Circuit Cellar Ink 29
October/November 1992

Table of Contents

2 Ken Davidson	Editor's INK A Look at Next Year
6 Harv Weiner	New Product News
12 Brian Farmer	Planting Geraniums by Robot Build an MC68HC11-based 2-D Sensor What do you do when you need a sensor for an application nobody has thought of? Build your own. This unique sensor helps a robot prevent damage to delicate plant cuttings when handling them. Download: ROBOT.ZIP
22 Brian Kenner John Wettroth	The Design of a Time Domain Reflectometer As anyone who's tried to track down an elusive network cabling problem knows, improper termination and bad cables are common culprits. Let this time domain reflectometer make your life a little bit easier. Download: TDRSRC.ZIP
34 Jim Schimpf	Serial I/O on the IBM PC As anyone who's tried to write serial support code for an IBM PC knows, the BIOS routines just don't cut it when trying to keep up with multiple high-speed ports. Jim's package replaces the BIOS with capable routines. Download: SERCOM.ZIP
40 Bill Houghton	Add Text Overlay to Any Video Display All the latest VCRs have on-screen programming in an effort to simplify the notorious task. Now you can have your HCS II or any other computer send you messages while you're watching your favorite TV show. Download: TVLINK.ZIP
50 James R. Furlong	The Virtues of the Hue, Lightness, Saturation Color Model If you thought RGB (red, green, blue) was the only (or best) way to represent color, think again. The Hue, Lightness, Saturation (HLS) model can actually be better than RGB at representing colors in some applications. Download: MYPALZ.ZIP
61 Michael Swartzendruber	Driving Multiple VGA Monitors Monitor extenders costing hundreds of dollars are available that allow you to drive multiple monitors with a single display adapter. Michael uses just a touch of ingenuity to bring down the price considerably.
64 Ed Nisley	Firmware Furnace Extending Your Control: The HCS II MCIR-Link Since the introduction of the HCS II home control system, one of the most requested new features has been the ability to send IR codes to consumer electronic equipment. The new MCIR-Link makes those requests reality. Download: MCIRLINK.ZIP
74 Jeff Bachiochi	From the Bench X-10 Interfacing with PLIX The TW523 might be considered by some to be the perfect X-10 computer interface. The complicated timing can be daunting to many, though. Throw a PLIX chip at the circuit and your troubles may be solved.
80 Tom Cantrell	Silicon Update I'm 18.432 -- and I Like It Some people just can't get enough horsepower out of their processors, and Tome is certainly one of them. Zilog's newest speed demon runs the faithful Z180 (HD64180) up to 18.432 MHz and beyond.
88 John Dybowski	Practical Algorithms The Middle Ground -- Negotiating a Keyboard Interface Much of the computer engineer's life is spent making tradeoffs between doing things in hardware and doing them in software. John looks at several options available when designing a keyboard interface.
95 Ken Davidson	ConnecTime -- Excerpts from the Circuit Cellar BBS
97	Advertiser's Index
112 Steve Ciarcia	Steve's Own INK Let Me Tell You About Yourself

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