Appendix I Glossary

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