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AI-1 APPENDIX I GLOSSARY ADDEND A number to be added to an augend. ADDITION A form of counting where on quantity is added to another. AND GATE A logic circuit in which all inputs must be HIGH to produce a HIGH output. ASSOCIATIVE LAW A simple equality statement A(BC) = ABC or A+(B+C) = A+B+C. AUGEND A number to which another number is to be added. BASE The number of symbols used in the particular number system. BCD (BINARY CODED DECIMAL) A method of using binary digits to represent the decimal digits 0 through 9. BINARY SYSTEM The base 2 number system using 0 and 1 as the symbols. BOOLEAN ALGEBRA A mathematical concept based on the assumption that most quantities have two possible conditions TRUE and FALSE. BOOLEAN EXPRESSION A description of the input or output conditions of a logic gate. BORROW To transfer a digit (equal to the base of the number system) from the next higher order column for the purpose of subtraction. CARRY A carry is produced when the sum of two or more numbers in a vertical column equals or exceeds the base of the number system in use. CLOCK A circuit that generates timing control signals in a computer or other type of digital equipment. COMMUTATIVE LAW The order in which terms are written does not affect their value; AB = BA, A+B = B+A. COMPATIBILITY The feature of logic families that allows interconnection of circuits without the need for additional circuitry. COMPLEMENT Something used to complete something else. COMPLEMENTARY LAW A term ANDed with its complement is 0, and a term ORed with its complement is 1; A A   = 0, A + A   = 1. CONVERSION To change a number in one base to its equivalent in another base. COUNTER A device that counts. D FLIP-FLOP Stores the data bit (D) in conjunction with the clock input. DECADE COUNTER Counter from 0 to 1010 in base 2, then resets. DECIMAL POINT The radix point for the decimal system.