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

PDF 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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