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Excerpts from the Circuit Cellar BBS CONNEC WWW.GiURUMELE.Hi2.RO Words are wonderful in their ability to form vi- module puts an 80286,512K memory, and all of the “glue” sions and emotions in our minds. Such a simple word as chips for a working AT-type computer into a package only “home” can, with itsassociations, bring a tear to a weary slightly larger than an 80486. The engineers at Mi tsumi see traveler’s eye. Other words, take COMDEXasanexample, the 80286 playing an increasing role in embedded applica- can produce fevered visions of technology oozing from the tions, and they are pushing the idea of the entire computer very pores of casinos while armies of disembodied feet as a plug-in module. According to the engineers, fax plod through aisles stretching to infinity.. machines have already been designed around their 80286, Can you tell that I just finished “doing” COMDEX? A and more products are on the way. I think they may be on week of strolling past the latest in microcomputers has left to something with this approach, and we’re working on an me tired and footsore, but encouraged about the future of article showing how to use the module in applications. the small computer industry. A side-effect of the 80286’s move into embedded applications may be the demise of the 80186. The ‘186 has MS-DOS MARCHES ON... been a favorite of designers who wanted to develop soft- ware under MS-DOS but needed more oomph than an . ..or more accurately, the Intel 80x86 family keeps 8088 could muster. Products like the Mitsumi module rolling. The perception of the 80x86 as an architecture for make it much harder to justify the 80186 approach. desktop business machines only is in the process of radical Finally, the time has arrived for XT-class machines to change. While there were scads of computers for running take a serious role in the control application market. I spreadsheets and word processors, I sawconsiderable evi- know: “Real”computer people hate thearchitecture, loath dence of the 80x86 becoming a leader in the application the operating system, and can’t abide the lack of built-in and control markets. In one form or another, the Intel I/O. Noneof thatmatters when you can buy a full IO-MHz architecture was the dominant force at almost every level. XT motherboard for $48 (quantity 1). At that price, eco- First, the high end: You couldn’t swing a dead cat nomics begin to cast a rosy glow over most shortcomings. without hitting an 80486 motherboard at COMDEX. Of Several months ago I wrote about the move toward course,findingan80486microprocessorwasanothermatter using PC-type computers for control applications. The entirely, and all the 80486s to be found had major bugs of trends I saw at COMDEX tell me that the trend is acceler- one flavor or another. No matter, the manufacturers have ating. Good software development tools and low hard- decided that 80486 is the way to go, so the clones were out ware costs are teaming up to make the Intel/MS-DOS in force. Most of the “clone” motherboards used the ISA combination irresistible to a lot of developers. (PC/AT) bus, and many proclaimed EISA compatibility. What does all of this mean for other microprocessors Since the EISA spec is still a darker secret than the avionics and controllers? Other architectures won’t wither just be- in the B-2, I don’t know whether or not any of the EISA cause of new competition. We’ll see a push to bring machines work as promised. In any event, the 80486 software development tools to a new level of functionality machines are being sold as the microcomputers that will and friendliness. Engineers and programmers have toler- finally bring about the demise of minicomputers. Sales ated obtuse commands and low functionality in microcon- folks talk about the 80486 as the perfect processor for LAN troller development tools because “that’s the way it’s servers, but the winks and nudges on the side say that no always been done.” Users accustomed to the “look and high-powered engineer, programmer, or financial analyst feel” of the best MS-DOS compilers and other develop- is going to be satisfied until a fire-breathing 80486 com- ment tools, will push the software vendors to give them puter with 600-MB hard disk, 16 MB RAM, 8514A graph- better tools. If the vendors are smart, they won’t argue. ics, and $20,000+ price tag is enshrined on his or her desk. The favorite pastime of computer industry pundits is proclaiming the death of the 80286. Since everyone knows how deficient the processor is, you wouldn’t have ex- pected to see any major moves in the 80286 market. In my view, though, one of the most exciting products of the show was the 80286 plug-in module from Mitsumi. The February/March 1990 1 WWW.GiURUMELE.Hi2.RO FOUNDER/ EDITORIAL DIRECTOR Steve Ciarcia PUBLISHER CIRCUIT CELLAR~~/@~@ Daniel Rodrigues THE COMPUTER EDITOR-in-CHIEF Curtis Franklin, Jr APPLICATIONS PUBLISHING CONSULTANT JOURNAL John Hayes ENGINEERING STAFF Ken Davidson Jeff Bachiochi Edward Nisle y Building etude: 21 Part 1 - A 25-MHz Analog-to-Digital Convertor for the PC Bus CONTRIBUTING 0 EDITORS by J. Conrad Hubert and Dick Hubert Thomas Cantrell It’s hard to imagine doing serious data Jack Ganssle acquisition without a serious digitizer. CONSULTING The etude 25MHzdigitizer board is just EDITORS that. The first of two parts deals with Mark Dahmke the hardware side of the story. Larry Loeb CIRCULATION COORDINATOR Rose Manse/la CIRCULATION The BCCH 16 CONSULTANT 42 Part 2 - Porting a Multitasking BASIC to the H 76 Gregory Spiizfaden cl by Jack Ganssle ART & PRODUCTION The BCCH 16 is more than hardware: a multitasking BASIC compiler lets you DIRECTOR put its power to use. Jack Ganssle looks at the process of porting a compiler Tricia Dziedzinski between similar processors in the wrap-up article on the BCCH 16. PRODUCTION ARTIST/ILLUSTRATOR Lisa Ferry BUSINESS MANAGER Jeannette Walters Editor’s INK Dateline: Las Vegas 1 NW PRODUCTS by Curtis Franklin, Jr, EDITOR Harv Weiner Reader’s INK-Leffers to the Editor 5 STAFF RESEARCHERS Northeast NEW Product News 8 Eric Albert William Curie w Richard Sawyer Visible INK- Letters to the INK Research Staff 12 Robert Stek Midwest Jon E/son Firmware Furnace Tim McDonough An Exercise for the Student 52 West Coast Building Software from fhe Ground Up Frank Kuechmann by Ed Nisley Mark Voorhees From the Bench ENTION . ATTENTION . ATTENTION ..a ATT 60 Cover Illustration Building an LED Moving Message Display by Robert Tinney by Jeff Bachiochi 2 CIRCUIT CELLAR INK WWW.GiURUMELE.Hi2.RO Circuit Cellar BBS-24 Hrs. 300/1200/2400 bps, 8 bits, no parity, 1 stop bit, (203) 871-1988. The schematics pro- vided in Circuit Cellar INK are drawn using Schema from Omation Inc. All pro- Digital Signal Processing grams and schematics in 30 Circuit Cellar INK have r-l Part 1 - An Introduction been carefully reviewed by Dean McConnell to ensure that their per- formance is in accor- dance with the specifica- Digital Signal Processors (DSPs) tions described, and pro- have changed the way we look grams are posted on the at analog signal problems. In the Circuit Cellar BBS for elec- tronic transfer by subscrib- first of two parts, Dean McConnell ers. discusses the most commonly Circuit Cellar INK used transforms and how they’re makes no warranties and assumes no responsibility applied. or IiabilitY of any kind for errors in these programs or schematics or for the con- sequences of any such errors. Furthermore, be- Building An IBM PC Keyboard Translator cause of the possible vari- r-l14 ation in the quality and An 803 7-bused System for Code Translation condition of materialsand by Bill Curlew ’ workmanship of reader- assembled projects, Cir- You know the problem: You have a favorite cuit Cellar INK disclaims any responsiblity for the keyboard, but it only works with one of your safe and proper function systems. Wouldn’t it be nice if you could of reader-assembled proj- take “old reliable” with you as you move ects based upon or from plans. descriptions, or in- from system to system? With the keyboard formation published in translator developed by Bill Curlew, you can! Circuit Cellar INK. CIRCUIT CELLAR INK (ISSN 08968985) is pub- lished bimonthly by Circuit CellarIncorporated.4Park Street.Suite20.Vernon.CT 06066 (203) 875-275 1. Second-class postage paid at Vernon, CT and additional offices. One- year (6 issues) subscription rate U.S.A. and possessions S14.95, Canada S 17.95, all Advertiser’s Index 65 other countries $26.95. All subscription orders pay- able in U.S. funds only, via Silicon Update international postal Earthshaking Chips 68 money order or check A Report from the Second Microprocessor Forum drawn on U.S. bank. Di- by Tom Cantrell rect subscription orders to Circuit Cellar INK, Subscrip- Software by Design tions, P.O. Box 2099, Ma- hopac. NY 10541 or call Memory Management on the HD64180 72 (203) 875-2 199. by Jack Gansle .POSTMASTER: Please send address changes to Circuit Cellar INK. Circula- ConnecTime--Excerpts from fhe Circuit Cellar BBS 76 tion Dept.. P.O. Box 2099. Conducted by Ken Davidson Mahopac, NY 10541. Entire contents copy- right 1990 by Circuit Cellar Steve’s Own INK Incorporated. All rights re- served. Reproduction of An Analog State of Mind 80 this publication in whole by Steve Ciarcia or in part without written consent from Circuit Cel- lar Inc. is prohibited. February/March 1990 3 WWW.GiURUMELE.Hi2.RO READER’S INK letters to the Editor TAKE CONTROL With a few PLDs around, and the appropriate devel- opment software and hardware, home designers are no I really enjoy reading Cr~curr CELLAR INK.
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