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The Explorer's Guide to the ZX81 IF YOU'VE GOT A 2X81 THEN YOU NEED THIS BOOK 1 Prograrm for IK HAM. and prograrm for 16K HAM Gjmei Bui mm and Engineering Application! RAM & I/O Circuit!. Uuful ROM Routine! Hmti and Tipi 120 pagei f4 95 What Can I Do with 1K? By Roger Valentine A Irath and original book containing 40 program* and routinei tor the unexpended 2X81 34 Amazing Games for the 1K ZX81I by AJ at tan GourUy. £3 95| The ZX80 Magic Book •With 8K ROM/ZX81 Supplement* Gimn pfogramt, computer muue. converting programi written in other BASICS, improving the picture RAM & l/Ocircuiti. and much more £4 75 Getting Acquainted with your ZX81 75 * piogrami including Draught!, bv Tim Hartndt f4 96 Mastering Machine Code on your ZX81 by Tom Baker 180 page* ot immeme value to beginriei and e>p«rf alike C5 96 n \W wiinv 1 TIME DATA LTD . Dapt G, Swallowdala Baiildon. Euck SS16 5JG Tat. r BUG SPLAT ( P R l * ft ft •• V » m m Cassette One 1K machine code programs: React, Invaders, Phantom Aliens, Maze of Death, Planet Lander, Bouncing Letters, Bug Splat. IK Basic Programs: I Ching, Mastermind, Robots. Basic Hangman PLUS Large screen versions of Invaders and Maze of Death, ready for when you get 16K. Cassette One costs €3.80 CASSETTE TWO Ten games in Basic for 16K ZX81 AWARI T* OAHT or itt-flft I rft *>lbC V
TE 96 ,1 i < < < • • > » . . . • • • • • • JLL . . • • • * • . • • • • • . > . . • . . • • * • • i • * • * i * • IK Chess? Graham Charlton shows you how to do the impossible — squeeze a kind of chess into 1K. This program, which just fits into 1K, allows two players to play chess using the ZX81 as their board. The program can easily be modified to trigger the printer so you have a permanent record of the game. It is very easy to use. When the prompt appears, just enter your move as a string, that is. to • i . . . . . • < • » . . • • • • • • * i • » • < • • • • < • • * • * • * • • • < . • • . • • • • • • • • • » i • • • • » • » 4 1 • • • • • • • « • • « » t 4 • • • • • • • • • • • • • • • • • • • V i V i V i V < 3 move from E2 to E4, enter "E2E4", then press NEWLINE, and the board will be reprinted, with your move shown. You need to enter two separate strings Isuch as E1G1 and H1F1) to castle. Pawns are automatically promoted to Queen when reaching the final rank. The LET I m ^BB^^^^m . .'.'.'.'.'.'a'A 1 1 pieces are: + Rook; X Bishop; $ Queen; £ King and * Pawn. If you have extra memory, you can enter an entire game in one string — M$ — at the beginning of the program, deleting line 60 and adding 1 35 LET M$ « M$ (5 TO). Then the computer will whizz through a game move by move. It is fascinating to watch. You may wish to add a loop to slow things down a bit so you can work out what is going on. 7 6 | 6 5 | • m W S4. 3» 1 J M P 3 2 * * * * * * * 1 Xt£X? + 2 0 P R I N T RT 0 , O ; 3C FOR R«i TO SI STEP 10 4.0 PRINT R5 \'R TO 50 NEXT R 60 INPUT MS 7(3 LET F = 10* (37-CODE DE MS-36 SO LET T = 10 * (37-CODE DE MS(3>-36 9i3 LET RS (T) =R$
Page 1 and 2: j Summer Britain's Biggest Magazine
Page 3 and 4: ZX 80/81 HARDWARE/SOFTWARE ZX KEYBO
Page 5 and 6: ZX Computing is published quarterly
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 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
Page 55 and 56: — 32) limiting the firing to ten
Page 57 and 58: Winning Positions COIN COIN BELL BE
Page 59 and 60: REM "OTHELLO" St_GU GOTO 1103 LET 5
Page 61 and 62: lTURES P&P) ITAL iGUE write to IGHT
Page 63 and 64: ms, arid I time you convince somebo
Page 65 and 66: ist for the feel good luct their 5
Page 67 and 68:
*t»m Tarshis, Executive Vice Presi
Page 69 and 70:
and 2.5 volts. This will produce a
Page 71 and 72:
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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