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Preface iv
Best Friends 3 (6)
Codes and Combinations 9 (6)
Braille and Binary Codes 15 (7)
Anatomy of a Flashlight 22 (10)
Seeing Around Corners 32 (8)
Telegraphs and Relays 40 (7)
Our Ten Digits 47 (7)
Alternatives to Ten 54 (15)
Bit by Bit by Bit 69 (17)
Logic and Switches 86 (16)
Gates (Not Bill) 102(29)
A Binary Adding Machine 131(12)
But What About Subtraction? 143(12)
Feedback and Flip-Flops 155(25)
Bytes and Hex 180(10)
An Assemblage of Memory 190(16)
Automation 206(32)
From Abaci to Chips 238(22)
Two Classic Microprocessors 260(26)
ASCII and a Cast of Characters 286(15)
Get on the Bus 301(19)
The Operating System 320(15)
Fixed Point, Floating Point 335(14)
Languages High and Low 349(15)
The Graphical Revolution 364(19)
Acknowledgments 383(2)
Index 385

What do flashlights, the British invasion, black cats, and seesaws have to do with computers? In CODE, they show us the ingenious ways we manipulate language and invent new means of communicating with each other. And through CODE, we see how this ingenuity and our very human compulsion to communicate have driven the technological innovations of the past two centuries.

Using everyday objects and familiar language systems such as Braille and Morse code, author Charles Petzold weaves an illuminating narrative for anyone who’s ever wondered about the secret inner life of computers and other smart machines.

It’s a cleverly illustrated and eminently comprehensible story-and along the way, you’ll discover you’ve gained a real context for understanding today’s world of PCs, digital media, and the Internet. No matter what your level of technical savvy, CODE will charm you-