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Jflít Computers- ,1.14111111116Iiii ISSUE =2 OCTOBER 1975 $1.50 the small systems journal li.111',.,1,:4410.1'. ' 7121F7. ): * Build a ;;* GRAPHICS DISPLAY 31 3 3 a '3. 'illrV/tbtriPert !!!il * TELEVISION INTERFACE * NOVAL ASSEMBLER L.NC, ,,,tit,711141/1/10141:1 IL lire* I * KLUGE HARP: Music? i ,(r(1111111)11ilillifiiiit111411,117//ill. '4^ iv 1 * LIFE Line: Game ',Iwo-- . r, J I 7.1' 1111111111111111111ifilli1i1fijaw, . TI:111: Jflít Computers- ,1.14111111116iiii"*. v The World's Greatest Toy! jr:,'1 4111 I, ,....{ps !_ t ill UJ Iii aft Ili i lin it Ei.Ti!' ... "",... CT -1024 TERMINAL SYSTEM When we designed the CT -1024 we of Frame functions. These may be want to connect it to the computer knew that there were many applica- operated by pushbutton switches, or with a parallel interface system. A di- tions for an inexpensive TV display uncommitted keyswitches on your key- rect parallel interface allows for much terminal system. Even so, we have board. Although not essential to ter- faster data transmission and reception been surprised at the many additional minal operation, these features can he and is basically a simpler device than a uses that have been suggested by our very helpful in some applications. serial interface system. Our parallel customer in the last four months since CT -M MANUAL CURSOR CONTROL interface circuit contains the necessary we introduced this kit. KIT $11.50 ppd tristate buffers to drive either a separ- ate transmitt and receive bus system, or The basic kit, consisting of the charac- a bidirectional data bus system. TTL ter generator, sync and timing circuits, If you plan to use your terminal with a logic levels are standard on this inter- cursor and 1024 byte memory gives telephone line modem, or any other face. Switch selection of either full, or you everything you need to put a six- system that requries a serial data out- half duplex operation is provided- The teen line message on the screen of any put; you will need our serial interface terminal may write directly to the TV monitor, or standard set with a (UART) plug -in circuit. This circuit screen, or the computer may "echo" video input jack added to it. Input converts the ASCII code from a par- the message and write to the screen. information to the CT -1024 may be allel to a serial form and adds "Start" any ASCII coded source having TTL and "Stop" bits to each character. The CT -L PARALLEL INTERFACE logic levels. Two pages of memory for standard transmission rate for this KIT $22.95 ppd a total of up to one thousand and circuit is 110 Baud, but optional rates We would be happy send a - twenty four characters may be stored of 150, 300, 600 and 1200 Baud may to you corn plete data describing at a time. The CT -1024 automatically be obtained by adding additional parts package the CT- switches from page one to page two to the board. The output of this cir- 1024 and a achematic. If you want this and back when you reach the bottom cuit is an RS -232 type interface and additional information, circle our num- of the screen. A manual page selector may be used to drive any type modem, ber shown below on your reader infor- switch is also provided. The main board or coupler system using this standard mation service card. The CT -1024 kit is 91/2 x 12 inches. It has space pro- interface. has complete assembly instructions vided to allow up to four accessory with parts location diagrams and step - CT -S SERIAL INTERFACE (UART) by -step wiring instructions. If you circuits to be plugged in. If you want a KIT $39.95 ppd display for advertising, a teaching aid, would like to check the instruction or a communication system then our manual before you purchase the kit, If you are using the CT -1024 as an 10 basis kit and a suitable power supply please return the coupon with $1.00 (input - output) device on own is all you will need. your and we will rush you the manual and computer system, you will probably the additional data mentioned above. CT -1 TERMINAL SYSTEM with MEMORY KIT $175.00 ppd Power supply kit to provide + 5 Volts @ MAIL THIS COUPON TODAY 2.0 Amps and - 5 Volts, -12 Volts @ 100 Ma. required by the CT -1 basic display Enclosed is $ or Master Charge # system. CT -P POWER SUPPLY KIT $15.50 ppcl or BankAmericard # Card Expiration Date A very nice convenience feature at a CT -1024 Kit CT -M Cursor Control Kit very reasonable cost is our manual cur- CT -S Serial Interface Kit CT -L Parallel Interface Kit sor control plug -in circuit. The basic NAME kit allows you to erase a frame and to ADDRESS bring the cursor to the upper left cor- CITY STATE ZIP ner (home up). By adding this plug -in, you can get Up, Down, Left, Right, $1.00 Enclosed send manual and data package Erase to End of Line and Erase to End Southwest Technical Products Corp., Box 32040, San Antonio, Texas 78284 In the Queue 847E #2 OCTOBER 1975 Foreground ADD A KLUGE HARP TO YOUR COMPUTER 14 ' r y¿ili'.":7:1_ Fun and Games - Carl Helmers LIFE Line 2 34 Software - Carl Helmers p. 14 A QUICK TEST OF KEYBOARDS 43 Hardware - Walters ADD A STACK TO YOUR 8008 52 JE Hardware - Chamberlin SITS A NOVAL ASSEMBLER FOR THE 8008 64 ENT Software - Peter Helmers IVE EA ASYNCHRONITIS 68 LIVE CELL p. 34 Hardware - Bancroft BUILD A GRAPHICS INTERFACE 70 Hardware - Hogenson Background TELEVISION INTERFACE 20 Hardware - Lancaster p. 52 MODULAR CONSTRUCTION 46 Hardware - Walters BUCK ROGERS AND THE HOME COMPUTER 58 ARTHUR INFORMATION Pi Speculation - Gardner HIGH YOALrt IN/OAMAT1ON l AT AfAlOIAOIE Nli Nucleus p. 58 Speaking of Computers 5 BYTE magazine is published monthly by Green Publishing, Letters 8 Inc., Peterborough, New Hampshire 0 3 4 5 8. Clubs and Newsletters 12 Subscription rates are $12 for one year worldwide. Two years, $22. Three years, $30. A Word From the Publisher 61 Second class postage application pending al Book Reviews 82 - - Peterborough, New Hampshire ....,.. -{_ .r 03458 and at additional Bits and Pieces 84 mailing offices. Phone: 603.924 -3873. Entire contents Reader's Service 96 copyright 1975 by Green p. 70 Publishing, Inc., Peterborough, NH 03458. Address editorial The BYTE Questionnaire 96 correspondence to Editor, BYTE, Box 378, Belmont 111A 021 78. The Sphere System... Tomorrow's Computer Today!!! IT WILL give you a competitive edge in many new micro- computer professions. IT WILL do your payroll and inventory for less than ANY competitor. IT WILL speed education in computer science using stand alone or disk basic. IT WILL monitor and protect your home or business when you can't. IT WILL maintain your mailing list, balance your checkbook, or edit your resu mé. IT WILL present new challenges long after your kit assembly project has ended. IT WILL allow you to expand to the largest set of peripherals and software available in today's low cost computer market. AND... IT WON'T BREAK YOUR BANK !!! MORE Are you? send info to a an educator STAMP a hobbyist HERE n an OEM ... QTY /YR looking for product to ZIP sell. What is your application SPHERE CORP. 791 South 500 West Bountiful, Utah 84010 cut here cut here Clip out and mail coupon or call (801) 292 -8466 Before After KITS Sept. 30 Sept. 30 SYS 1 4K Byte computer with TV terminal, $ 650 $ 860 keyboard, and ROM monitor SYS 2 4K Byte computer with TV terminal, 750 999 keyboard, ROM monitor, and audio cassette interface. SYS 3 20K Byte computer with TV terminal, 1345 1765 keyboard, ROM monitor, audio cassette interface, and extended basic programming language. NEW FEATURES PEN Light pen kit for CRT board 80 100 BAS 1K micro -basic prom set (a modified basic language that makes your computer talk basic without loading from cassette) 90 140 RAC 2 Attractive plastic chassis with CRT display and acoustic coupler. 270 300 791 South 500 [West. Bountiful, Utah 84010 (801) 292 -8466 4 Carl Helmers Functional Specifications Editorial ' The Home Brew Voder" the "ship's computer" give the 5 unused bits of the status reports aurally to make typical speech value word the game more exciting - could be used to control 5 perhaps coupling in a few additional bells and whistles. A whole line of home bells and whistles (literally) in The software of the computer experimentation the form of special purpose application is in two can be started by the person synthesizers of photon segments. There is the who designs - and writes up torpedo, phaser, transporter machine -independent data as an article for BYTE - a speech elements, say 100 and other sound effects table which specifies the basic simple and practical circuit to basic sounds, the data Trekkies know and love. phoneme information - and generate speech output from requirement is thus 3900 Then there is the ultimate the rules for combination phoneme codes in a program. bytes - well within the application - making a higher into understandable words. The output problem in digital memory budgets of many grade voice synthesizer which Then there is the machine - speech representation BYTE readers' systems. The can sing, literally, so your dependent programmed techniques is well within the thruput required to output machine can play vocal "talker" routine which range of a microcomputer the voice bytes is also well music. accepts an "n- byte" character system and inexpensive within a micro's capacity - How can such audio string with phoneme codes digital to analog conversion 1000 microseconds is a lot of peripherals be brought into and synthesizes the phonemes methods (such as the time to fool around with.
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