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USB Explained by Martin D. Seyer, Steven McDowell

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Chapter 2USB Concepts

Why a New Serial Port?

The Universal Serial Bus (USB) comes to us at a time when serial-port technology has hit a brick wall, in terms of both how much information can be sent to serial devices and how many serial devices one can attach to a modern PC. The advent of multimedia and the proliferation of relatively inexpensive processing power have left the venerable RS-232 serial port that you are used to working with a relic of times past.

Today, technology can deliver digital joysticks for high-precision game playing. Today’s technology can also deliver digital audio peripherals, eliminating sounds cards and other analog audio equipment from within the PC. It can provide high-resolution “live” video input and output devices. ...

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