INDEX-3 Special logic circuits, 3-1 adders, 3-5 clocks and counters, 3-22 exclusive NOR gate, 3-4 exclusive OR gate, 3-3 flip-flops, 3-12 introduction, 3-1 logic families, 3-39 registers, 3-32 summary, 3-42 Subtraction, 3-11 binary numbers, 1-16 hex numbers, 1-34 octal numbers, 1-27 Synchronous counter, 3-26 T Toggle flip-flop, 3-16 Truth Table, 2-7, 2-11, 2-16, 2-17 AND gate, 2-6 NAND gate, 2-14 NOR gate, 2-16 OR gate, 2-10 TTL (transistor-transistor logic), 3-41 Types of number systems, 1-2 U Unit and number, 1-3, 1-9, 1-23, 1-30 V Variations of fundamental gates, 2-18 Z Zero and positional notation, 1-3