the upgradeable amp PDF
Preview the upgradeable amp
AN ARGUS SPECIALIST PUBLICATION . . ., M. \ di-;;, \ - - - RF OSCiLLATORS \ á - . . ., GRANNY ISOLATOR THE UPGRADEABLE AMP d * PRICES INCLUDE V.A.T. * PROMPT DELIVERIES * FRIENDLY CIO POWER AMPLIFIER MODULES SERVICE * LARGE S.A.E. 28p STAMP FOR CURRENT LIST OMP POWER AMPLIFIER M DULES Nowenloya BURGLAR ALARM IDEAL for Work- vvorld-wide reputation for quality. reliability and performance at a realistic price Four models Better to be 'Alarmed' then terrified shops, Factories. aIpnovsawtireluarmb sleeunp ttpoal yls .au Inint dtteh Hgeri anFle iheedeasttc os Wfin tkhh eeGn pl acrsoosfme fsipbsarieroi nnPga C l pa rBnicde sha.on Ndb bODyTr imvEe aa crlkilr emctuoitdsee t lo.s pIinnodcwuluesdrt recyo .T mLoeprioasiutdibraelel. TScouhmpaenp nldenat'ir's famo. u.sr' i r'pMteriirnnccdoipenlrne eB Scuturiopgnplalire Adcelabrim,.. S...yFsUteLm.L'sY. Oeretfacfdicye Sbsuu, iHlptpolmieed, Vu meter Open and short circuit proof Supplied ready built and tested. GCUoAnRtrAolN UTnEiEtD. muses microwave radar range OMP100 Mk II Bi-Polar Output power,110 up to 15 niches adjustable by sensihvi, -ontrol watts R M.S. into 4 ohms, Frequency Res- Three position key operated facia switch - oft - test - armed 30 second east and entry delay ponse 15Hz - 30KHz -3dB, T.H D. 0.01°%o, Indoor alarm - Electronic swept (req siren S N R -118dB, Sens for Max output 104dB output á9 500mV at 10K. Size 355 115 >,. 65mm. Outdoor Alarm - Electronic swept Freq siren 98dB PRICE £33.99 - £3.00 P&P. output Housed in a tamper -proof heavy duty meta' case Fit OwaMttPs RM MF1 S00 iMntoo s4- Foehtm Os.u Ftpreuqt upeonwcey rR 1e1s0- B^oianthrng gte hmaeba Clieno sbnfaatritoltuel rurein ePisto awwnhedric orheu qptduroioroevrmid aeelna ftru m2ll0 pc0ro o2nt6tea0ci ntVi oorenlt qs *Motto. ..Qa ponse 1Hz - 100KHz -3dB, Damping Factor -r sit r7lir Fiiil.ir'datr.' pax dnor sensors panic 80, Slew Rate 45V uS. T H D Typical' 0 002%, Input Sensitivity 500mV. S.N R SAVE I l,3B4OO 122885 -125dB Size 300 123 60mm PRICE BKE's PRICE £89.99 £4 OO P&P PRICE £39.99 -t £3.00 P&P. why ne, arils' OMP/MF200 Mos-Fet Output power 200 OMP LINNET LOUDSPEAKERS watts R M S into 4 ohms, Frequency Res ponse 1Hz - 100KHz -3dB. Damping Factor 1 he very best an quality and value. Made specia,ly to suit tuuayo r 250, Slew Rate 50V uS, T.H D. Typical -teed for compactness with high sound output levels Finished in °'.4110 001%. Input Sensitivity 500mV, S N R -lard wearing black oyes'" with protective corners, grille and carry 'candle All models 8 ohms Full range 45Hz 20KHz Site 20" P-1R3I0CdEB £, 6S2iz.9e9 300£3.5105 0P &\ 1P0.0mm. PRICE 15" 12' Ways R M S per cabinet Sensitivity 1W 1 mir dB OMP 12-100 Watts 110d111. Pricef149.99 OMP/MF300 Mos-Fet Output power 300 per pair. watts R M S into 4 ohms, Frequency Res- OMP 12-200 Watts 102dB. Price£199.99 ¡ po3n5s0e, S1Hlezw - R10a0tKe H6z0 V-3 duBS,. DTa Hm pDingT Fyapcictaolr per pair. De'.. , tia. . cor £800 per pan 0.0008°o, Input Sensitivity 500mV, S N R -130dB, Size 330 s 147 102mm PRICE 19" STEREO RACK AMPS 1 K -WATT PRICE £79.99 - £4.50 P&P. SLIDE DIMMER IY-.-.- Control loads NOTE Mos Fets are supplied as standard it OOKHz bandwidth & Input Sensitivity 500mV1 If required to 1Kw -- ce (50K H; '-.indwidih & Input Sensitivity 775mV) Order Standard or PA * Compact Size Vu METER Compatible with our four amplifiers detailed above A Easy snap in fix very accurate visual display employing 11 LED diodes (7 green 4 ing through panel rceirdc)u pitlsu sfo ar nv eardyd fiatiostn raisl eo na onfdf idnedcicaayt otirm Seosp Thoisutigcha tmedo uloldgeicd c polnatsroticl c Ianbsiunelat tceudt opulatstic case with tinted acrylic front Size 84 27 45imn Professional 19" cased Mos-Fet stereo c*asFeull wave con- PRICE £8.50 ' 50p P&P. amps. Used the World over in clubs, pubs, trol using 8 amp discos etc. With twin Vu meters, twin triac * Conforms to LOUDSPEAKERS 5" to 15" up to400 WATTS R.M.S. toroidal power supplies, XLR connections. BS800 MF600 Fan cooled. Three models (Ratings Suitable for both resist- CLSo.aAub.dEins.pe (et2 aF8kipxe)ir nsfog ar ivfnrae isleat obdcleekt .ai niHlcsul.ugdein sge Cleacbtiinoent oPfl aMncsK. Leanrzgiee RMM.FFM24.0S000. i n((12to00 004 o ---h 2m100s00)1.1 iWW... ££212689.805i0 SeDc-eulirviceoryr anidnniusdcmcueose 'astrrna ytdhb elienatd tahruepecspt i hvleiecotc amlotiaoedn sas Innind- P8 O5W0 EWRA RTATN RG.EM.S Hi -Fr Disco. MF600 (300 ' 3001W. £274.85 £10.00PRICE £13.99 - 75p P&P 62K0H ozz Smeangsn e9t2d1B PRaICllyE v/1o0ic9e9 cAovda iGlarboieu nwdi tahl lbyl aficxkin ggr eillsec £u1tc1h e9o9n P R&ePs £ F1r e5y0 4e0aHr Fret] Rirsp to 12 100 WATT R.M S Hi -Fi Disco BSR P295 ELECTRONICTURNTABLE 50 oz magnet 2" ally voice coil Ground ally fixing escutcheon Die cast chassis White cone Res F2r5eqHz Frey Resp to 4KHz Sens 9548 PRICE 128 60. £3 00 P&P ea MM1i1i,1,1.1,111, pl,nler wilt sir oobnet4dro 5rli& t eB3 3eC'l.utr edp rl eiivnveenr P AlAunlsuti McKENZIE skate thus devic el o Adjustable counter balance * [ 122a Bll5y vWoiAceT Tc oRil .AMll.yS .c eCn1tr2e8 d5oGmPe L Reeasd Fgrueiyta 4r5 kHezy bForeayrd R Desispc too.6 5KHz Sens 98dB PRICE £28./6 MSuapnpuliaedl acromm pleSttea nwdiathrd cut -oucta tretrmigpel afitxei n Ogs C. I300 P&P ea Operation 9-14v D.0 65mA 12' 85 WATT R.M.S. C1285TC P.A Disco 2 ally voice coil. Twin cone. Price £36.99 I300 P&P Res Fret] 45Hz Frey Resp to 14KHz PRICE £29.8., £3 00 P&P ea 13'5 a'-i l1s 5v0u iWceAcoTdT D Rie.M c aSs.i Cch1a5s sBisa sRse Gs uFirtoagr D40isHczo Frey Resp ro4KHz PRICEE54 99 £4 OOP&Pea ADC 04 mag cartridge for above Price 14.99 ea. P&P 500 10- 60 WATT R.M.S. 106OGP Gen. Purpose, Lead Guitar/Keyboard Mid. P.A. 2" ooice coil Res Frey 75Hz Freq Resp to75KHz Sens 99618 PRICE £19 15 £200P&P PIEZO ELECTRIC TWEETERS MOTOROLA 10" 200 WATT R.M.S. C10200GP Guitar. Keyboard, Disco. Join the Piero revolution The low dynamic mass inu voice coili of a Piezo tweeter pri,i; 2" voice coil Res Frey 45Hz Frey Resp to 7KHz Sens 101d8 PRICE £51 00 £3 00 P&P mproved trait5ienl response with a lower distortion level than ordora.0 dynamic tweet," 15" 200 WATT R.M.S. C15200 High Power Bass. crossover is not required these units can be added lo existing speaker systems of up to 1/'. Res Freq 40Hz Frey Resp to 5KHz Sens 101dB PRICE £59 45 £4 00 P&P (more if 2 pill or senesl FREE EXPLANATORY LEAFLETS SUPPLIED WITH EACH TWEETER 15" 400 WATT R.M.S. C15400 High Power Bass. TYPE 'A' (KSN2036A) 3" round with protective wire Res Freq 40Hz Freq Resp to 4KHz Sens 102dB PRICE £85 00 - £4 00 P&P mesh ideal for bookshelf and medium sized Hr fi speakers Price £4 90 each 40p P&P W51".E .7 Mv0o iWceA cToTd RR.e Ms .FSr oMgu 5lt2ipHlez AFrrreaqy RDeisscpo t oe t5cK.Hz Sens 89dB PRICE £19 99 fl 50 P&P ea 1'1 Tp£Yu5r.P9pE9o s'eBea ' sc(phKeSaNk1e40r0sp0 d5PiAs&)cP o3 'a:.n" ds uPp eAr shyosrtne mFos re gtce nPerircael 81 "1 v5o0i cWe AcoTiTl R Re.sM F.Sre. qM 4u8ltHipzl eF rAeryr aRye Dspis ctoo 5eKtcH.z Sens 92dB PRICE £29 49 £1 50 P&P ea TYPE 'C' (KSN6016A) 2" 5" wide dispersion 10" 300 WATT R.M.S. Disco - Sound re.enforcement etc. horn For quality Hi fi systems and quality discos etc 112"" 3v0o0ic eW cAoTilT R Res.M F.rSe.q D 3is5cHoz SForeuqn dR rees p-e tnof o4rKcHemz eSnetn est c9.2dB PRICE £33 49 ' £2 00 P&P ea TPYricPeE £ '6D.9' 9(K eSaNch10'2450Ap) P2&"P' 6" wide dispersion 1' " voice cod Res Freq 35Hz Freq Resp to 4KHz Sens 94dB PRICE£41 49 - £3 00 P&P eii horn Upper frequency response retained extending clown to mid range 12KHz) Suitable for high quality SOUNDLAB (Full Range Twin Cone) Hi h systems and quality discos Price £9.99 each 5" 60 WATT R.M.S. Hi -Fi Multiple Array Disco etc. 40p P&P 1" voice coil Res Frey 63Hz Freq Resp to 20KHz Sens 86dB PRICE I9 99 ' £1 00 P&Pe,i TYPE 'E' (KSN1038A) 3'," horn tweeter with 61'" v""o i6c0e WcoAdT RTe Rs .FMr.eSq. 5H6i H-Fzi FMruelqti pRlee sApr rtaoy 2 D0KisHcoz eStecn.s 8948 PRICE/10 99- £1 50 P&P ea attractive silver finish trim Suitable for Hi-fi monitor 8" 60 WATT R.M.S. Hi -Fi Multiple Array Disco etc. systems etc Price £5.99 each 40p P&P 110';"" v6vo0oi ciWcee Ac coToilTi lR RRees.Ms F F.rSore.g q H3 3i8 5-HFHziz FD Friesreqcq oR Reeestcps.p t oto 2 01K5KHHz zS Senesn s8 98d9Bd BP RPRICIEC E/1 £21 969 49- £- 1£ 250 0 P0& PP& ePa LmEqV pEla8Lt 5eC .m OleNmveT PlR crOoicnLet r C£ool3 ma.9nb9din ceasb oinne ta i nrepcuet slascekd smocokuentt 1 llfl HOBBY KITS. Proven designs including glass STEREO DISCO MIXER elerepwwww--., .. fibre printed circuit board and high quality components complete with instructions. STEREO DISCO MIXER with 2 5 band L & UP.< 44414 FM MICROTRANSMfTTER (BUG) 90/105MHz with very sensitive R. graphic equalisers and twin 10 segment i/ r microphone. Range 100/300 metres. 57 x 46 x 14mm (9 volt) L E D Vu Meters Many outstanding features 5 Inputs with individual faders providing a Price: £8.62. 75p P&P. 3 WATT FM TRANSMITTER 3 WATT 85/115MHz varicap controlled useful combination of the following - ar. professional performance. Range up to 3 miles 35 x 84 x 12mm 3 Turntables (Mag), 3 Mies, 4 Line plus Mic 1 1SRR1IEeN2cCG evELiovIEVlet)Er PRoruC i2ctHp7euMA: tfNH o1Nzp4.Ee .R4Lra9at+ne gs7Re 5r AuepDpl aP ItyO&o wP5.i0th0C 2mOaeNmtTrpeRs/2O. 4DL0Lo EuvDobllet ccooTndRteaAdcN tmsS.o MIdduTelTaatEl iofRonr/. wPpuaittnh 7 Pt7ao5lktmP LroVi cv& See Ri rz£ se1Mw 33ai46tsc0.t9he9 rH O-2e £u8at30dp pu0ht0 co 9Pon0n&met PrmMolos nOituotr t i* many applications. Receiver 90 x 70 x 22mm (9/12 volt). Price: £17.82Transmitter 80 o 50 x 15mm (9/12 volt). Price: £11 .29 3 watt FM B. K. ELECTRONICS P&P + 75p each. S.A.E. for complete list. Transmitter DEPT ETI POSTAL CHARGES PER ORDER £1.00 minimum. OFFICIAL ORDERS WELCOME. SCHOOLS. COLLEGES. GOVERNMENT UNIT 5, COMET WAY, SOUTHEND-ON-SEA, BODIES. ETC. PRICES INCLUSIVE OF V.A.T. SALES COUNTER VISA/ACCESS/C.O.D. ACCEPTED. SS2 6TR TEL: 0702-527572 cit 'ni,, INTERNATIONAL JUNE 1986 VOL 15 N0 6 EDITORIAL AND ADVERTISEMENT OFFICE 1 Golden Square, London W1R 3AB. Telephone 01-437 0626. Telex 8811896. FEATURES DIGEST 7 FIBRE OPTICS AND LASERS ... 24 We DIG deepEST (ouch!). Roger Bond continues communi- cating. READ/WRITE 16 The consequence of foolishness... GRANNY ISOLATOR 52 A circuit solution for all those with noisy grandparents, by Andrew RF OSCILLATORS 19 Armstrong. Hand on Hartley, Joe Pritchard gives his verdict on radio frequencies. They're the Colpitts. (Don't all TECH TIPS 54 Clapp). Designs of de times. Gary Herman: Editor Ian Pitt: Deputy Editor Paul Chappell: Project Editor PROJECTS Jerry Fowler: Technical Illustrator Paul Stanyer: Ad. Manager Duncan Neilson MIDI -CV CONVERTER 29 structional details of this VLF Classified Sales Executive Robert Penfold describes a project transceiver. Andrew Sellwood: Copy Control to breathe digital life into analogue Dave Bradshaw: Group Editor synths. 80M DIRECT CONVERSION - Electronics Peter Welham: Managing Director RECEIVER 44 UPGRADEABLE AMP 34 S. Niewiadomski practices what he Graham Nalty introduces the amp preaches by building the 80m you can amplify on. receiver. PUBLISHED BY: Argus Specialist Publications Ltd., 1 Golden Square, London W1R 3AB. THE ETI TROGLOGRAPH 38 DIGITAL SOUND SAMPLER.... 48 DISTRIBUTED BY: Mike Bedford brings you the con- At last, the digital board. Argus Press Sales & Distribution Ltd., 12-18 Paul Street, London EC2A 4JS (British Isles) PRINTED BY: ETCETE RA The Garden City Press Ltd. COVERS DESIGNED BY: Argus Press Design. COVERS PRINTED BY: REVIEWS 60 SCRATCH PAD 62 Alabaster Passmore. We review the smallest CD player in Flea -byte jumps back. Member of the the world. ABC Audit Bureau of Circulation OPEN CHANNEL 61 ALF'S PUZZLE 63 Electronics Today is normally published on the first Fri day in the month preceding cover date .. The contents Keith Brindley on the line. Alf builds his pma-po. of this publication including all articles, designs, plans. drawings and programs and all copyright and other in tSeplleecciatulisatl Ppurobplicearttiyo nrsig Lhitmsi ttehde.r Aeliln r ibghetlso ncogn tfoe rArerdg ubss PLAYBACK 61 the Law of Copyright and other intellectual properts Andy Armstrong Cs D different CD CROSSWORD 66 rights and by virtue of international copyright conven tions are specifically reserved to Argus Specialist techniques (groan)!. Publications Limited and any reproduction reawres the prior written consent of the Company. © 1986 Argus Specialist Publications Ltd L All reasonable care n taken in the preparation of the magazine contents, but INFORMATION the publishers cannot be held legally responsible for errors. Where mistakes do occur, a correction will nor really Ile published as soon as possible afterwards All prices and data contained in advertisements are a, cepted by us in good faith as correct at time of going to COUPONS 6 PCB FOIL PATTERNS 56 press Neither the advertisers nor the publishers can be held responsible, however, for any variations at tectmg NEXT MONTH'S ETI 12 CLASSIFIED ADS 64 pliorinc eh aosr aclvoasieladb filoitry p wrehsicsh may occur after the pubbs,i READER'S SERVICES 51 AD INDEX 66 Subscription Rates. UK: f18.10. Over- PCB SERVICE 55 seas: £22.50. USA: $29.50. Airmail: L49.50. 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4bSu0liean0lgK 8l,e0 4 040 0K t0r. aKDc. okDu Dobuolebu lbseil dese isddied 4de0d;80 track sw:+citaf£012b120l14es6 WHEPapaeprs edosrwt,noa c&rIken M tt&ehi retSsf afuoucbfltelwi s rCaahrnia)eg,b elDliek ioe,s f,kD BDeuBtitsseCcts CDM, oPriicvvrrieenosrt spe (,erT sCro,ip paph srqeisunreaatetlltisret,y. 444444444444000000000000676667766667112782303690 582083782222222206000500000 444440444404555555555555433233222333101724689689 1328257s4898788550000505000 OOOBB7RSCSs1PPRRCi1LLEroWXPPeP1OOmF26d1327OL5T1Ta92p1IEPTroT CTElnEaOTeD DRnI V OStO1232sE 2p52288.pC .0l050O56itocicpamatii pclFLLLS 3633oaSCCCNw" n lw G 2DDDOieSG2ti cnrw5 t /r46ehct3 0eisGh te'0ecDD, R nhnsrDiiegg em CiCdilgettu ssAAinCtlasCArAt o11214561 2225R31539259290050055s5055 f11o00p MMQTaAiDDnnWu45IIFcISd alSuSSDI CNlC siiiMotn ni ayIoDguNgeb nl5bielTnls ee lo ucEe"sd f S e R rDdSatliiov rFdiliise csdvAeheosceeo Cc msD( wuCSoDEpsoineat oeruhKdcweu ub yIPnd bTnloweerol cuiecinv wotrDo hes rDeo m ieCvrPwe nepsaonnsllurw,es riNpdtitieayetprOygr ilv 4y e S4eV 0 aous0A rntp erTt parD :aSlcyrcuikvkpepsl iCed7 1in a loin case 101 i lEafCC2Lt£3111oe175a92r) RmTtMfSBtiiocvaoOearakedfbcscOtd w'oll,hseeeKr aia tdn1sC)rSfee6 el,eE arcKie&dtbPo. te BcdlRC(e,wEeE saOe dEa,Rst MucysBPOc,es laPuDMPt tRtgerlFi.eoo ssOSTang, &,hsaMMr eWael So m BshOnoeAimoigcRtnpoahkedDprelrrsy ldWS,ti, cs s,LAC aI)oESi,Etgo piEPPonh hfn, lotRi onpsBrtetO etiEoccen&MuEtar or KtB( r edGEsiG-dte(C,rr Ra sWaaJAmecopsLaraeeyhiCtpdss ir)c--,y,-. 10 M7 Double Side Double Density 80 track £17 ETI JUNE 1986 5 READER'S SERVICES r - - - - - - - - - - - - - - - ---- Subscription Order Form Binder Order Form To: ETI Subscriptions Department, Infonet Ltd, To: ASP Readers' Services, PO Box 35, Wolsey House, Times House, 179 The Marlowes, Hemel Hempstead, Wolsey Road, Hemel Hempstead, Herts HP2 4SS. Herts HP1 1BB. Please commence my subscription to Electronics Today Please send me binder(s) for ETI. International. I enclose a cheque*/Postal Order*/Interna- I enclose a cheque*/Postal Order*/International Money tional Money Order* for the appropriate fee, made out to Order* to the value of £5.20 per binder ordered, made ASP Ltd. out to ASP Ltd (5 please delete as appropriate). 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Herts HP1 1BB. Please supply me with the following photocopies: Please supply me with the following backnumber(s) of ETI Month Year Article Month Year Page No Month Year Month Year Article Month Year Page No Tick box if you require INDEX (cost £1.50) I enclose cheque*/Postal Order*/International Money enclose cheque*/Postal Order*/International Money Order* to the value of £1.60 per magazine ordered, I Order'tothe value of £1.50 per photocopyordered, made made out to ASP Ltd (5 delete as appropriate). out to ASP Ltd (* delete as appropriate). Total money enclosed £ Total money enclosed £ PLEASE COMPLETE YOUR NAME AND ADDRESS IN PLEASE COMPLETE YOUR NAME AND ADDRESS IN BLOCK CAPITALS BLOCK CAPITALS Name Name Address Address PLEASE INCLUDE POSTAL CODE AS APPROPRIATE PLEASE INCLUDE POSTAL CODE AS APPROPRIATE Date of order Date of order Note that the cost is the same for orders from overseas as Note that the cost is the same for overseas orders as for UK for UK orders; overseas orders will be sent by surface mail. orders; overseas orders will be sent by surface mail. PLEASE REMEMBER TO INCLUDE MONTH AND YEAR PLEASE NOTETHATBACKNUMBERSARE HELD FOR ONE WHEN ORDERING. YEAR ONLY AND SOME ARE NOW OUT OF STOCK. --------- Ma THIS COUPON IS VALID UNTIL 30th June 1986 TH-I S- C O-U P-O N- IS- V A-L ID- U-N T-IL 3-0 th- J u-ne- 1 9-8 6- EN - - - ETI JUNE 1986 6 NEWS:NEWS:NEWS:NEWS:NEWS:NEWS:NEWS:NEWS DIGEST Dog Eats Dog Sinclair Research was still in debt to the tune of £20m and that major creditors refused to give the company any more leeway. It Less than a month after the has also been suggested that the computer supplement of one takeover was initiated with the national newspaper predicted active involvement of Dixon's. that Sinclair Research was to The deal adds a further 40% by unveil a direct competitor to the volume of the British home com- Amstrad PCW8256, Amstrad puter market to Amstrad's 20% relieved Sinclair of its respon- and leaves Sugar's company in a sibilities by buying the com- strong position in every sector of pany's home computer assets. the British computer market up The announcement of the £5 m to and including small businesses. deal was made at a press con- With profits of £27.5m forthefirst ference on 7 April, jointly hosted six months of its financial year to by Sir Clive Sinclair, the founder December 1986, Amstrad is and chairman of Sinclair Research almost certainly the UK's leading Ltd., and Alan Sugar, founder and consumer electronics company, chairman of Amstrad Consumer although year-end results will Electronics PLC. probably show a lower total. The surprise move came as the Alan Sugar says that his conclusion of months of specula- company will support Sinclair tion as to the future of Sinclair products for a minimum of five Research. Although separated years. The QL - which has not from the collapsed Sinclair been in production forayear- is Vehicles, Sinclair Research is 80% now formally dropped and rumour owned by Sir Clive Sinclair whose has it that Amstrad's bottom -end personal fortune was severely computers will now be badged eroded by the failure of the C5 'Sinclair'. It is also widely believed electric vehicle. that the Amstrad name will go Sinclair Research had also further up-market with the launch massively over -produced for the of an IBM PC compatible from crisis Christmas of 1984. The sea- the company later this year. sonal nature of the home com- Sinclair Research is now puter trade meant that Sinclair reduced to a holding company could not hope to recover until overseeing three areas of involve- over a year later but the decline in ment in high technology: a sbaeltewse aelnre £a1dy5 iannddic a£t1e6dm a dlousrsin ogf tceolemcpoamnmy uinnicaWtioinncshesptreord,u tchtes The Colour Bytes Per Cent 1985. MetaLab research organisation Blue Towards the end of last year, and the wafer -scale integration Sinclair announced a rescue project which Sinclair and Ivor The launch of Atari's new desk- package involvinga commitment Catt hope will produce a com- top personal computer, the tboy thaikgeh £-s1tr0emet wreotartilhe rosf, DSiixnocnla'sir, mercially viable single chip At the recent Comcex show in 1th0ro4u0gShT a, sm baigy aresp trheosseen mt aa dber ewaitkh- ptoroo dliuttclets, .t oIt os elaetme.s to have been osCiclicrciuospniys wi ncagof etnhr.tei ncuomesp leinte t ahree aU oKf a ing Lcoosm Apnugteelers c, othme pwaonrlyd',s I lBeaMd,- tChoem fmirsotd Aorpep 6le4,. the ZX80 or the The Spectrum 128 was not computer market with Olivetti's launched a laptop PC with integral The 1040ST comes complete tlrsdhaeeeeuslslt n pCociinfthh etreh imldseat armeSgsaienasrc islveyl ae nmei rodn aruioasrgkcnuheogg tuehv na oftatnoliuindl egmg dtr.h ea Itenobs orfmhaefo aicclpereokednme t tt op oatfuon c ttnbehoourneusyv .n i iAnnTccdechoemuer snetfhto'nsrerty m B t Eh-Be uaACrrt ow pirsparh ienhictgaaeoens-t wtpPwaiCtTihnn h y Ao3e Tap1 3tl/ s2i1aoo 4nn- i dana-i ncln th3hnc h1orde huifseo n-c ricn mndeecradhiwvt aer dPensrpi.eCv rTwee Xhss me.eT nsocto dsam ealll- stwfmhoeeiraetah cmpmh r1 ieontMorbee bl he$uyam9stv9eese9s o .a i afrLs o ois6knno8ee c0 -dti0bha 0-oetoe aC5udr2Ptd w0m UDSit.oh TRAs Atttthh aoMeerfi effect, many Sinclair products Computers - have announced major departure for IBM whose 520ST and the new machine is enormous resources and influence more than a match for Com- were being sold at cost price. that the US trading company, dtheaDat leA atmareisls tmr aoudf rthkhayes, Abbmeoyusogtrnhatdd S -tSihneicn lfacaliarc'sitr At1r9ap.dr9ici%nog ts Itlnaokcse.s, hifnoa srw 1rhe9itcu8hr5n i et- d hi toasln df is4rs mat hihnaocvuhes, efulosn ptiinlp n iteohwse., UbAeSlel nmh paauvjtoe br ae shgoirnfedtwe 5da1 r4teo- mTochohed r$oo9mr9ee9's mp mriocuneci thtoa rgva ainnudcn luitnedtdee sgA rama mli g3oaln/.-- tdHsmhrreeaaotaosbddwnccet esfuu kuvn febla,efa iycrlgpml,t e auotiehdtcro . eehk tdSh aaadewisgnne etcdbiaell eldaru aemailsnrinn nesdc e adl ota phl olfiear emftig hi gd1Sseeh id toAn1ht fscpt9afhl r8atitai tol5iist.rt aymhthihs eaaleoaadsss nbr seaa ie.nolgclgtifnete iuongnrapsnd leinloeiyrtgfdas c A t otiosoopfn t nrtagiht.cio kinosT eu ithny e Ieettndoo acc rt.pot,o hArmw oemphfpi ritaUail cebknoS eyiytt tppinIeinBmrorvcooMeIwehtddn .' sudsuo ecb icnsdeeytc e. mi ,t3hc sl1sioi ksw kmeiin oa- eetinyhn v eccioisth oau8 mbbv ti.onel peTucru shh-ntih eoedban r ew tts uoftoe hs orbieegefe r ht5ish ttf,1 e e ioi4nilsrtf ltvtatTieihinmamnRsecdlSesue h 1s P-es t80 dh C b0tb4oahe e0AounattftSbT ne tolel Ter eant rs hv n eis-vaseds aldt uihAadlofeuaniemlv nel tdaaeh i tg rtsae dh tatpnnioiam,s e n ytncahriee s retkdashoh irro iluesniobvrn g ibaeeMgd gyt1.i nt aot25eAea.c00r,tl ETI JUNE 1986 7 NEWS:NEWS:NEWS:NEWS ETI PCB attractive of propositions to a commercial management. Bear- Service ing in mind this and the problems SEND we had last time, we cannot offer any guide as to how long it will be SAE NOW Last month we held -over the before we are able to offer boards for our FREE CATALOGUE PCB Service page, expressing again. We will obviously do our the hope that this did not repre- best to find a new supplier as quic- Or ring: 01-567 8910 for sent the start of a new round of kly as possible. problems with our suppliers. In the meantime, we can only the LOWEST prices on - Our hope was not fulfilled. After suggest that our readers treat this just a few months our new sup- as an opportunity to discover (or CMOS CONNECTORS BOOKS pliers are already finding it dif- rediscover) the joys of PCB pro- TTL REGULATORS TOOLS ficult to cope with the running of duction. For those unfamiliar with LINEAR MICROPROCESSORS PCBs the service. We are happy to say the process, a brief description SCRs SPEAKERS CRYSTALS that they have cleared almost all appears in the article 80m Direct LEDs HEATSINKS SWITCHES of the backlog which had built up, Conversion Receiver in this but they have now terminated the month's ETI. We will also do our NICADS MULTIMETERS RELAYS LOTS LOTS contract and will not be supplying best to find alternative sources for AND MORE any further boards. For this reason individual boards (authors, kit We also STOCK over 30 KITS for we have not printed the PCB Ser- suppliers, etc.) but this is unlikely Timers, Remote Control, Disco Z80A CPU £2.19 vice page again this month. to affect more than a small per- Lights, Temperature Control. etc. (5 for £9.95) + VAT The Service offers a large num- centage of our projects. PLUS a wide range of VELLE- ber of different boards, some of We offer our sincere apologies MAN and PANTEC KITS. them in very small quantities, and to readers for this new round of this is not necessarily the most problems. ELECTRONICS SEND 9"x6"SAE TR 13 BOSTON RD OR CALL AT SHOP MON-FRI 9-5pm LONDON W7 3SJ SATURDAY 10-4pm sia FREE P&P on orders over £20 (UK only), otherwise add 000 75p + VAT. Overses P&P. Europe £2.75. Elsewhere £6.50. Giro No. 529314002. SCHOOL OR LOCAL AUTHORITY ORDERS WELCOME. Goods by return subject to availability. Happy Mmores Part type 1 off 25-99 100 up 4116 150ns 1.25 1.15 1.10 4164 150ns Not Texas .98 .88 .80 be used with a slide -in carrier Versatile 41256 15Ons 2.50 2.35 2.10 which holds power semiconduc- 2114 200ns Low Power 1.75 1.60 1.55 Heatsink tors. In this way, the semicon- 6116 150ns 1.45 1.30 1.20 ductors remain in close thermal 6264 15Ons Low Power 2.85 2.55 2.35 contact with the case when in 2716 450ns 5 volt 2.95 2.65 2.45 Cases position but can be removed 2732 450ns Intel type 2.75 2.45 2.25 easily along with the PCB for 2764 250ns Suit BBC 1.90 1.75 1.70 Lincoln Binns have introduced servicing. The slide -in carrier also 27128 250ns Suit BBC 2.50 2.25 2.05 a range of extruded alu- provides a certain amount of 27256 250ns 3.95 3.75 3.60 minium cases which feature heatsinking on its own, allowing Low profile IC sockets: Pins 8 14 16 18 20 24 28 40 integral heatsinking, optional equipment to be tested for short protection against moisture in- periods outside of the case with- Pence 5 9 10 11 12 15 17 24 gress and a system which allows out the need to extend leads or rig power semiconductors to be up a temporary heatsink. Available now - The ROAM BOARD for the BBC Micro. mounted in thermal contact with A range of end -plates complete Reads Roms via a Low Insertion Force Socket and saves the case walls without the need the cases, along with sealing their contents as files, then reloads a file into its sideways for drilling. Other items such as gaskets which provide moisture Ram as required. feet, mounting brackets, PCB's, protection. The end -plates over- Full details on request. etc can also be attached without lap the external grooves on two drilling and the cases can be slot- sides to retain fittings and to pro- 74LS series TTL, wide stocks at low prices with DIY discounts ted together in various combina- vide support where several cases tions to form larger units. are slotted together. starting at a mix of just 25 pieces. Write or 'phone for list. The external walls of the cases The cases are available in nine have dove -tailed grooves which sizes from 32 x 63 x 40mm up to47 Please add 50p post & packing to orders under £15 and VAT provide the means whereby cases x 108 x 220mm in either a natural to total. Access orders by 'phone or mail welcome. may be slotted together. The or black anodised finish and are Non -Military Goverment & Educational orders welcome. dove -tails also serve as the fins of supplied with matching end- £15 minimum. a heatsink. Various runners slide plates. Prices range from f1.35 to into these grooves to carry rubber f8.80 exclusive of VAT and post- feet, mounting brackets, etc. age. All accessories are supplied HAPPY MEMORIES (ETI), Internally, the cases have a as extras. Newchurch, Kington, Herefordshire, HR5 3QR. series of slots for PCB mounting Lincoln Binns Ltd, PO Box 110, Tel: (054 422) 618 and a further set of dove -tailed Haywards Heath, West Sussex, grooves on one face. These can RH17 5YU, tel 0444-451 418. ETI JUNE 1986 1 NEWS: NEWS: NEWS: NEWS: NEWS: NEWS: NEWS Digitally when the bandwidth has been reduced by a factor of between Assisted two and four. Another possible use for DAN Television (digitally assisted television) is to carry information which would allow sequentially scanned pic- Research engineers at the BBC tures to be transmitted with inter- have proposed a system where- laced scanning (again, to save by high data rate digital signals the bandwidth) and then would be transmitted with the reconstructed. analogue television picture sig- The BBC describe DATVas "... a nal to provide supplementary powerful technique to squeeze LED Displays With information and control. HDTV signals through the bot- Integral Drivers Among the possible uses for tleneck of transmission channels such signals is to indicate which using the sort of technology which parts of a television picture con- will be in our homes in the 1990s". characters and are available only tain movement and which don't. They say they are confident that it Anew range of seven -segment in bright red. The final member of By updating onlythose parts which will play an important role in LED displays from Selectronic the new range is the LTM8494 are moving the bandwidth required establishing a European Broad- feature built-in serial -input driver which has two 14-segment'star- would be reduced. casting strategy for high definition ICs. They come in the same size of burst digits' which are 0.54" high. Early experimental results indi- television. package as existing displays and The integral IC is an M5450 cate that HDTV (high definition BBC Engineering Information therefore offer a net saving in which contains a 35 -bit register, television) picture quality can be Department, Broadcasting House, board space compared with using 35 LEDdriveroutputandabright- achieved using this system even London WIA 1AA- tel 01-927 5432. separate components. ness control. Data input to the The displays are manufactured displays requires two signals, a by Taiwan Liton and come in a clock signal and the serial data. When Richard Branson's Virgin The new Rapid Electronics rLaTnMge8 o5f3 f0ivxe atynpde sL. TTMhe8 L5T2M28x5 d2i9sx-, Each digit is individually address- Atlantic Challenger II attempts to catalogue runs to 96 A4 pages and plays have 11/2, 2 and 3 digits athbele l aasntd c whiall rcaocntteinr useto tore ddis upnlatiyl binrge athke t hAet lwanotrilcd, rite wcoilrld b feo rp acrcoksesd- lists over 3,500 items. They offer roreef sd0p,. e5bc6rit"gi v(he1tl4 yr.,e2 adm ,c mhhi)ag rahan c-dete fcfrio chmieeeing chinyt nimeuwm d vaotalt aisg ere isc e1iv5eVd.. The max- fEullel octf reoqnuicipsm. Aenst wsuepllp alise dp broyv Ridaincagl sTpahomes ectaa -gtdaealo y(g fdureeee sc potoast tcssh cf ho1o.n0o 0als lil,n ocprlrudidveiarnstg.e rLeTdM, 8g3r2e8ePn a, nadn LdT oMr8a3n2g8eK. PT ahree SWtaiStbneleelesy,c, tOro2xn4fi6ocrdsMLhtadirr,eke OtTXheS8q 6uAOarLled,, rtaeasmd aas ,rt Reasantcd-ab cle podlma fnom rtou t nhuiesceiar ttnihoeenw vs e issnystese--l tcroomnipcasn Lietsd,, Heiltlc .F).armRa IpniddusEtrlieacl- four -digit displays with 0.3" high tel 0993 - 73888. grated navigation system. CE0st4a t5eR, BDo, xtteeld 0, 2C0o6lc -h 3e6st7e3r,0 E.ssex OSCILLOSCOPES LABGEAR COLOURNATCH PATTERN GENERATOR COSSOR CDU150. Dual Trace 35MHz Solid State Type CM6038-0B Crosshatch/Grey Scale/Blank Raster Portable 8x10cm display. With Manual .... £200 Mains or Battery ONLY £12 each (P&P £21 TELEOUIPMENT D61 Dual Trace 10MHz With MADanVuAaNlCE OS250TV. Dual Trace 10MHz W£I5ith0 7A.5D-V2A30NMCHEz AM/FM SIGNAL GENERATOR Type SG6f3ibA SM.Ean. uLaAlBS SM111. Dual Trace 18MHz Solid St£a1te00. A22D0VMAHNzCE AM SIGNAL GENERATOR SG628. 150KHz- TSTPdTMEEtiEoaasLLnrpLtEetEulEaa OaOWbOylUlU eUiWItIP hIPAiP MtMMhCME aE MoENnNraNTuTn aTS uElS 5a0x44l4tA3e3 .r.S n SDianinlug gDalleelC T T Torrraapacceceeera 112ti505oMMMn HHH8zxzz 1 S£44WW0o111cili501ittmdhh000 VMP8LA2IA8DH2ED0BE0ITVMLGMORAIEHP£HNIAzXSzCCR WWEIR AOOCCMBBUO BBISTLUUIOSGLLU NAVARAT3TL1OO AGRRB EC A TtNRRyEpT2Re A82AG7N1TE70AOSN LR5 EY5- 2TR-S22yAEp20TRe0MO M/6HBR2HzO. zC1O 5M&S0 6£T4K0146EH43002R34700 0r- Manual £75 (Scratched Case) 480 WAYNE KERR COMPONENT BRIDGE 8521 (CT375) 4lTe YaddPigsEiPt ,P HaMuIL2to5IP 1ra7SnX gD (iLnIGCg.DI TC)AomL pMleUteL wTiItMh bEaTttEerRBieSAsP£ af75n5d) 21RMF0S0A1AD01CRuzAHC-1L O55 300N200IMMK THHHFz:z2 :1U6p0NF4IA V 5(CFLE:a/RDtS1eC rAm /vLOde ClrhiosOmtiomUsn-N 1AoT0fCE 0T0 R3FM 0 T1o0I0Mhm4mE1VR V-3T0T£Vy0£6Mp3V0e5) MARCONI VALVE VOLTMETER TF2600 10Hz-1001iiHz. MULTIMETERS 1mV-300V FSD £40 AAACCAaVoVVVsmOOOOep T88lMeE tMMoeSdkkTe 42lwS 7ECCitxhToo. mmCNppooPbll meea1tttpteeel (erwwMieteiisittlhh i,wt abbirtaayhltte ttvbaeeedarrriisteestessio r&&ni&e sollee.f aalACeddVaassrdO r£££ys 658i8 n&005)g PoTCPuEHPaHtSsI LeMI LIF P(aII£PSPEn5& LSy1CPD OFC 4SuLO5OnT)cLRUtOREioNBUnAGsRRTBuHAti eMReEs GGTEEERNNE EtyRRpAeAT HOTCOR6 Rt6y p1tr y in5p 5eC0a8r V5£Lry£51iIid80neBe01g0so crAAaaVVnrOrgOye i7n sMg2. oCc- daSoesmimel 7pil3lae.rt ePto ow caitkbheo btv aeM tbtueultrtiim ensoe &tAe rCle ( aAcdunsrarelongturaen)££ g341e000. HDHeAAlMMayEE SGGw OOeeSSpCC CIILLoLNLmOOEpSSoWCCnOe OEnPPtQQ EET Ue 62s0I0tP5e3rM.5E.D DuNaulTal TTrraaccee 6200MM£6HH1zz6 With batteries & leads £10 Component Teste £270 All Other Models Available, AVO TRANSISTOR TESTER TT189 Handledw.i tGh Ob(/apN&ttOep r G£ie3Os). NfloeOra IWdns - Os&iNt uinL TsYta r£suItc2intigo.n Cs.omplete ABAetPLcPAOOCLLKLL SOOT A11R00 0 C- O- 11U00N00TMMEHRH zTz IR M(aAEtsaR /SaPbeoriovde/T-imweithPI n&mt£ePo2r v1r£ea65l TfrhCoamOt'sM t hwPehO yUN .yKEo.Nu 't Tshs Shna outC umthAldbeT ernAere LoivsOne aGer brU1ee0Ea 0w,l °dfirot,ohlr/ o ecsurohetme ntehpcreeo v nFaaeRtr niCEet trEsyichC, kocRlpoeI.mwC NoKpooeL dtEgi tiEWimvlee0m c0pitc0rriok cEsne,Lis cnE saoCn gTdaR sdOegrNevtIiscCeoSr mocDPo Ia2RSnd4OdKe il Ft iDibnoERyenS IKdVSGiEsIOMp PlNa SfAoy1.rL 1CR .92oE"4 mUG0Tp1RoE/ Es1REi1tSeN1 ;G v S5iidv9Cee R1so.E 6qinEAuO.Na &CNl i MtaL1ysY 2O8e8 0N£d I3I.c.T 52oGOA leuo RewmodSdtn.l fBMMMBuLLneeeAActtteeeCtCiooooKKnrrr Ss 116S)T000TA000AR ---R 11J6 U0GF00P0RHMIMTEzHOHQzRzU 5E0N0C FYU NCCOTUIONNT GERENSE PR&APT1í4OI1242R78£085540 computers, lust components. millions of them. all easily available by mail order. Size: W125mm. H75mm. 0180mm. Cased. Un -slid. SinelSguare/Triangle. 0.1Hz - SOOKHz. P&P £4 £110 calling or crFeRdiEt Eca crdop tye lneopwho Inneo oSrAdEer rse Jquusirte pdi,c Yk ouup hthaev ep hnoonthein fgo rt oa lpoesent to getyour OCVOaawnsreleiyodn (uy1 s0k e.50y 0bm os"ea Ferdplo ((paPsp& yiPn D £Li2ysn1kx D Mriicvreo£s)5 Paeuntcsdhh S (tPote &mpPpa ki£ne2g) HiPnUc&lNuPdG i9n Cg H1U0 NAGm pD AMCM/D 6C0.1 C0 o3m'hp dleigteit .w Hitha nbdahtteelrdie 2s8 &4r 3alen3ag.d5e0ss CRICKLEWOOD ELECTRONICS LIMITED Motors Available O£2SCILLOSCOPES PROBES. Switched x1: x10. P&P £11 40 Cricklewood Broadway, London NW2 3ET This is a VERY SMALL SAMPLE OF STOCK. SAEor Telephone for Lists. Please check Tel: 01-450 0995/01-452 0161 availability before ordering. CARRIAGE all units f 12. VAT to be addedto Total Goods & Carriage Telex 914977 = STEWART OF READING 110 WYKEHAM ROAD, READING, BERKS RG6 1PL ETI Telephone: 0734 68041 Callers wakensm-5.30 pm Mon. -Fri. (until 8 pm Thurs.) ETI JUNE 1986 9 NEWS:NEWS:NEWS:NEWS BEST PRICE DEVICES ALL THE LATEST FASTEST MEMORIES NOT TO BE CONFUSED WITH SLOWER OLD STOCK OFFERED ELSEWHERE Charging On Developments in the field of DRAM EPROM rechargeable batteries have moved 5v NMOS 150nS 5v NMOS 250nS 441162456 26546kk ox 11 ££21..7250 22773126 24kk xx 88 ££33..2255 Twoof trheece inntt erernpoarttiso nona lt hbea tstteartey jcuasdt masi uqmui ctyklpye. sE xwisiltli nbge nsiuckpeelr -- 4416 16k x 4 £2.80 2764 8k o 8 £1.95 market predict rapid and major seded by a new generation of 4S1R4A6M4 64k x 4 £5.90 2277215268 3126kk ox 88 ££24..8755 changes in the next few years. rechargeable cells based on 5v CMOS 150nS 5v CMOS 250nS In particular, both suggest that lithium -molybdenum disulphide 6116 2k x 8 £1.50 27C64 8k x 8 £8.50 we will soon see batteries which technology. These have around 62648kx8 £3.50 27C256 32k x 8 £15.00 are built into a product and never twice the energy density of nickel - EX - EQUIPMENT MEMORY BARGAINS need changing or re -charging cadmium types and a shelf life Guaranteed UV Erased, Cleaned and Tested during the working life of that nearly ten times as long. They are 4116 16k x DRAM 60p 2732 4k o 8 EPROM £1.50 product. expected to become commer- 1 2716 2k o 8 EPROM £1 50 2764 8k o 8 EPROM £1.50 The two reports come indepen- cially available within the next LINEAR BARGAINS dently from major market research year. TL072CP 50p NE555 19p LM358 39p organisations. They point out that The car battery market will not TTLL0O7842CCNP 8400pp LLMM331214P 3399pp SONP7O571C5P4N .. ..£..1 9.50p0 there have been more develop- be left behind. Already small sealed TLO84CP 85p LM348N 39p ments in the last decade than in units are beginning to replace the the previous four decades and traditional lead -acid type with its REGULATORS that we are already beginning poor cold weather performance 7812 35p 78M12 35p LM337 £1.00 to see 'lifetime' batteries in some and frequent need for topping up. 10% ON ORDERS OVER £25 products such as calculators and The changes which take place in REGARDLESS OF MIX DISCOUNT PLEASE ADD 15% V.A.T. SENT watches. With a new generation the next few years are expected to POST FREE of lithium batteries, soon to go far beyond this. ORDERS UNDER £25 ADD 15% V.A.T. PLUS 50p P&P. appear, this practice could extend The Report "Business Oppor- OVERSEAS ORDERS WELCOME ADD £2.00 P&P TO ALL to devices such as radios, VCRs tunities for Batteries and Battery ORDERS (NO V.A.T.) and computers. Materials" was produced by SRI SEND LARGE S.A.E. FOR LISTS OF 74HC CMOS, 4000 CMOS, MICROPROCESSORS & PERIPHERALS, DISK The new lithium primary bat- International, Menlo Park, Cali- CONTROLLERS, ETC. teries will not only carry more fornia, tel 415 - 859 4276. The energy than existing types, they other report is entitled "Battery TECHNICAL ADVICE, DATA SHEETS, ETC. A PLEASURE PHONE OUR 24 HOUR SERVICE 0933 626420 will also have a much longer shelf Technologies And Emerging life. This is an important con- Markets" and is published by ALL ORDERS DESPATCHED BY RETURN FROM LARGE STOCKS sideration if the battery is to be an International Resource Develop- MICROKIT LIMITED integral part of a product which ment Incorporated, 6 Prowitt may be stored and unused for Street, Norwalk, Conneticutt MANOR PARK RAUNDS NORTHANTS NN96PD long periods. USA, tel 203 - 866 7800. Video Cassette not damage either the cassette or the machine. Once in place, the Lock lock can only be removed with Interak 1 the key provided and the manu- facturers say that any attempt to remove it by force will cause visi- AN EXPANDABLE DISK -BASED There are a number of devices ble damage to the cassette. Z80A DEVELOPMENT SYSTEM on the market which will pre- The locks are brightly coloured vent unauthorised use of a video to provide an immediate visual YOU CAN BUILD YOURSELF! cassette recorder, but this is the indication that a cassette must Universities, Colleges, Industry, Enthusiasts: first gadget we have seen which not be tampered with. They are Unlike home computers, development systems haveentirely locks the cassettes themselves. It supplied in packs of three with "open" architectures, use standard TTL etc. chips (ie no allows cassettes to be protected one key and the recommended ULA's!), and are built in a proper engineering fashion. Usu- ally these superior products carry a correspondingly against accidental erasure or retail price is f2.99. The model superior price tag, but you can build Interak yourself board unauthorised viewing whilst leav- currently available is only suitable by board and thus afford a system which would normally be ing the recorder itself free to replay for use with VHS cassettes but a out of your reach and/or understanding. or record other material. Beta version will be introduced The lock consists of a plastic shortly. They will be sold through 0 0 &9 O disc with spring -loaded tabs which high street newsagents and o'Interak 1's greatest asset - space for expansion o O csplirposc kinett oh oolense. of the cassette deVpiadretmo eCnat sssteotrtees L.ock (UK) Ltd, e This prevents the cassette being PO Box 202, Leicester, tel 0533 - p O (tip to 7 more cares. each4'." 8"I 01 p loaded into the recorder but will 555 180. The 'nitial development system has 64K of RAM, a 4 MHz Z80A CPU, parallel ASCII keyboard interface, VDU Interface (TV set or monitor), and a floppy disk drive interface for up to 4 drives. Any size (including 8" double density) can be used, but our 1 Megabyte 3.5" drives are proving very popular because they can fit into the system rack, (and they only cost £87.00 each + VAT). CP/M 2.2 is available, giving access to thousands of "public domain" programs. The system can be described as "future proof" because it uses plug in 4.5" x 8" cards in an industrial quality 19" 3U rack. We have been established since 1970, and this system was first made in 1977 so (unlike almost all other computers) it has stood the test of time. Send two second class stamps, or telephone for a detailed descriptive leaflet, specification, prices, etc. Greenbank Greenbank Electronics (Dept T6E), 92 New Chester Road, New Ferry, Wirral, Merseyside L62 5AG. Tel: 051-645 3391 ETI JUNE 1986 10
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