Circuit Cellar Ink 27
June/July 1992

Table of Contents

2 Ken Davidson	Editor's INK Computing in Real Time
4	Reader's INK Letters to the Editor
8 Harv Weiner	New Product News
14 Mike Podanoffsky	Build a Real-Time Multitasking Executive Having several independent, concurrent tasks running on a real-time system often simplifies program development. Find out what it takes to put such a system together. Download: RTX.ZIP
22 Robert Scott	Resource Management in Cooperative Multitasking In applications where cooperation between tasks is necessary to get the job done, sharing hardware resources effectively can make the difference between a useful system and a useless system.
28 Francis Lyn	Using Programmable Logic Controllers We hear a lot about general-purpose microcontrollers used in embedded control situations, but what about the die-hard controllers that brave the hostile environment of the factory floor? Find out about PLCs. Download: TILE.ZIP
36 Dwayne Phillips	LZW Data Compression In this age of information, greater emphasis is being placed on fitting more on a disk and shortening data transfer times. Find out the ins and outs of one of the more popular data compression methods. Download: LZW.ZIP
50 John Dybowski	The Elements of a Data Logger Batteries, real-time clocks, power-control circuits, A/D converters -- they are all just as important as the microcontroller in a data logger. Find out what to look for when selecting data logger components. Download: LOG5000.ZIP LOG8031.ZIP
68 Ed Nisley	Firmware Furnace An HCS II LCD Terminal The Circuit Cellar HCS II interfaces well with real-world sensors and actuators, but what about the human interface? Ed shows us a simple LCD terminal that can be added anywhere in the system. Download: LCDLINK.ZIP
76 Jeff Bachiochi	From the Bench Computers on the Brain (revisited) Circuit simulation is becoming a more affordable design tool every day. Get inside Jeff's head as he takes a new look at a popular Ciarcia project.
84 Tom Cantrell	Silicon Update Multimedia Madness -- Couch Potato Computing RISC, CISC, PIC, fuzzy logic -- Tom has never been one to shy away from the latest buzzword. This time, he's tackling something we've all been hearing a great deal about: multimedia.
92 John Dybowski	Practical Algorithms Use a Watchdog to Keep Your Controller in Line A watchdog can be an invaluable aid in keeping a system completely reliable, but only when properly implemented. John gives some hints for what to do and what not to do.
97	Advertiser's Index
99 Ken Davidson	ConnecTime -- Excerpts from the Circuit Cellar BBS
112 Steve Ciarcia	Steve's Own INK Making "Sense" Of the World

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