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Volume 5Issue 10 Chris Curry of Acorn Talking computers Applesoft compilers Cromemco System One MicroCentre introduce Cromemco's new System One computer, available with an integral 5 megabyte Winchester hard disk, at a new low price. The System One supports the full range of Cromemco interface cards, including high resolution colour graphics, and software packages. The choice of operating systems includes CDOS, CP/M and CROMIX Cromemco's answer to Unix. Call MicroCentre for Q Cromemco 30 Dundas Street MicroCentre Ltd Britain's independent 13 (Complete Micro Systems) Cromemco importer Edinburgh EH3 6JN *Circle No 101 Tel: 031-556 7354 CONTENTS 33 Editorial / CP/M versus Unix 35 Feedback / Spectrum delays; Mathematical induction; Pet quick formatter News 40 Printout / Epson HX-20 business portable; Jupiter Ace homemicro; Hard disc for NEC PC -8000 Chris Cum, of Acorn Talking computers Appkuott compliers Monte Carlo methods Monte Carlo methods - page 78 78 A beginners'guide / Random members are the basis of a powerful equation -solving technique - William Hill seeks order from Editor the chaos Peter Laurie 01-661 3609 Deputy Editor Bill Bennett Reviews Reporter / David Watt looks at a supermicro from California Ian Stobie 45 CCS 300 Production Editor Computer Systems John Liebmann 48 Dragon 32 / Yet another powerful colour computer for less than Sub -editor £200 - Mike Hughes found the Dragon to be more than a toy Sally Nicholls Editorial Secretary 54 Soundchaser / Electronic music is everywhere, from Switched on Julie Milligan Bach to Top of the Pops - David Ellis reviews a computer -synthesis Consultant system based on the Apple II Chris Bidmead Books / Small business systems; Using Unix; Pet graphics Advertisement Manager 189 Ian Carter 01-661 3021 Assistant Advertisement Manager Features Kenneth Walford 01-661 3139 62 Interview / Chris Curry of Acorn talks to Ian Stobie Advertisement Executives Certainly not the BBC Micro / P K Chilvers weighs up Fiona Howell 01-661 3468 111 the Sinclair Spectrum against its BBC rival Robert Payne 01-661 8425 Advertisement Secretary Janet Thorpe Midlands office: Software David Harvett 021-356 4838 85Applesoft compilers / Looked at for us by Roger Hill Northern office: Wordpro revisited / Add extra routines to enhance your Pet Geoff Aikin 061-872 8861 129 word processor - David Osborne did it first Publishing Director Chris Hipwell Game / Airlander, a game from Nicholas Lloyd which puts you in the 147 hot seat as the plane comes in to land Published by IPC Electrical Electronic Press Ltd, Quadrant House, The Quad- 153 Open file /14 pages ofmicrocomputer software for the serious rant,Sutton,Surrey SM2 5AS.Tel: programmer 01-661 3500. Telex grams892084 BIP- RESG. Typeset and printed by Eden Fisher (Southend) Ltd, Southend-on-Sea. Programming Distributedby IPC BusinessPress (Sales and Distribution) Ltd, Quadrant 93 Paged graphics for the BBC Micro/Apparently House, The Quadrant. Sutton. Surrey instantaneous displays, explained by T K Cowell SM2 5AS. Subscriptons:U.K.£12 perannum; Talking computers / Paul Marsden shows how a microcomputer Overseas £18 per annum; selling price in 116 Eire subject to currency exchange fluctu- can be made to produce natural -sounding speech ations and VAT: airmail rates available on application to Subscription Manager, Applications programming for beginners / Arnold IPC Business Press (S & D) Ltd, Oakfield 124 Maughan, himself a programmer, shares his knowledge House,PerrymountRoad,Haywards Heath, Sussex RH16 3DH. Tel: 0444 Data structures using pointers / How to make effective use 459188. 141 ©IPC Business Press Ltd 1982 of memory space, by David Bolton ISSN 0141-5433 Would-be authors are welcome to send articles to the Editor but PC Micromouse / The silicon rodent makes its return with a maze - cannot undertaketoreturnthem. 132 solving method from Roy Sayers Payment is at £30 per published page. Submissions should be typed or Fiction / Hearing Aid by David Langford computer -printed. Handwritten mater- 135 ial is liable to delay and error. Microcomputers buyers' guide Every effort is made to check articles 195 and listings but PC cannot guarantee Puzzle / Can you shoot the smak beast? that programs will run and can accept 190 no responsibility for any errors. 213Random access / Boris Allan investigates 16 -bit chips PRACTICAL COMPUTING October 1982 3 SYSTEMS FROM £4000 accounting for sales, purchase and nominal ledger, invoicing and stock control WORDCRAFT SYSTEMS FROM £3640 full wordprocessing facilities with high -quality printer SILICON OFFICE SYSTEMS FROM £3640 for powerful data management reporting VISICALC SYSTEMS FROM £2900 financial planning with the world's top selling program DIAL A DEMO Adda is the number one choice for business systems using Commodore's 01- powerful 32K or 96K microcomputer with 1 megabyte disk storage (even 997 more with new hard disks!) Our top four software packages will meet most business needs, at prices you can afford. In every case we will help you 6666 Circle No. 102 select the most cost effective software systems backed with Adda's training and servicing skills. You can also see our top four systems demonstrated in your own office! We have a continuous programme of Open Days at all four sales offices Just call 'Dial a Demo' on 01-997 6666 and we'll fix a time. where you can look at our packages without feeling harassed. Give us a call. We know the Adda deal adds up to a great deal more. CITY WEST LONDON SLOUGH READING National Electronics Centre, Mercury House, Hanger Green, 120 High Street, 275 Oxford Road, London World Trade Centre, Park Royal, London VV1513.BiA. Slough, Berks. Reading, Berks. Europe House, London El 9M. C 01-488 2400 01-997 6666 0753 72470 0734 585928 ALL DEVICES FULL SPEC. AND FULLY GUARANTEED. TERMS OF BUSINESS: CASH/CHEQUE/P.O.S. (OR ACCESS) WITH ORDER. GOVERNMENT AND EDUCA- TIONAL INSTITUTIONS OFFICIAL ORDERS ACCEPTED. TRADE AND EXPORT WATFORD ELECTRONICS INQUIRIES WELCOME. (P&P add 50p on all cash orders). Unless stated otherwise. ALL PRICES ARE EXCLUSIVE OF VAT. PLEASE ADD 15% TO THE TOTAL 33/B,CARDIFF ROAD, WATFORD, Herts, England VAT COST INCLUDING P&P. SHOP HOURS: 9.00am-6.00pm MONDAY TO Tel Watford 109231 40588. Telex: 8956095 SATURDAY. AMPLE FREE CAR PARKING SPACE AVAILABLE. Computer FIO 3 2513L 700 7473 24 4069 13 4161 99 4596 290 RO 3-2513U 600 74/4 20 4071 13 4162 ' 99 4599 290 800 7475 32 4072 13 4163 99 40100 215 1702 350 SFF96364E SPECIAL OFFER TMS2716-3 725 7485 604075 13 4174 99 40104 95 1802CP 650 475 7486 20 4076 50 4175 105 40105 115 FLOPPY DISC DRIVES 21122 250 TMS4164-15 TMS6011 385 7489 2054076 50 4411 690 40106 75 +1 +25 2114L 300n 88 7490 20 4077 13 4412 760 40107 60 2114L -200n 88 ULN2003 so 21141-200 80p 75p UDP7002 400 7491 354078 15 4502 60 40108 450 2147-3 425 299 7492 25 4081 13 4503 35 40109 100 2532 350p 330p 2532-450n 350 280CPU2.5 350 7493 254082 13 4511 46 40110 300 2564 E14 280ACPU4M 2732 350p 330p 265 74100 804093 20 4519 30 40114 240 2708 225 280CTC 280ACTC 290 74116 504094 70 4539 90 40163 50 4116-200n 75p 70p 2716-5V 215 280DART 495 74121 25 4095 95 4549 375 40174 ;: 2732-450n 380 74125 70 4572 36 40193 4816-100nS 225p 205p 2764 280ADART 495 35 4096 £13 35 4097 190 4583 99 40244 195 3242 ZBODMA 675 74126 6116 390p 360p 590 74143 210 4098 75 4584 48 40373 240 4027 190 2130P10 260 ZBOAPIO 275 74148 70 4099 75 4585 99 40374 245 6522 300p 280p 4116-150 95 Z80910-1 850 74150 50 4160 95 4597 330 45106 595 4116-200 75 6820/6821 115p 105p 74151 40 4118-250 325 ZBOASIO 980 ZN419CE 74153 40 4164-200 480 190 4334-3 ZN423E 138 74154 ss TEAC FD -50A Single Uncased 40 ZN424E 130 74186 470 We stock thou- ICMOS 21141 325 WATFORD'S BOOKSHOP CORNER track S/sided £125 ZN425E-8 345 74188 250 more 48164-100nS 225 74383 1020 sands 4864-364K ZN426E-8 300 99 6502 Applications Book 490 ZN427E-8 TEAC FD -50A Single Cased 40 track 5101 220 590 6502 Assembly Lang. Programming 1250 items. It pays to ZN428E 410 S/sided £180 6116-150ne 390 2E4429E-8 210 74 LS 6502 Assembly Lang. Subroutine 1200 visit us. We are 61161-120nS 550 ZN459 570 6502 Software Design 950 TEAC FD -50A TWIN Cased 40 track 6117.100n 490 LSOO 11 Just phone yoursituated behind 200 6502 CPU 325 ZN1034E LSO2 11 Programming & Interfacing 6502 1240 S/sided £335 675 order through,the Watford Foot- 6503 600 2N1040E LSO4 12 850 Programming the 6502 1120 550 ZNA234E LSO8 12 TEAC FD -50A Single Cased 80 track we do the rest ball Ground. 6504-250 2102-2 6809 Assembly Lang. Programming 1350 6520 115 100 L510 13 S/sided £238 68021 220 6521 115 13 68K Assembly Lang. Programming 1290 61345 599 6522 VIA 300 RI; 20 68K Microprocessor Handbook '790 SIEMENS FDD 100-5 Cased, Head 6530 RRIOT 68000 E70 L014 30 EPSON Ell 8156 8080280 Assembly Lang. 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