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ZX80 4 36 5 IF P 1 THEN LET A (Z + 3) - 0 4367 IF P m 1 THEN LET A (Z - 2) - - 2 4370 IF P m 2 THEN LET A (Z + 14) - 0 4375 IF P - 2 THEN LET A (Z + 16) = _ 2 4380 IF P m 3 THEN LET A (Z + 13) - 0 4385 IF P = 3 THEN LET A ( Z + 18) = - 2 4390 IF P > 0 THEN LET A (Z + 8) " 0 4 395 GOTO 2 4405 LET A ( Z + 10) - - 2 4410 LET A(Z + 5) = 0 4420 LET A(Z) - 0 4425 LET SI = SI + 1 44 30 GOTO 2 9000 DIM A(45) 9005 FOR Z = 1 TO 45 9010 IF Z < 6 THEN LET A(Z) = 9 PUN 9020 IF Z > 5 AND Z < 19 THEN LET A(Z) = 1 9030 IF Z > 18 AND Z < 28 THEN LET A(Z) = 0 FOR 9040 IF Z > 27 AND Z < 41 THEN LET A(Z) = - 1 Games CON! GOSUB GOTO 9050 9060 9070 9080 9090 9095 9100 9110 9120 91 30 9140 9150 9160 9170 9180 91 90 IF Z > 40 THEN LET A(Z) - 9 NEXT Z LET A (14) - 9 LET A (2 3) - 9 LET A(32) = 9 LET V$ - LET P " 0 LET F$ RANDOMISE LET SI = 0 L£T SW = 0 PRINT "DO YOU WANT FIRST MOVE? (Y OR N)" INPUT J$ CLS IF NOT 3$ = "Y" THEN GOTO 2000 GOTO 2 84 ZX COMPUTING SUMMER 1982
ZX81 HARDWARE 40 KEY KEYBOARD. Kit £20.50 Built £25.75 (RE77) * Proper typewriter style keys. * All legends and graphics in two colours. * No soldering required to ZX81. Plugs in. (RAM/Printer not affected) * Complete with all parts, connectors, feet and comprehensive instructions. 24 LINE IN/OUT PORT. Kit £16.95 Built £18.95 (RE98) * Each line either in or out. * Controlled by BASIC. * Allows printer/RAM to be used without a motherboard. (Motherboard version kit £13.50 built £14.50) 3 CHANNEL SOUND/TIMER BOARD. Kit £16.95 Built £18.95 (RE161) * 3 independent channels. * Controlled by BASIC. * Full range of notes. * Complete instructions with examples provided. * Can be used as a sophisticated timer/counter. MOTHERBOARD. Kit £15.75 Built £18.50 (RE82) * Two connectors on board. * Six connector board. TBA. CONNECTORS & PLUGS * 23 Way female connector for ZX80/1. (RE80) £2.95 * 23 Way male connector. (RE87) £1.30 * 23 Way male connector to fit two female connectors together. (RE90) £1.60 * 30 Way ribbon cable. £1.40 metre. * RAM pack connector. Allows RAM pack to be remote from ZX80/1. RE170. £6.95 built. * In/out connector & sound board connector. (RE78B) £2.95. BOOKS £f TAPES Getting acquainted with ZX81. £4.95 Mastering machine code. £5.95 Programming for real applications. £6.95 Tape for real applications books. £11.44 Send SAE 5" x 7" for free illustrated catalogue. All produces available ex stock (allow 7 days extra for built products. Payment: Cash with order. Or ACCESS/BARCLAYCARD. Official order welcome. Dealers write for rates. All prices include P + P and VAT. Overseas add £1.80 REDDITCH ELECTRONCS. DEPT ZX. 21 FERNEY HILL AVE, REDDITCH, WORCS. B97 4RU. Tel: (0527) 61240.
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j Summer Britain's Biggest Magazine
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ZX 80/81 HARDWARE/SOFTWARE ZX KEYBO
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ZX Computing is published quarterly
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16K-byte RAM pock for massive add-o
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The @*?$1!&£@ RAM pack Dear ZX Com
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I u < o •0 8 & £T © Benchmarks
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1 1© L" 20 30 IN5 5 0 60 80 9C 100
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The Explorer's Guide to the ZX81 IF
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Orbit S M King from Bristol takes y
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ID 15 20 25 30 35 4G> LBV 5 NMER RE
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E" OR Pi="M" THEN GOTO 785 CO)TO 7"
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I first became aware of the bug in
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A. Beasley After using the ZX80 for
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I sr The first few weeks after the
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Page 33 and 34: id (and IC AND )MPUTER" er and >ut
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Page 57 and 58: Winning Positions COIN COIN BELL BE
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Page 61 and 62: lTURES P&P) ITAL iGUE write to IGHT
Page 63 and 64: ms, arid I time you convince somebo
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Page 67 and 68: *t»m Tarshis, Executive Vice Presi
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Page 71 and 72: tng of KE, the the his mg ay. cts i
Page 73 and 74: Review Keyboard Review Crofton's Ad
Page 75 and 76: "The hi-res board seems to go to a
Page 77 and 78: Make the most of IK Chopper Squad R
Page 79 and 80: onic Systems 80/1 ^ / RAMPACK MASSI
Page 81 and 82: 51 IF A(2) «* 188 THEN LET A (Z)
Page 83: 4110 IF (A(Z - 13) = 1 OR A(2 - 13)
Page 87 and 88: 4090 GOTO 9100 5000 GOSUB 9500 5010
Page 89 and 90: I 1K Games 10 LET 20 LET 30 LET 4-0
Page 91 and 92: Etchasketch This very short program
Page 93 and 94: meant the addition to its repertoir
Page 95 and 96: SYSTEM/MULTIFUNCTION COMMANDS BREAK
Page 97 and 98: 270 280 290 300 310 320 IF IF IF IF
Page 99 and 100: Make sure you get every issue of ZX
Page 101 and 102: ZX80 Programs ZX80 fights back Musi
Page 103 and 104: Catch Avoid being trapped by your s
Page 105 and 106: Software Orwin strikes again Casset
Page 107 and 108: ZX81 Software LARGE CHARACTERS REM
Page 109 and 110: Moving graphics Getting into the Mo
Page 111 and 112: Specialist Book§ i Choosing progra
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Page 115 and 116: the new address (in decimal) follow
Page 117 and 118: WHAT CAN I DO WITH 1K? If your answ
Page 119 and 120: Compiler A program whose function i
Page 121 and 122: ZX COMPUTING SUMMER 1982 Computer G
Page 123 and 124: S-100 Name of a bus or connection s
Page 125 and 126: After taking your move the computer
Page 127 and 128: WHAT'S ON NEXT? IN HOBBY ELECTRONIC
Page 129 and 130: are not lost when the ZX81 is turne
Page 131 and 132: ZX Users' Club JOIN YOUR USERS' GRO
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