Circuit Cellar Ink 53
December 1994

Table of Contents

2 Ken Davidson	Editor's INK Putting the Cart Before the Horse
6	Reader's INK Letters to the Editor
8 Harv Weiner	New Product News
12 David Tweed	Designing Real-time Embedded Software Using State-machine Concepts Dave takes us back to the fundamentals of state-machine programming. His point: viewing real-time programming in the same way as state-machine programming gives greater clarity to the design process.
20 David Rodgers Peretz Tzarnotzky	All Together Now Writing Multiuser Application Software for ACCESS.bus With ACCESS.bus, up to 125 users can simultaneously interact on one host computer. A close look at hardware and software architectures prepares you for the ultimate challenge: create your own game!
30 Bob Fine	Make the Most of Your DSP-based Sound Card If you have an add-on sound board for your PC, you probably simply plugged it in and forgot about it. Now it's time to dig into the innards of that board. Find out how to write your own signal processing code for it. Download: SBDSP.ZIP
40 Janice Marinelli	Circuit Cellar Design Contest Winners
44 Art Sobel	A RISC Designer's New Right ARM Development Boards Without development tools, new processors just don't stand a chance. Last month we introduced you to the features of the ARM processor. This month, we take a look at how the hardware of an ARM development board works.
56 Ed Nisley	Firmware Furnace Journey to the Protected Land: Fancy Text Output and a Boot Mystery It's scary to realize just how easy it is to introduce a system bug so obscure it only shows up under exactly the right combination of circumstances. Ed came across one while showing how to display diagnostic text and it's a beauty. Download: FF53.ZIP
66 Jeff Bachiochi	From the Bench Engineer Seeks Personal Gardener: Assisting Vocally Challenged Vegetation Even if you have a green thumb (which many of us don't), you still need a good memory to remember to water your plants. Leave it to Jeff to come up with an automated watering system that minimizes your memory requirements.
72 Tom Cantrell	Silicon Update Do You Know the Way to San Jose?: Precise Navigation Technology For fear of gettin' right turned around, Tom has gone out and found the TCM1, a precise compass which interfaces with your favorite computer using an RS-232 port.
78 John Dybowski	Embedded Techniques Between the Lines: Bar Code and Decoding Bar-code Algorithms No matter where you look, it seems bar codes are becoming more and more prevalent. John takes a look at a few of the many different encoding schemes in use and their history.
81	Advertiser's Index
85 Ken Davidson	ConnecTime -- Excerpts from the Circuit Cellar BBS
96 Steve Ciarcia	Steve's Own INK What's in a Name?

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