Circuit Cellar Ink 26
April/May 1992

Table of Contents

2 Ken Davidson	Editor's INK Divide and Conquer
4	Reader's INK Letters to the Editor
8 Harv Weiner	New Product News
14 Jim Butler	Embedded Controller Networking Alternatives Distributed control systems rely on network communications to exchange data and keep processes coordinated. There are numerous networking options available; the best depends on your application.
22 Steve Ciarcia	Infrared Tracking and Remote Control Meet the New HCS II IR-Link Images of Big Brother accompany the idea of your house following your every move. Put Steve's people tracking system to good use as part of the new Circuit Cellar Home Control System. Download: IRLINK.ZIP
34 Frank Cox	The Frugal Networker A Crosspoint Switchboard for RS-232 How many times have you wanted to be able to easily switch two or three computers between, say, a printer, two modems, and a microcontroller? Find out how to do it easily using a telephone chip. Download: FRUGAL.TXT
42 Ken Davidson	Programming the Home Control System II In the last issue of Circuit Cellar INK, members of the engineering staff introduced the Circuit Cellar HCS II. Find out now how to program the system to run your home.
52 Peter Hiscocks	State Machines in Software A Design Technique for Single-Chip Microprocessors State machines are commonly built in hardware using discrete logic. Explore the use of similar techniques for embedded software.
62 Edward Oscarson	Programming the Motorola MC68HC705C8 Most low-cost, stand-alone EPROM programmers can't handle microcontrollers with on-chip EPROMs. What's a developer to do? Use the chip to program itself; Edward show us how. Download: PROG7B.ZIP BURN05.ZIP
70 Ed Nisley	Firmware Furnace Infrared Home Control Gateway You can already control you TV, VCR, and CD player from the comfort of your chair using a hand-held infrared remote. Why not control your home as well? Ed shows us the firmware involved in doing just that.
78 Jeff Bachiochi	From the Bench Does It Come With a Memory ... Standard? -- Part 2 -- The Nitty-Gritty In the last issue, Jeff introduced us to the PCMCIA memory card standard. This time, he shows us how to build an interface that should stand the test of time (assuming the standard does, too). Download: MEMCARD.ZIP
84 Tom Cantrell	Silicon Update Twenty Years of Micros -- Now What? The computer industry has come a long way in the last twenty years. One of the more esoteric technologies to be developed is fuzzy logic. Tom takes another look at this somewhat ticklish subject.
92 John Dybowski	Practical Algorithms Writing Code to Support Nonvolatile Memory Designing a system to survive an unexpected power loss may seem as easy as adding a battery backup to the RAM. However, making a truly bullet-proof system often requires more safeguards.
97	Advertiser's Index
99 Ken Davidson	ConnecTime -- Excerpts from the Circuit Cellar BBS
112 Steve Ciarcia	Steve's Own INK A Night in the Life

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