Circuit Cellar Ink 55
February 1995

Table of Contents

2 Ken Davidson	Editor's INK Jelly Beans
6	Reader's INK Letters to the Editor
8 Harv Weiner	New Product News
14 Bill Payne	Interfacing Flow Meters to High-speed Counters After introducing us to the basics of flow meters, Bill delves more deeply into how to get around a noisy analog situation. His special trick -- debouncing the magnetic reed switch in a high-speed application.
18 Jeff Fisher	Use Infrared to Make Embedded Printing Easy Just how cheap and easy can it be to add a printer to an embedded system? With some nifty innovation, Jeff modifies a HP calculator printer to communicate with his computer using an infrared signal.
22 Lalo J. Gastriani	It's Not Just for Memory Anymore An Introduction to PCMCIA You know the credit-card revolution has made a significant impact when you look at laptop peripherals today. Lalo's article introduces us to this evolving breed of devices.
30 Tracey Lee Kok-Leong Ong	Speeding and Slimming Your Port Access A Different Way of Reading from the PC Parallel Port While many PC manufacturers today are supplying their machines with true bidirectional parallel ports, reading data in with older machines is still tricky. Here's one method that requires no changes to the PC.
36 David Prutchi	Battery-operated Power Supplies Selecting the Right Battery and Supply for Your Application Matching batteries to design specifications is critical. To help developers with this task, David offers an overview of batteries -- primary, secondary, backup, and their use in driving power supplies.
50 Ed Nisley	Firmware Furnace Journey to the Protected Land: Infrastructure Improvement It's time to put some punch into those tiny taskettes Ed introduced last month. Taking advantage of protected mode, he adds a task dispatcher to handle traffic control while each task goes about its own business. Download: FF55.ZIP
60 Jeff Bachiochi	From the Bench Fitting 10 oz. into a 5-oz. Package One fax plus one modem plus one microcontroller makes one telecontroller. It's small, it's tight, and it's rugged. Jeff explains how Xecom's XE5224 is durable and independent enough to combat highway calamities.
68 Tom Cantrell	Silicon Update I Sync, Therefore I DRAM Tom reminds us that in the beginning, DRAM was created. And, after many days, Hitachi brought forth synchronous DRAM, which offers better timing, greater speed, and more bandwidth. Tom says that this is good.
76 John Dybowski	Embedded Techniques Downsizing: Atmel's AT89C2051 Flash-based Microcontroller This little chip is essentially a flash-based 8051 with some extra RAM in a 20-pin package. True, it does possess fewer I/O pins, but it provides all the peripherals and functions of a standard 8051.
81	Advertiser's Index
82 Ken Davidson	ConnecTime -- Excerpts from the Circuit Cellar BBS
96 Steve Ciarcia	Steve's Own INK Once Every 27,000 Years

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