the binary state zero.
Vcc, 5volts, high, 1: The terms used to refer to a signal in the binary state one. (CMOS technology operates on 3.3volts; TTL operates at 5volts typ.)