JULY 1977 ECU in the Queue Volume 2 Number 7
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/Quit ¡pi: www.americanradiohistory.com The 9 -inch screen of the CT-VM monitor ($175) shown here with Southwest's new CT-64 illustrates the terminal's 64- character lines, switchable control character printing, and word highlighting. At just $500 for both, these matching units provide a complete CRT terminal with full cursor control, 110 -1200 Baud serial interface, and many other features. Now $325 buys a 64- character terminal kit Our new CT-64 terminal kit gives you scrolling, full The CT-64's features include: cursor control, 128 -character ASCII display (with both 64 or 32 characters per line (16 lines) upper and lower case), and two 1K memory pages. It's Premium display with both upper and lower case usable with any 8 -bit computer. letters, and descenders (g, j, etc.) Two 1K Add our optional fully assembled 12 MHz CT-VM pages of 8 -bit memory monitor for another $175 and you'll have the best CRT Scrolling or page mode operation terminal buy offered anywhere. 32 control character decoding Prints control characters (selectable) The CT-64 gives you full cursor control, home -up and 128 -character ASCII set erase, erase to end of line or end of frame, cursor on /off, 110 /220 Volt 50 -60 Hz power supply screen reversal, scroll or page, solid or blinking cursor, Highlights words with reversed background page selection, and end -of -page warning beeper. Optional 9 -inch monitor with matching cover available Complete with keyboard, power supply, 110 -1200 Baud serial interface, and case Okay, Southwest, I know a bargain when I see it or BAC # Exp. Date Enclosed is $500 for the whole works or MC Exp. Date (CT -64 terminal plus 12 MHz CT-VM monitor) # Here's $325 for the CT-64. Name Address Send only data for now. Southwest Technical Products Corp. Send me your $395 MP -68 computer kit. City State ZIP 219 W. Rhapsody, San Antonio, Texas 78216 Circle 1 on inquiry card. www.americanradiohistory.com Meet the most powerful µC system available for dedicated work. Yet it's only $595: Here's the muscle you've been telling us you wanted: widely regarded as the standard of the future. So you're a powerful Cromemco microcomputer in a style and price in the technical fore with the Z -2. range ideal for your dedicated computer jobs -ideal for BROAD SOFTWARE /PERIPHERALS SUPPORT industrial, business, instrumentation and similar applica- Since the Z -2 uses the Z -80, your present 8080 soft- tions. ware can be used with the Z -2. Also, Cromemco offers It's the new Cromemco Z -2 Computer System. Here's broad software support including a monitor, assembler, some of what you get in the Z -2 for only $595: and a BASIC interpreter. The industry's fastest /P board ( Cromemco's highly The Z -2 uses the S -100 bus which is supported by the regarded 4 MHz, 250 -nanosecond cycle time board). peripherals of dozens of manufacturers. Naturally, all The power and convenience of the well -known Z -80 Cromemco peripherals such as our 7- channel A/D and /P. D/A converter, our well -known BYTESAVER with its A power supply you won't believe ( +8V @ 30A, built -in PROM programmer, our color graphics interface, +18V and -18V @ 15A - ample power for addi- etc., will also plug into the S -100 bus. tional peripherals such as floppy disk drives). LOW, LOW PRICE A full -length shielded motherboard with 21 card slots. You'll be impressed with the Z -2's low price, technical Power -on -jump circuitry to begin automatic program excellence and quality. So see it right away at your execution when power is turned on. computer store-or order directly from the factory. S -100 bus. Standard rack -mount style construction. Z -2 COMPUTER SYSTEM KIT (MODEL Z -2K) (includes All -metal chassis and dust case. 4 MHz /P card, full -length 21- card -slot motherboard, 110- or 220 -volt operation. power supply, one card socket and card -guide set, and front panel; for rack mounting) $595. DEDICATED APPLICATIONS The new Z -2 is specifically designed as a powerful but Z -2 COMPUTER SYSTEM ASSEMBLED (MODEL Z -2W) economical dedicated computer for systems work. Notice (includes the above as well as all 21 sockets and card that the front panel is entirely free of controls or switches guides and a cooling fan; for rack mounting ) $995. of any kind. That makes the Z -2 vir- tually tamper -proof. No accidental program changes or surprise mem- ory erasures. FASTEST, MOST POWERFUL /C Cromemco's microcom- puters are the fastest and most powerful available. They use the Z -80 mi- croprocessor which is Shown with optional bench cabinet 'kit price Specialists in computers and peripherals 2412 CHARLESTON PO.. MOUNTAIN VIEW, CA 94043 (416) 964 -7400 www.americanradiohistory.com TV DAZZLER To make your computer more useful- 01 a wide choice of i memory, I/O, CPU Your computer's usefulness de- grammer. Uses high -speed 2708 eras- (Model TRT -K): $195. Assembled pends on the capability of its CPU, able PROMs. A must for all com- (Model TRT -W): $295. memories, and I/O interfaces, right? puters. Will load 8K BASIC into RAM JOYSTICK. A console that lets So here's a broad line of truly in less than a second. Kit (Model you input physical position data with useful computer products that lets BSK -0): $145. Assembled (Model above Model D + 7 A/D card. For you do interesting things with your BSW -0): $245. games, process control, etc. Con- Cromemco Z -1 and Z -2 computers. 16K CAPACITY PROM CARD. Ca- tains speaker for sound effects. Kit And with your S -100- compatible Al- pacity for up to 16K of high -speed (Model JS -1 -K): $65. Assembled tairs and IMSAIs, too. 2708 erasable PROM. Kit (Model (Model JS -1 -W): $95. 16KPR -K): $145. Assembled (Model CPU 16KPR -W): $245. PROFESSIONAL QUALITY Z -80 MICROPROCESSOR CARD. You get first -class quality with The most advanced p.P card avail- I/O INTERFACES Cromemco. able. Forms the heart of our Z-1 FAST 7- CHANNEL DIGITAL - Here are actual quotes from ar- a and Z -2 systems. Also direct re- ANALOG I /O. Extremely useful ticles by independent experts: "The placement for Altair /IMSAI CPUs. board with 7 A/D channels and 7 Cromemco boards are absolutely 4 Has -MHz clock rate and the power D/A channels. Also one 8 -bit par- beautiful" . "The BYTESAVER is of the Z -80 µP chip. Kit (Model ZPU- allel I/O channel. Kit (Model D + tremendous" . "Construction of K): $295. Assembled (Model ZPU- 7A -K): $145. Assembled (Model D Cromemco I/O and joystick are out- W): $395. + 7A -W): $245. standing" . "Cromemco periph- MEMORIES TV DAZZLER. Color graphics in- erals ran with no trouble whatso- 16K RAM. The fastest available. terface. Lets you use color TV as full - ever." Also has bank -select feature. Kit color graphics terminal. Kit (Model Everyone agrees. Cromemco is (Model 16KZ -K): $495. Assembled CGI -K): $215. Assembled (Model tops. (Model 16KZ -W): $795. CGI -W): $350. STORES /MAIL 4K RAM. Bank -select allows ex- DIGITAL INTERFACE (OUR NEW So count on Cromemco. Look pansion to 8 banks of 64K bytes TU -ART). Interfaces with teletype, into these Cromemco products at each. Kit (Model 4KZ -K): $195. As- CRT terminals, line printers, etc. Has your store. Or order by mail from sembled (Model 4KZ -W): $295. not one but two serial I/O ports and the factory. THE BYTESAVER - an 8K capa- two 8 -bit parallel I/O ports as well We wish you pleasure and suc- city PROM card with integral pro- as 10 on -board interval timers. Kit cess with your computer. Cromemco i n c o r p o r a t e d Specialists in computers and peripherals 2432 CHARLESTON RD., MOUNTAIN VIEW, CA 94043 (415) 964 -7400 Circle 2 on inquiry card. www.americanradiohistory.com JULY 1977 ECU In the Queue Volume 2 Number 7 PUBLISHERS Foreground Virginia Peschke Manfred Peschke 12 HOW TO COMPUTERIZE YOUR MODEL RAILROAD EDITOR IN CHIEF Applications -Brown Carl T Helmers Jr 36 THIS CIRCUIT MULTIPLIES PRODUCTION MANAGER Arithmetic Hardware -Hall Judith Havey CIRCULATION MANAGER 52 THE TV OSCILLOSCOPE Gregory Spitzfaden Hardware- Barbier ASSISTANT PUBLISHER 64 SPEECH RECOGNITION FOR A PERSONAL COMPUTER SYSTEM Debra Boudrieau Peripherals- Boddie EDITOR Christopher P Morgan 92 A MACHINE CODE RELOCATOR FOR THE 8080 CO -OP EDITOR Software -Zolman Raymond Cote 118 HOW FAR -WHICH WAY? PRODUCTION EDITORS Applications -Pittet Karen Gregory Nancy Salmon 122 ADD CURSOR CONTROL TO YOUR TVT I I EDITORIAL ASSISTANT Hardware -McGahee Ingrid Nyland 126 GIVING KIM SOME FANCY JEWELS PRODUCTION ASSISTANT Hardware -Grater Cheryl Hurd ADVERTISING ASSISTANT Background Noreen Bardsley SUBSCRIPTIONS Kimberly Barbour 42 CONDENSED REFERENCE CHART FOR THE 6800 DEALER SALES Reference Materials -Borrmann Ginnie F Boudrieau 44 A TRAIN CONTROL DISPLAY USING THE LSI.11 MICROCOMPUTER ADVERTISING Applications- Hart -Badger Elizabeth Alpaugh 72 HOW TO PICK UP A DROPPED BIT Debra Boudrieau Virginia Peschke Error Theory- Maurer CLUBS, PAPERBYTES 78 GIVE YOUR MICRO A MEGABYTE Peter Travisano System Design -Grappel TRAFFIC MANAGER 82 AN INTRODUCTION TO NUMBERS Edmond C Kelly Jr Software- Simmons ART Mary Jane Frohlich 96 BASICally BASIC Wai Chiu Li Software -Baker Ellen Shamonski- Bingham SPECIAL PRODUCTS Nucleus Medellin Stephens Floyd Rehling EXECUTIVE SECRETARY 4 In This BYTE 124 Classified Ads Patricia Clark 6 This Elephant Never Forgets 128 PAPERBYTES Forum RECEPTIONIST 10 Letters 142, 166 Programming Quickies Jacqueline Earnshaw 25 West Coast Computer Faire 151 Book Reviews DRAFTING Lynn 32, 115, 129 What's New? 155, 158 BYTE's Bits Malo Bill Morello 34, 150 Technical Forum 156 PAPERBYTES: Floppy Disk Stephen Kruse 41 Ask BYTE Object Code TYPOGRAPHY 57 BYTE's Bugs 160 Clubs, Newsletters Custom Marketing Resources Inc 90 Desk Top Wonders: Jeu de 176 BOMB Goodway Graphics PHOTOGRAPHY N I M, Peut Étre? 176 Reader Service Ed Crabtree EDITORIAL CONSULTANT Cover: COMPUTER ENGINEERING by Robert Tinney Daniel Fylstra ASSOCIATES BYTE is published monthly by BYTE Publications Inc, 70 Main St, Peterborough NH 03458.