1 Best Friends 2 Codes and Combinations 3 Braille and Binary Codes 4 Anatomy of a Flashlight 5 Seeing Around Corners 6 Telegraphs and Relays 7 Our Ten Digits 8 Alternatives to Ten 9 Bit by Bit by Bit 10 Logic and Switches 11 Gates (Not Bill) 12 A Binary Adding Machine 13 But What About Subtraction? 14 Feedback and Flip-Flops 15 Bytes and Hex 16 An Assemblage of Memory 17 Automation 18 From Abaci to Chips 19 Two Classic Microprocessors 20 ASCII and a Cast of Characters 21 Get on the Bus 22 The Operating System 23 Fixed Point, Floating Point 24 Languages High and Low 25 The Graphical Revolution Acknowledgments Index
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