Circuit Cellar Ink 233
December 2009

Table of Contents

4 CJ Abate	HTML Task Manager Looking Back While Moving Forward
8 John Gorsky	HTML New Product News
14 David Tweed	iMCU W7100 Embedded Networking Made Simple The hardware TCP/IP stack of the W5100 has been enhanced in the W7100 with the the addition of an on-chip 8051 application processor core, eliminating need for a separate processor chip in many applications. Here's an introduction to the new chip and an evaluation module that's based on it. Download: Tweed-233.zip
24 Stephen A. Edwards	Retrocomputing on an FPGA Reconstruct an '80s-Era Home Computer with Programmable Logic If you're interested in preserving legacy digital electronics and integrating them with modern systems, this article is for you. Get ready to reconstruct the venerable Apple II+ with programmable logic. Download: Edwards-233.zip
36 Thomas Mitchell	Building Microprogrammed Machines with FPGAs You can try microprogramming as an alternative to hardwired finite-state mcahines. Microprogrammed controllers are advantageous for numerous reasons, one of which is that FPGA implementations can be built without a finished microprogram. With this introduction to microprogramming, you're well on your way to a design that is easier to implement and maintain. Download: Mitchell-233.zip
Above the Ground Plane 44 Ed Nisley	Memories are Not Forever Are you having digital-related problems with a piece of bench-top equipment such as a spectrum analyzer? Some digital logic and firmware can be just the solution. Just keep in mind that something made only of bits won't last forever. Download: Nisley-233.zip
The Darker Side 54 Robert Lacoste	Digital Modulations Demystified Today's blinding data transmission speeds aren't due solely to advances in processor technology. Digital modulation plays an important role, although it can be a difficult topic to understand. What is digital modulation, and how does it factor into your designs? This article introduces the subject and demystifies the complex mathematics involved in the theory. Download: Lacoste-233.zip
From the Bench 64 Jeff Bachiochi	Extend and Isolate the I2C Bus When you have a multiple-board application -- such as a growing robotics design -- you can use the I2C bus to move data while keeping the wiring simple. This review of the I2C communication protocol shows why the uncomplicated architecture can make a complex project a little easier.
Silicon Update 70 Tom Cantrell	IP Unplugged Internet everywhere. Do you share that vision? Before you answer this question, consider 6LoWPAN, an adaptation layer between the Internet and a wireless sensor network.
74	Crossword Puzzle
79	Advertiser's Index / January Preview
80 Steve Ciarcia	HTML Priority Interrupt Home Automation: Everything and Nothing
Bonus Article 85 Monte Dalrymple	The Evolution of Rabbits Five Generations of Rabbit Microprocessors How do IC designers deal with changing technology? To answer that question, let's review the evolution of a processor family over time.

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