Circuit Cellar Ink 55
February 1995

Table of Contents


Ken Davidson

Editor's INK

Jelly Beans


Reader's INK

Letters to the Editor


Harv Weiner

New Product News


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.


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.


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.


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.


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.


Ed Nisley

PDF 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


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.


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.


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.


Advertiser's Index


Ken Davidson

ConnecTime -- Excerpts from the Circuit Cellar BBS


Steve Ciarcia

Steve's Own INK

Once Every 27,000 Years

FTP Directory for INK 55
Follow this link to order a copy of INK 55

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