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A form of signed binary notation in which negative numbers are created by complementing all bits of a number, including the sign bit 


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A form of signed binary notation in which negative numbers are created by adding 1 to the 1’s complement form of the 


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TTLcompatible IC that can be wired to operate in several different modes, such as a oneshot and an astable multivibrator. 


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Two cells in a Kmap are adjacent if there is only one variable that is different between the coordinates of the two cells. 


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The instantaneous voltage of a waveform. Often used to mean maximum amplitude, or peak voltage, or a pulse. 


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A way of representing some physical quantity, such as temperature or velocity, by a proportional continuous voltage or current. An analog voltage or current can have any value within a defined range.




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Digital circuit that implements the AND operation. The output of this circuit is HIGH only if all of its inputs are HIGH. 


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A mathematical function is associative if its operands can be grouped in any order without affecting the result. For example, addition is associative ((a+b) + c = a + (b+c)), but subtraction is not ((ab) –c ≠ a(bc)). 


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Type of counter in which each flipflop output serves as the clock input signal for the next flipflop in the chain. 


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Flipflop inputs that can affect the operation of the flipflop independent of the synchronous and clock inputs. 


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The smallest particle of an element that still has the same characteristics as the element. 


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Beginners' Allpurpose Symbolic Instruction Code. 


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Modifier in PBASIC that designates a variable as being a binary bit. 


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Group of flipflops connected in a special arrangement in which the states of the flipflops represent the binary number equivalent to the number of pulses that have occurred at the input of the counter. 


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A number system used extensively in digital systems, based on the number 2. It uses two digits to write any number. 


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Smallest number in binary. Can only have the value of 0 or 1. 


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Algebraic process used as a tool in the design and analysis of digital systems. In Boolean algebra only two values are possible, 0 and 1. 


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An algebraic expression made up of Boolean variables and operators, such as AND (), OR (+), or NOT (). Also referred to as Boolean function or a logic function. 


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Rules that can be applied to Boolean algebra to simplify logic expressions. 


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A variable having only two possible values, such as HIGH/LOW, 1/0, On/Off, or True/False. 


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A circuit board for wiring temporary circuits, usually used for prototypes or laboratory work. 


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A circle in a state diagram containing the state name and values of the state variables. 


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8 bits. Can have values in range from 0 to 255. 


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16 bits. Can have values from 0 to 65,535. 


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Counter that can count up or down depending on how its inputs are activated. 


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Counter that counts upward from 0 to a maximum count. 


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An electrical device used to store electrical charge. 


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The smallest unit of Karnaugh map, corresponding to one line of a truth table. The input variables are the cell’s coordinates and the output variable is the cell’s contents. 


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Digital signal in the form of a rectangular pulse train or a square wave. 


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Type of flipflop in which the D (data) input is the synchronous input. 

