PPT Slide

1 – Introduction

© 1996 Gaetano Borriello

Mapping from physical world to binary world

21

Technology State 0 State 1

Relay logic Circuit Open Circuit ClosedCMOS logic 0.0-1.0 volts 2.0-3.0 voltsTransistor transistor logic (TTL) 0.0-0.8 volts 2.5-5.0 voltsFiber Optics Light off Light on

Dynamic RAM Discharged capacitor Charged capacitor

Nonvolatile memory (erasable) Trapped electrons No trapped electrons

Programmable ROM Fuse blown Fuse intact

Bubble memory No magnetic bubble Bubble present

Magnetic disk No flux reversal Flux reversal

Compact disc No pit Pit

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