Silicon ChipMarket Centre - September 1990 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: Your chance to comment on Silicon Chip
  4. Feature: Voice Mail For Your Computer by Marque Crozman
  5. Mailbag
  6. Feature: How To Make Dynamark Labels by Leo Simpson
  7. Review: The Fluke 45 Digital Multimeter by Leo Simpson
  8. Feature: The Bose Lifestyle Music System by Leo Simpson
  9. Project: Remote Control Extender For VCRs by John Clarke & Greg Swain
  10. Feature: The Story Of Electrical Energy; Pt.3 by Bryan Maher
  11. Project: Music On Hold For Your Telephone by Jeff Monegal & Branko Justic
  12. Project: Alarm Power Supply With Battery Backup by Greg Swain
  13. Project: Low Cost 3-Digit Counter Module by Darren Yates
  14. Review: Kenwood CS-6020 150MHz Oscilloscope by Bob Flynn
  15. Vintage Radio: The gentle art of scrounging valves by John Hill
  16. Serviceman's Log: The risk of passing the buck by The TV Serviceman
  17. Subscriptions
  18. Order Form
  19. Feature: Remote Control by Bob Young
  20. Feature: Computer Bits by Jennifer Bonnitcha
  21. Feature: Amateur Radio by Garry Cratt, VK2YBX
  22. Feature: Win A Bose Lifestyle Music System
  23. Back Issues
  24. Market Centre
  25. Advertising Index
  26. Outer Back Cover
  27. Feature: Silicon Chip Survey by Silicon Chip

This is only a preview of the September 1990 issue of Silicon Chip.

You can view 78 of the 128 pages in the full issue, including the advertisments.

For full access, purchase the issue for $10.00 or subscribe for access to the latest issues.

Articles in this series:
  • The Technology Letters, Pt.2 (January 1989)
  • The Story Of Electrical Energy (July 1990)
  • The Story Of Electrical Energy; Pt.2 (August 1990)
  • The Story Of Electrical Energy; Pt.3 (September 1990)
  • The Story Of Electrical Energy; Pt.4 (October 1990)
  • The Story Of Electrical Energy; Pt.5 (November 1990)
  • The Story Of Electrical Energy; Pt.6 (December 1990)
  • The Story Of Electrical Energy; Pt.7 (January 1991)
  • The Story Of Electrical Energy; Pt.8 (February 1991)
  • The Story Of Electrical Energy; Pt.9 (March 1991)
  • The Story Of Electrical Energy; Pt.10 (May 1991)
  • The Story Of Electrical Energy; Pt.11 (July 1991)
  • The Story Of Electrical Energy; Pt.12 (August 1991)
  • The Story Of Electrical Energy; Pt.13 (September 1991)
  • The Story Of Electrical Energy; Pt.14 (October 1991)
  • The Story Of Electrical Energy; Pt.15 (November 1991)
  • The Story Of Electrical Energy; Pt.16 (December 1991)
  • The Story Of Electrical Energy; Pt.17 (January 1992)
  • The Story Of Electrical Energy; Pt.18 (March 1992)
  • The Story Of Electrical Energy; Pt.19 (August 1992)
  • The Story of Electrical Energy; Pt.20 (September 1992)
  • The Story Of Electrical Energy; Pt.21 (November 1992)
  • The Story Of Electrical Energy; Pt.22 (January 1993)
  • The Story of Electrical Energy (April 1993)
  • The Story Of Electrical Energy; Pt.24 (May 1993)
  • The Story Of Electrical Energy; Pt.24 (June 1993)
Items relevant to "Low Cost 3-Digit Counter Module":
  • Silicon Chip article scan, September 1990 - 3 Digit Counter (AUD $10.00)
Articles in this series:
  • Remote Control (October 1989)
  • Remote Control (November 1989)
  • Remote Control (December 1989)
  • Remote Control (January 1990)
  • Remote Control (February 1990)
  • Remote Control (March 1990)
  • Remote Control (April 1990)
  • Remote Control (May 1990)
  • Remote Control (June 1990)
  • Remote Control (August 1990)
  • Remote Control (September 1990)
  • Remote Control (October 1990)
  • Remote Control (November 1990)
  • Remote Control (December 1990)
  • Remote Control (April 1991)
  • Remote Control (July 1991)
  • Remote Control (August 1991)
  • Remote Control (October 1991)
  • Remote Control (April 1992)
  • Remote Control (April 1993)
  • Remote Control (November 1993)
  • Remote Control (December 1993)
  • Remote Control (January 1994)
  • Remote Control (June 1994)
  • Remote Control (January 1995)
  • Remote Control (April 1995)
  • Remote Control (May 1995)
  • Remote Control (July 1995)
  • Remote Control (November 1995)
  • Remote Control (December 1995)
Articles in this series:
  • Computer Bits (May 1990)
  • Computer Bits (June 1990)
  • Computer Bits (July 1990)
  • Computer Bits (August 1990)
  • Computer Bits (September 1990)
Articles in this series:
  • Amateur Radio (November 1987)
  • Amateur Radio (December 1987)
  • Amateur Radio (February 1988)
  • Amateur Radio (March 1988)
  • Amateur Radio (April 1988)
  • Amateur Radio (May 1988)
  • Amateur Radio (June 1988)
  • Amateur Radio (July 1988)
  • Amateur Radio (August 1988)
  • Amateur Radio (September 1988)
  • Amateur Radio (October 1988)
  • Amateur Radio (November 1988)
  • Amateur Radio (December 1988)
  • Amateur Radio (January 1989)
  • Amateur Radio (April 1989)
  • Amateur Radio (May 1989)
  • Amateur Radio (June 1989)
  • Amateur Radio (July 1989)
  • Amateur Radio (August 1989)
  • Amateur Radio (September 1989)
  • Amateur Radio (October 1989)
  • Amateur Radio (November 1989)
  • Amateur Radio (December 1989)
  • Amateur Radio (February 1990)
  • Amateur Radio (March 1990)
  • Amateur Radio (April 1990)
  • Amateur Radio (May 1990)
  • Amateur Radio (June 1990)
  • Amateur Radio (July 1990)
  • The "Tube" vs. The Microchip (August 1990)
  • Amateur Radio (September 1990)
  • Amateur Radio (October 1990)
  • Amateur Radio (November 1990)
  • Amateur Radio (December 1990)
  • Amateur Radio (January 1991)
  • Amateur Radio (February 1991)
  • Amateur Radio (March 1991)
  • Amateur Radio (April 1991)
  • Amateur Radio (May 1991)
  • Amateur Radio (June 1991)
  • Amateur Radio (July 1991)
  • Amateur Radio (August 1991)
  • Amateur Radio (September 1991)
  • Amateur Radio (October 1991)
  • Amateur Radio (November 1991)
  • Amateur Radio (January 1992)
  • Amateur Radio (February 1992)
  • Amateur Radio (March 1992)
  • Amateur Radio (July 1992)
  • Amateur Radio (August 1992)
  • Amateur Radio (September 1992)
  • Amateur Radio (October 1992)
  • Amateur Radio (November 1992)
  • Amateur Radio (January 1993)
  • Amateur Radio (March 1993)
  • Amateur Radio (May 1993)
  • Amateur Radio (June 1993)
  • Amateur Radio (July 1993)
  • Amateur Radio (August 1993)
  • Amateur Radio (September 1993)
  • Amateur Radio (October 1993)
  • Amateur Radio (December 1993)
  • Amateur Radio (February 1994)
  • Amateur Radio (March 1994)
  • Amateur Radio (May 1994)
  • Amateur Radio (June 1994)
  • Amateur Radio (September 1994)
  • Amateur Radio (December 1994)
  • Amateur Radio (January 1995)
  • CB Radio Can Now Transmit Data (March 2001)
  • What's On Offer In "Walkie Talkies" (March 2001)
  • Stressless Wireless (October 2004)
  • “Degen” Synthesised HF Communications Receiver (January 2007)
  • WiNRADiO: Marrying A Radio Receiver To A PC (January 2007)
  • PICAXE-08M 433MHz Data Transceiver (October 2008)
  • Half-Duplex With HopeRF’s HM-TR UHF Transceivers (April 2009)
  • Dorji 433MHz Wireless Data Modules (January 2012)
CEN Cash in your surplus gear. Advertise it here in Silicon Chip. amplifiers, TVs & videos. Open Sat. 1 0am-5pm; Sun. 12.30-5pm. 109 Cann St, Bass Hill, NSW 2197. Phone (02) 645 3173 BH or 726 1613 AH. ANTIQUE RADIO ANTIQUE RADIO RESTORATIONS. Your one-stop electronic repair shop. Specialising in restoring vintage radios including chassis rewiring, quality new parts, valves, valve sockets, speakers, transformers, cabinet restoration. Quality secondhand radio dials & parts for most brands & models. About 400 radios in stock for restoration & parts. Every restored wireless is covered by a 2-year warranty on parts & service . French polishing of timber cabinets available. Vintage car radios in valve & transistor types available for restoration. Repairs done on tape decks, FOR SALE WEATHER FAX programs for IBM XT/ATs * * * "RADFAX2" is a high resolution, shortwave weather fax, Morse & RTTY receiving program. Needs CGA, SSB HF radio & Radfax decoder. Also "RF2HERC", "RF2EGA" & "RF2VGA", same as RADFAX2 but suitable for Hercules, EGA & VGA _cards respectively . $35 . * * * "SATFAX" is a NOAA, Meteor & MEMORY EXPANSION 9x4MB -120ns 28.00 -1 OOns 29.50 - 80ns 31.00 - ?Ons 36.00 - 60ns 46.00 -100ns 97.00 - 80ns 99.00 - ?Ons 115.00 - 80ns 94.00 - ?Ons 99.00 - 80ns 550.00 DRAM/DIP 4164 41256 41464 4 x256 1MB -1 OOns - 80ns - 80ns - 80ns - 80ns 9 x256 9x1MB 8x1MBMAC 4167-33 2220.00 TOSHIBA LAPTOP T1 DOOSE 2MB 515.00 T1600 2MB 370.00 T31 OOe 2MB 370.00 T3i OOSX 2MB 370.00 T3200SX 2MB 370.00 T3200 3MB 615.00 T5100 2MB 370.00 T5200 2MB 370.00 COMPAQ 386 -20, 386-25, 386-20e 386-S, 386-33 680.00 4MB MODULES 780.00 4MB BOARDS PS 2 2MB 250.00 30/286,50 2MB 290.00 70E61,121 2MB 290.00 70A21 182.00 296.00 416 .00 448.00 495.00 504.00 544.00 645.00 825 no CYRIX 610.00 650.00 1210.00 WEITEK 990.00 1600.00 1720.00 387SX-16 387DX·20 387DX-33 2.50 2.80 2.90 9.85 9.85 Prices at July 28 INTEL CO-PROCESSORS 8087-2 80287-10 80C287-12 387SX-16 387DX-16 387SX-20 387DX-20 387DX-25 387DX-33 SIMM & SIP 3167-20 3167 -33 4167-25 Sales Tax 20%. Overnight delivery. Credit cards welcome. Suite 205/83 Longueville Road, Lane Cove 2066. PELHAM Q ► ..I D. D. ::, en w ICU ~ 0 0.. a. en -0 II.I IC .£ :::, o6 (D :E~ :5 0. ::C IC (.) !: ~ Cl) 122 '6, u 0 -... ·s ... C Cl) Cl) :0 ..5ll 0 u Q) -~ i:i:i fo6 > <( (/) Ol C Cl) 0 ~ a: ·;;; (D ....Cl) (/) ~ -0 0 (/) 0.. E 0 -~ 0 0 D.<( 0. 0. 0. :::, :::, -i( (/) -i( (/) SILICON CHIP (/) Cl) Ol 0 ..c 2.... C Ol "cii Cl) 0 -i( Q) 0 0 .0 ..5ll 3: 0 -~ ro 1i:i0 (/) Cl) £ 0. .... >, ....Cl) 0 0 ~ >, -0 ..... 0 -~.... E ~ Cl) Cl) (D (/) ai E 0. (/) (/) • Cl) 5, • Cl) • Cl) ► t- Cl) >- ;;:::, ;;:::, 0 .0 .'=2 't (/) > ..I C1l ro > t- .... 0 ~ .... ~ .... ....0. (.) = C1l :::, c x >< C1l ~a cii w w .r:. Cl) cii -~ -o ~o > ..c C1l Cl) (J)N 0 § >Cl) Cl) "C ·<( ~ II) - Cl) C: 0 - :::, II) Cl) ....Cl) .... -0 (',• (/) w~~ ro ow ·;::en a0,c Tel (02) 427 0011 Fax (02) 418 6831 /428 5460 Cl) .... u .... _a, z .... .... Q) ... ...._ o.., Cl)> .E Cl) IC in ..c C1l ......... (.) o. ·- (/) -0 -~ ~ Q.) C1l 0 . - 0.o_CI) ai 0 Cl).- C C .._:::, C Cl) . u O ·- II.I 'It 0 ..I w- t0 ~<p(/)Q) a. IC ~ ~~ Q = WHOOPS! MY 280-BASED PBUFF printer buffer just doubled its memory capacity again . Over 3000 kits now sold. Combinations of DIP/SIPP/SIMM DRAMs in 9 memory sizes up to 2Mb . Rev J board, Ver 4.3 EPROM and instructions $39. Cable board $9. P&P $3. Serial board and many other options available. Send a 43c stamp for a free catalog to: Don McKenzie, 29 Ellesmere Crescent, Tullamarine 3043. KITS AVAILABLE FOR the ETI Digi125 $17 .95 plus $2.50 p&p . Heatsink not supplied. Kits built and repaired . Repairs to radio control toys. Model railway projects designed and built. Prototype and production board supplier to the hobbyist. Supplier of PCBs for projects in SILICON CHIP. Electronic Toy Services, 2/111 Glynville Drive, Hackham West, SA 51 63. Phone (08) 382 8919. BREAKOUT BOXES. Datacom Technologies, lifetime warranty. From simple BOB to LAN testers and data tool, multifunction tester. Range of products specially suited for the technician. Esckay Printernet (02) 891 1282 or (02) 369 27 48. D. 0. (/) 0 ~ GMS weather satellite picture receiving program. Uses EGA & VGA modes, needs EGA or VGA colour monitor & card, plus "WEATHER FAX" PC card. $45. * * * All programs are on 5.25-inch or 3.5-inch discs (state which) & include documentation. Add $3 postage. ONLY from M. Delahunty, 42 Villiers St, New Farm, Old 4005. Phone (07) 358 2785. I,..,. ,c JILOA (TECHNIKIT DIV.) ACTIVE SHORTWAVE ANTENNA (SILICON CHIP, Jan. 1990) . Complete kit $59; built & tested $119; case $10. LOOP ANTENNA. Improve signal strength & quality with this portable antenna. Kit $44; Fully built $69. PO Box 73, Glenhuntly, Vic. 3163. Phone(03)571 6303. IIT MATHS ,,"Is,-~ COPROCESSORS 2C-08 2C87-8MHz 2C-10 2C87-10MHz 2C-12 2C87-12MHz 2C-20 2C87-20MHz 2C-20H HYPERBOARD 3C-16 3C87-16MHz 3C-20 3C87-20MHz 3C-25 3C87-25MHz 3C-33 3C87-33MHz 'lr ,,o ~{~ 476 .S.s 528 618 645 130 890 915 1148 1380 CLASSIFIED ADVERTISING COUPON Advertising rates for this page: Classified ads - $7.00 for up to 15 words plus 40 cents for each additional word; Display ads (casual rate) - $20 per column centimetre (max. 10cm). Closing date: five weeks prior to month of sale. If you use a PO Box number, you must include your permanent address and phone number for our files. We cannot accept ads submitted without this information. To run your own classified ad, put or.e word on each of the lines below and send this form with your payment to: Silicon Chip Classifieds, PO Box 139, Collaroy Beach, NSW 2097. PLEASE PRINT EACH WORD SEPARATELY, IN BLOCK LETTERS 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ($7 00) 16 ($7.40) 17 ($7.80) 18 ($8 20) 19 ($860) 20 ($9 00) 21 ($9.40) 22 ($9.80) 23 ($10.20) 24 ($10.60) 25 ($11 00) 26 ($11.40) 27 ($11.80) 28 ($12 20) 29 ($12 60) 30 ($13.00) 31 ($13.40) 32 ($13.80) 33 (14.20) 34 ($14.60) 35 ($15.00) 36 ($15 .40) 37 ($15.80) 38 ($16.20) 39 ($16.60) 40 ($17.00) 41 ($17.40) 42 ($17.80) 43 ($18 20) 44 ($18.60) 45 ($19.00) 46 ($19.40) 47 ($19.80) 48 ($20.20) 49 ($20.60) 50 ($21.00) 51 ($21 .40) 52 ($21.80) 53 ($22.20) 54 ($22.60) 55 ($23.00) 56 ($23.40) 57 ($23.80) 58 ($24.20) 59 ($24.60) 60 ($25.00) FIVE YEAR WARRANTY CAD CONNECTION PHONE (02) 957 6719 FAX (02) 954 5550 MEMORY EXPANSION. Upgrade your PS2. Toshiba Laptop, Compaq, IBM Laser, HP Laser, PC compatibles and DEC equipment. You can choose from genJine or compatible chip equivalents. Ring today for an up-todate price list. Esckay Printernet (02) 891 1 282 or (02) 369 27 48. Don't delay. · UC3906 IC SOFTWARE: from the author of the SLA Battery Charger in SILICON CHIP, March 1990. Allows you to quickly design a charger for any SLA battery between 4V & 30V. Available on 5.25-inch 360K disc for IBM XT/ AT (GWBASIC required), C64/C16, Apple II (FPBASIC required) with instructions. $19.95 each (please specify computer) . Only from D. Yates, PO Box 134, French's Forest, NSW 2086. Name ........ ... ... ... ... ..... ............. ... ...... ... .. ..... .. . Street Postcode Suburb/Town Enclosed is my cheque or money order for$ ................ .. . . D Bankcard D Visa Card Signature .......... .......... , ...... . ROBOTICS: experimenter's kit. Includes IBM-PC controller, PSU, stepper motor, manual, software $99. Digital voice recorder TMS-334 7 chips $25. PROJECT PCBs: ETI-DIGI 125 audio amp $9/pair, ETl-1623 IBM PIA card $39. 95, 6502 / Z80 / 6809 miniprocessor $49. PRE-BUil T AUDIO AMPS: 3.5W LM380 $20, LM1875 $30, 150W .... or please debit my D MasterCard Card expiry date ..... ../ .. . FAX THIS COUPON WITH YOUR CREDIT CARD DETAILS TO (02) 979 6503 IC-150 $99, 300W IC-300 $179, 60W Valve-1 $99, 200W Valve-2 $199, Audio ToolkitTool-1 $69, FET-1 super quality stereo preamp $20, Bass & Treble $23. PC Computers, 36 Regent St, Kensington, SA. Phone (08) 332 6513. SMARTWORK POST-PROCESSOR: if you own a HP? 4 7 5 or compatible flat bed plotter you can plot your own PCBs direct on blank board ready to etch. PP plots 1: 1 and mirror image. Only $99. PC Computers (08) 332 6513. continued next page SEPTEMBER 1990 123· r?CF~EEPosT-su11scRIPTio~-co~;o~-----. To: Freepost 25, Silicon Chip Publications, PO Box 139 Collaroy Beach, NSW 2097, Australia. NO POST AGE ST AMP REQUIRED IN AUSTRALIA. □ New subscription Adroit Electronics ..... .. ... ... . 122 Altron ics ............. ..... ...... 68-7 3 Arista .... ...... ..... ... ..... .. .... .... 45 Back Issues ..... ....... ... 118,119 Board Solutions ........ 4 ,5,57,59 Start in _ _ _ _ _ _ __ [J Renewal Name _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ (PLEASE PRINT) Street _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ Bose Australia ..... .. ..... 104 ,105 Cad Connection ........ .. ...... 1 23 David Reid Electronics ...... IFC, 1 52, 53 Dick Sm ith Electronics ... .. 1 0 -1 5 Electronic Solutions .... .... 46,4 7 Elmeasco .. ..... ... .. ........... . OBC Suburb/town _ _ __ _ _ _ _ _ _ _ _ _ Postcode_ _ __ year ( 1 2 issues) □ $A42 Australia 2 years (2 4 issues) □ $A84 NZ & PNG (airmail) □ $A65 □ $A130 Overseas surface mail □ $A62 □ $A130 Overseas airmail □ $ A 1 20 □ $A240 Force Electronics ....... 110, 111 Geoff Wood Electronics ..... ... 23 Enclosed is my cheque/money order for $ _ _ _ _ or please debit my u U Visa Card Bankcard CardNo . l~ ~ ~ 0 MasterCard ~I ~I~~_] l~~~~I ~I~~~ Signature _ _ __ _ _ _ _ _ _ _ _ Card expiry date _ ~ - - Note: all readers who have a valid subscription as at 12th December, 1990 are automatically included in the draw for the Bose Lifestyle Music System (see pages 104-105). L __ ___ _ _ _ ___ _ _ _______ __ _ _____________ j DIGIT AL WAVEFORM GENERATION: as described in SILICON CHIP in March, May, June & July 1990 . PC board and software to generate waveforms. Both for only $39.95 including p&p. Instructions included. PC Board $16 .00, Software $32.50 including postage. Send cheque or money order to M. Radvanyi , PO Box 49 , Kingswood, NSW, 2750. FOUR ONLY MARCONI TF995A5 AM /FM signal generators. 200kHz to 220MHz in 5 ranges . 1 00mV1µ V. Clean with copy of service manual, $375 ea. TWO ON LY ST A TIC INVERTERS 48V DC input at 2A. Sinewave 1 % . Brand new , never used, Lynden PD 48-240-2RSA. Suit environmentalist. 1 9 -inch rack mount. Metered. $400 ea. FOUR ONLY HAND-HELD megger testers . Battery operated . Two units are BM7 -500 (tests insulation resistance to 1 00MQ at 5.00V DC); other two units are BM7-250 (50MQ at 250V DC) . Ideal for electricians and for testing tel.ephone safety . As new in leather cases , battery operated, complete with leads . $80 ea. 124 SILICON C HIP Advertising Index I I I I I I I 1 I TWO ONLY Y AESU YC-500S frequen cy counters. 1 0 Hz to 500MHz. Used, without manual , operational. $200 ea. TWO ONLY AVO AM/CW signal generators. Model CT- 3 78 . 2MHz to 225MHz . $ 150 ea. ONE ONLY A WA GAIN measuring attenuator. 80dB rang e, metered . Type No . 5AR8030 . $ 50 . ONE ONLY MARCONI UHF attenuator. DC to 1GHz; 0-1 4 0dB, 1 0dB & 1 dB steps. Type TF 21635. $300 . ONE ONLY HEWLETT PACKARD AM /CW signal generator. 10-4 50 MHz . ModelHP608C . $250 . Call fax or write to: AV-Com m Pty Ltd, PO Box 386 , Northbri dge 2063. Fax (02) 949 7095 . Phone (02) 949 7 41 7 (answering service) . WANTED W ANTED: ELECTRONICS Australia TV field strength meter. P Allford , Derby 7264. Phone (003) 5 4 2 138 . WANTED : HD6481 80 OR 2800 ch ip & RAM disk software for Mictrotrix system . 26 Bunburra St, Parra Hills West 5096 . Phone (08) 25 0 1869. Harbuch Electronics .... ... ...... 77 Hycal Instruments ...... ... ... .. 123 Jaycar Electronics .. .. ..... . 36 -39 86 -89 Jiloa .. .. ..... ........ ....... ... ..... . 122 J.V. Tuners ....... ......... ...... .. . 77 Kalex ....... .. ......... ... ........ .. 113 Oatley Electronics .. .. .. ..... .. .. 8 1 PC Marketplace .... .. .... ..... .. 1 03 Pelham ... ...... ........ ... ... .... .. 122 RCS Radio .... .. .. .... .. ..... ... ... . 7 8 Resurrection Radio ... ........ ... 65 Rod Irving Electronics .... 28,29, 96 ,97 , 114,115 Silicon Chip Binders .... ..... OBC Silicon Chip Subscriptions ... 79 Sound Australia .. ... .. .. .... .. ... 58 Subscriptions ... ....... ...... .. .. . 79 Tech-Fast ....... .... .... ... ..... .. . 63 Westinghouse . . . . .. .. . . . .. .. . .. 1 09 PC Boards Printed circuit boards for SILICON CHIP projects are made by: • Electronic Toy Services, 2/ 11 1 Glynville Drive, Hackham West, SA 5163 . Phone (08 ) 382 8919. • Jemal Products, 5 Forge St, Welshpool , WA 6106 . Phone (09) 350 5555. • Marday Services, PO Box 19-189, Avondale, Au ckland, NZ . Phone 88 5730. • RCS Radio Pty Ltd, 6!;i1 Forest Rd, Bexley, NSW 2207. Phone (02) 587 3491 .