plugboard - Computer Definition
A board containing a matrix of sockets used to program a machine. Plugboards were widely used in punch card tabulating machines and early computers and were the predecessor to software programming. For example, each wire in the board directs a column of data from its source column to its destination which could be a print column or a card column to be punched. A wire could also function as a switch by closing a circuit. Complicated programs looked like "mounds of spaghetti." See punch card.
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