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ZX Computing Vo4. One Number One Summer 1982 Editor: Tim Hartnell Editorial Assistant: Tina Boylan Group Advertising Manager: Ron Moore Managing Editor: Ron Harris. Managing Director: T J Conned. Origination and design by MM Design ft Print. London Published by Argus Specialist Publications Ltd, 145 Charing Cross Road. London WC2H OEE. CONTENTS Orbit Sinclair users speak out on the RAM pack, a new users' club opens in Scotland, and more. Benchmarks 11 Henry Budgett and Tim Hartnell show you how to test the speed of your ZX computer, with eight programs to try. windfall Here's a 16K ZX81 game designed to appeal to your materialistic instincts. Chess Chess in 1K? Well, this program doesn't play chess, but sets up a board so two people can play. Splendid graphics, and in just 1K. ZX Computing it constantly on the look-out for wall written articles and programs If you think that your efforts meet our standards pleasa feel free to submit your work to us for consideration. Material should be typed If possible. Any programs submitted must be listed, cassette tapes alone will not be accepted, and should be accompanied by documentation to explain how they work and make it easy 10 run them AN submissions will be acknowledged Any published work wilt be paid for. Al work for consideration should be sent to the Editor at our Charing Cross Road address A massive 16K ZX81 program to recreate the orbits of the four inner planets of our solar system. BureaudeChange ... .23 If you're in the habit of jetting off to exotic parts of the world like Blackpool, you'll need your trusty ZX81 to decode the funny money for you. ROM Bug 24 Dr Frank O'Hara grapples with the dreaded ROM bug. ZX80 Renumber 27 A renumber program to help you tidy up your output. Library Building 28 There's a great temptation to put all your programs on one long, long cassette. We tell you why it's not such a great idea, and give you some hints to organise your muddled life. power Boat 35 Seasickness be my friend. Ruislip Lido awaits your ZX-powered craft. zap Get your computer into gear for this little stunner. Tourist Trap 38 Here's your chance to get back at all those people who keep stopping you and asking you the way to Piccadilly. This massive ADVENTURE program will run on a ZX80 orZX81. Bigger Bytes The IK supplied with the standard ZX81 is a little restrictive, to say the least. Stephen Adams outlines a simple, and cheap way to increase your memory power. Machine Code 46 Machine code is a piece of cake. Or so our authors believe, and they do their best to unravel its mysteries and convince you. Micromouse 49 This will save you actually building a robot mouse, or a maze for it to run in. All you need is a 16K ZX81. PEEKing and POKEing .50 PEEK and POKE are very usefut programming tools. Here's how you can put them to work for you. One-armed Bandit 56 Set this program up on your 1 K ZX80, and win a little money from your friends. ZX COMPUTING SUMMER 1)x COMPUT
ZX Computing is published quarterly in April, July. October end January. Distributed by: Argus Press Sales b Distribution Ltd. 12 18 Peul Street. London EC2A 4JS 01-247 8233. Printed by: Henry Garnett Ltd., Rotherham. The contents of this publication including all articles, designs, plans, drawings and programs and all copyright and other intellectual property rights therein belong to Argus Specialist Publications Limited. AH rights conferred by the Law of Copyright and other intellectual property rights and by virtue of international copyright conventions are specifically reserved to Argus Specialist Publications Limited and any reproduction requries the prior wntten consent of the Company. 1982 Argus Specialist Publications Limited Othello This game was invented way back in the 1880s, and has recently surged in popularity. Who needs people, when a 16K ZX81 can prove a hard-to-beat companion? Swappo 61 Get your brain and your digits in order in this 16KZX81 program. Book Reviews 62 The titles on the market for ZX computer owners is growing by the hour. We try to sort out some of the more worthwhile ones for your bookshelf. Area Calculator 65 Carpets or paint, the ZX80 can work out how much area you'll be covering. Newsbeat 66 Here's the latest news from Sinclair Headquarters, including the true story behind Clive's sweaty tracksuit. Hardware Review 68 Stephen Adams takes a close look at MCP's Microdevelopment pack, and gives you an honest assessment of its worth. Hypno A bewildering array of designs await you in this full screen dazzler for a 1 6K ZX81. Keyboard Review ... .73 Crofton have produced a keyboard which completely swallows the ZX81 Tim Hartnell tries it out. ZX COMPUTING SUMMER 1)x COMPUT Quicksilva 74 Nick Lambert used to make electronic organs, now he runs a company which has put proper graphics, sound and colour on the ZX81. We talk to the man, and we examine his output. Chopper Squad 77 Climb aboard your 1KZX81 'copter and head for the hills. 'Tis time to drop a few bombs. Draughts 'Guess the number' is OK for a while, but eventually ZX80 owners want a program with a bit more meat. This version of draughts gives you a full screen display and rapid response. Business 86 Make full use of your ZX81 with this program to handle files on up to 100 customers. We also take a close look at one of the leading suppliers of ZX business software, Mike Salem. UFO Space shootdown time again for ZX81 owners. ZX Drawing Board .... 9 Three programs to turn your ZX80 or ZX81 into a 'real artist'. Closer Look 92 What makes the ZX81 tick? Peter Freebrey takes a took inside. Horrorville 96 3 1 6K ADVENTURE time withr this frightening program for brave ZX81 owners. ZX80 Fights Back 101 A bundle of programs for old ROMmers. Software Review ...104 Down in the depths with Greye's T Rex. or on the playing field with Michael Orwin, our reviewers lead the way. Printer Tricks .107 Make your ZX printer bend to your will, with wide characters and large characters. Moving Pictures 108 Get your aliens on the move with these programming techniques. Software Review ... 112 Hewson's "Hints and Tips", along with their software moves under the microscope. Machine Code 114 More of machine code's mysteries dispelled. Biorhythms 116 Good day. bad day, sad day, glad day . . . this program tells it all. Computer Glossary . .118 Bewildered by the jargon committed computer owners use? Run through this extensive article, and you'll be able to fake it with the best of them. Squareology 124 Challenge your 16K ZX81 to a game which takes real brains to beat. Specifications 128 Our indispensible reference guide, for serious users.
Page 1 and 2: j Summer Britain's Biggest Magazine
Page 3: ZX 80/81 HARDWARE/SOFTWARE ZX KEYBO
Page 7 and 8: 16K-byte RAM pock for massive add-o
Page 9 and 10: The @*?$1!&£@ RAM pack Dear ZX Com
Page 11 and 12: I u < o •0 8 & £T © Benchmarks
Page 14 and 15: 1 1© L" 20 30 IN5 5 0 60 80 9C 100
Page 16 and 17: The Explorer's Guide to the ZX81 IF
Page 18 and 19: Orbit S M King from Bristol takes y
Page 20 and 21: ID 15 20 25 30 35 4G> LBV 5 NMER RE
Page 22 and 23: E" OR Pi="M" THEN GOTO 785 CO)TO 7"
Page 25 and 26: I first became aware of the bug in
Page 27 and 28: A. Beasley After using the ZX80 for
Page 29 and 30: I sr The first few weeks after the
Page 31 and 32: i! I are odd jmeone to write a a ta
Page 33 and 34: id (and IC AND )MPUTER" er and >ut
Page 35 and 36: 16K Games Power Boat if you're desp
Page 37 and 38: }RTIO 3RT W J Hfl'.f K E COl T CORj
Page 39 and 40: 1220 \225 230 250 ,L NEED m 270 WAY
Page 41 and 42: IKING >S TO THi 350 >TCARD Ol OF 84
Page 43 and 44: LAD ROM THE AT MRS TO FROM V" ) $5)
Page 45 and 46: int it on the a piece of iuble-side
Page 47 and 48: ie •chin* da add re si | )HL. .FI
Page 49 and 50: Micro This program it fascinating t
Page 51 and 52: 9 S e E k isplay-file we can POKEin
Page 53 and 54: sves ile sre insect is ion*t n lsec
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— 32) limiting the firing to ten
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Winning Positions COIN COIN BELL BE
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REM "OTHELLO" St_GU GOTO 1103 LET 5
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lTURES P&P) ITAL iGUE write to IGHT
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ms, arid I time you convince somebo
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ist for the feel good luct their 5
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*t»m Tarshis, Executive Vice Presi
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and 2.5 volts. This will produce a
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tng of KE, the the his mg ay. cts i
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Review Keyboard Review Crofton's Ad
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"The hi-res board seems to go to a
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Make the most of IK Chopper Squad R
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onic Systems 80/1 ^ / RAMPACK MASSI
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51 IF A(2) «* 188 THEN LET A (Z)
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4110 IF (A(Z - 13) = 1 OR A(2 - 13)
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ZX81 HARDWARE 40 KEY KEYBOARD. Kit
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4090 GOTO 9100 5000 GOSUB 9500 5010
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I 1K Games 10 LET 20 LET 30 LET 4-0
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Etchasketch This very short program
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meant the addition to its repertoir
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SYSTEM/MULTIFUNCTION COMMANDS BREAK
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270 280 290 300 310 320 IF IF IF IF
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Make sure you get every issue of ZX
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ZX80 Programs ZX80 fights back Musi
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Catch Avoid being trapped by your s
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Software Orwin strikes again Casset
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ZX81 Software LARGE CHARACTERS REM
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Moving graphics Getting into the Mo
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Specialist Book§ i Choosing progra
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OZJIJL I* » JTA. _ A."--." * rt k
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the new address (in decimal) follow
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WHAT CAN I DO WITH 1K? If your answ
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Compiler A program whose function i
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ZX COMPUTING SUMMER 1982 Computer G
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S-100 Name of a bus or connection s
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After taking your move the computer
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WHAT'S ON NEXT? IN HOBBY ELECTRONIC
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are not lost when the ZX81 is turne
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ZX Users' Club JOIN YOUR USERS' GRO
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