--- title: elwro 800 Junior categories: - Computers types: - Home Computer origins: - Poland years: - '1986' cpus: - Zilog Z80 A params: name: 800 Junior company: /companies/elwro company_name: elwro specs: - label: NAME value: 800 Junior - label: MANUFACTURER value: elwro - label: TYPE value: Home Computer - label: ORIGIN value: Poland - label: YEAR value: '1986' - label: END OF PRODUCTION value: February 1989 - label: BUILT IN LANGUAGE value: Sinclair Basic - label: KEYBOARD value: Full stroke 75 key with 5 function keys and arrow keys - label: CPU value: Zilog Z80 A - label: SPEED value: 3.5 MHz - label: RAM value: 64 KB - label: ROM value: 24 KB (Basic & OS) - label: TEXT MODES value: 32 or 64 chars. x 24 lines - label: GRAPHIC MODES value: 256 x 192 dots - label: COLORS value: 8 with two tones each (normal and bright) - label: SOUND value: 1 voice / 10 octaves (Beeper) - label: SIZE / WEIGHT value: Unknown - label: I/O PORTS value: tape recorder, TV/RF modulator, video RGB, video mono, joystick (mouse, light pen), Parallel Centronics, serial RS-232C, FDD (in 800-3) - label: OS value: CP/J, CP/M 2.2 - label: POWER SUPPLY value: Built-in power supply unit - label: PERIPHERALS value: Floppy disc unit - label: PRICE value: Unknown tabs: - photos - hardware - software - emulators - links - docs photos: - title: ELWRO 800-2 subtitle: '' text: The 800-2 was also available in red colour. The keyboard featured special Polish characters. image: null - title: ELWRO 800-3 subtitle: '' text: www.pawel.tpi.pl image: null - title: SIDE VIEWS subtitle: '' text: '' image: null - title: REAR CONNECTORS subtitle: '' text: |- From left to right:\ • Monochrome monitor output\ • Colour RGB video output\ • Tape recorder DIN socket\ • Reset switch\ • Dual Junet network DIN socket\ • Printer connector (bottom)\ • Joystick connector. image: null - title: OPENED subtitle: '' text: '' image: null - title: MAINBOARD subtitle: '' text: |- **(1)** 8055 and 8035 I/O chips used for joystick, Parallel and network ports\ **(2)** Three 2764 EPROMs hold the Sinclair BASIC and operating system\ **(3)** Z80A CPU\ **(4)** FDD controller card connector\ **(5)** Keyboard connectors\ **(6)** 64 KB RAM chips - 8x4164\ **(7)** Character generator EPROM image: null - title: 'MAINBOARD #2' subtitle: '' text: ICs came from various countries, former USSR for the CPU, I/O and some logic chips, Japan and Korea for EPROMs and other ICs. image: null - title: ELWRO MODEM subtitle: '' text: |- 2400-baud Elwro modem. Needs an external power source. Thanks to **Tomasz Droszcz** image: null hardware: - title: DISCOVERY SYSTEM subtitle: '' text: 'The Discovery system uses the new Sony 3.5'''' diskette to save in full safety the programs and data of the Spectrum or Spectrum+. The diskette has a capacity of 180 KB and a second drive can be installed. The commands of the operating system are similar to those of Sinclair Microdrives. The case includes a power supply and various Spectrum expansion connectors. In short, a lot of hardware qualities, but an incomprehensible defect: the data transfer speed is slower than Microdrives, whereas a disk drive is able to be ten times faster than a tape reader. Discovery did not meet success, certainly for this reason, but also because of its high price, not compatible with the Spectrum''s young users'' purse.' image: /media/museum/hardware/sinclair_spectrum_fddiscovery_1.jpg - title: INSIDE DISCOVERY subtitle: '' text: |- **(1)** Metallic case.\ **(2)** Centronics parallel printer connector.\ **(3)** Spectrum expansion connector.\ **(4)** Discovery to Spectrum connector.\ **(5)** EPROM memory chip holding drive management routines and OS commands.\ **(6)** Sony 3.5'' disc drive. A double side, single density version.\ **(7)** A strange location for the power transformer, under the disk drive and not protected against magnetic fields.\ **(8)** This empty socket receives a 2 Kb. RAM chip when a second disc drive is installed.\ **(9)** 6821 Circuit, in charge of disc drive control.\ **(10)** Each disc drive uses an internal RAM area to avoid using Spectrum RAM.\ **(11)** Atari standard joystick connector. image: /media/museum/hardware/sinclair_spectrum_fddiscovery_ins.jpg - title: INSIDE WAFADRIVE subtitle: '' text: |- **(1)** The Wafadrive unit includes two specially designed cartridge drives.\ **(2)** Each cartridge drive has its own motor and electronic control system.\ **(3)** The Wafadrive offers three expansion ports. Unfortunately, they are not compatible with the Spectrum ones and need special cables.\ **(4)** Centronics parallel printer connector.\ **(5)** Spectrum expansion connector for additional peripherals.\ **(6)** 8 Kb. EPROM holding operating system and Basic drives commands.\ **(7)** The Wafadrive is connected to the Spectrum expansion port. It also uses the computer's power supply.\ **(8)** Power Leds. image: /media/museum/hardware/sinclair_spectrum_wafadrive_2.jpg - title: WAFADRIVE CARTRIDGE subtitle: '' text: '' image: /media/museum/hardware/sinclair_spectrum_wafadrive_3.jpg - title: CHEETAH JOYSTICK INTERFACE subtitle: '' text: Thanks to Peter James for the picture image: /media/museum/hardware/sinclair_spectrum_cheetahjoyinterf_1.jpg - title: KEMPSTON JOYSTICK INTERFACE subtitle: '' text: |- Peter says:\ I'm not sure if this was the first joystick interface for the Spectrum but it defined a standard that was never displaced. Most games carried the words 'Kempston joystick compatible' Says it all really! They later revised the interface to offer 2 joystick connectors Thanks to Peter James for the picture image: /media/museum/hardware/sinclair_spectrum_kempstonjoyinterf_1.jpg - title: DK'TRONICS SPEECH SYNTHESIZER subtitle: '' text: '' image: /media/museum/hardware/sinclair_zx-spectrum_dktronics-speech_synth_1.jpg - title: MAGECO MONITOR subtitle: '' text: It cost 75fr in january 85 (France). image: /media/museum/hardware/sinclair_spectrum_dessas.jpg - title: VTR VOCAL SYNTHESIZER subtitle: '' text: 470fr (France, january 85) image: /media/museum/hardware/sinclair_spectrum_vocal.jpg - title: CURRAH SPEECH subtitle: Vocal synthesizer text: Just type on the keys and the Spectrum "speaks" with two tones, high and low. There is also a sofware support. image: /media/museum/hardware/sinclair_spectrum_vocal2.jpg - title: CHEETAH SPECDRUM subtitle: '' text: |- About the Specdrum, Peter says:\ This was the most fun add-on I ever bought for the Spectrum. You had to connect it to a phono input on a stereo amp, load up the software and away you went. You could enter the rhythm in real time or step time and it had 8 sounds it could play at once. The sound was perfect and still sounds good today. They released some extra drum kit sounds to expand the Specdrum's sound library, Afro Kit and Electro Kit are the ones I remember and purchased. I don’t think any Spectrum should be without this Add-on, it rocks!! Price: About £30 around 85-86 Thanks to Peter James for the picture image: /media/museum/hardware/sinclair_spectrum_specdrum_1.jpg - title: ALPHACOM 32 subtitle: '' text: 'Alphacom 32 is the well-known and the cheaper printer for the Spectrum, offering exactly the same features as the ZX Printer : full Spectrum characters set, 32 char. / line and silver plated thermal paper. Alphacom 32 uses its own power supply. june 84 price : 181 -E- (France).' image: /media/museum/hardware/sinclair_spectrum_alphacom.jpg - title: FLOYD 40 subtitle: '' text: 'Floyd 40, from the manufacturer Shiva Marketing, doesn''t seem to be very reliable with its very thin plastic case and its wooden paper axis ! However Floyd features are better than Alphacom ones: use of white thermal paper more readable and less expensive, only one cable to connect it to the Spectrum (power and data) and better printing quality. Moreover, Floyd 40 has larger characters set and printing options : double height and width, text printing in the four directions and more advanced and accurate graphic abilities (5 x 7 dots head). On the other hand, the printing is rather slow and the print width doesn''t exceed 8 cm.' image: /media/museum/hardware/sinclair_spectrum_floyd40_1.jpg - title: ZX-81 THERMAL PRINTER subtitle: '' text: |- This is a small thermal printer (of very poor quality !). It can print all the graphical characters of the Spectrum and can print 9 lines of text per inch. It was possible to make a hard copy of the screen thanks to the "Copy" command. This tiny thermal printer can also be used with the ZX-Spectrum. image: /media/museum/hardware/sinclair_spectrum_zx81_printer.jpg - title: ZX THERMAL PRINTER subtitle: Box text: '' image: /media/museum/hardware/sinclair_zx81_zx-printer_box_1.jpg - title: ZX INTERFACE 1 subtitle: '' text: |- This interface offers an RS232 connector, a Microdrive connector and a network socket to connect up to 64 Spectrums ! This marvel cost 895fr in june 84 (France). image: /media/museum/hardware/sinclair_spectrum_intrfc1.jpg - title: MICRODRIVES subtitle: '' text: |- Sinclair Microdrives for use with the ZX Interface 1. Up to 8 microdrives can be connected. Micro-tape Capacity: 80k\ Speed: 5k/s\ Average access time: 3,5s\ Integrated power supply (through computer)\ Micro-tape price: 79fr 940fr (June 84) image: /media/museum/hardware/sinclair_spectrum_microdrive.jpg - title: INSIDE A MICRODRIVE subtitle: '' text: |- **(1)** Tape driving roller.\ **(2)** Read/write magnetic head, basically the same as a standard tape recorder.\ **(3)** Read/write protection switch.\ **(4)** Cartridge housing.\ **(5)** Power led.\ **(6)** Extension connector allowing up to 8 microdrives to be serial connected. image: /media/museum/hardware/sinclair_spectrum_insidemdv_1.jpg - title: INSIDE A MICRODRIVE CARTRIDGE subtitle: '' text: The support used in the cartridge is a videotape of 2 mm in width, and 8 meters in length. The video support was chosen for its biggest mechanical resistance. In running mode, the full tape length is covered in about 7 seconds and the information is transferred at 6 Kb. per second (1.5 Kb./sec. for a standard cassette). The recording is made simultaneously on two parallel tracks with a density of 200 bytes per centimeter. The information is organized in sectors of 512 bytes. Any program can be stored or loaded in 15 sec. Maximum. Each cartridge can store up to 100 Kb, but only 85 - 90 are available for the user. image: /media/museum/hardware/sinclair_spectrum_insidecartmdv_1.jpg - title: ZX INTERFACE 2 subtitle: '' text: |- This interface offers 2 joystick plugs and 1 cartridge slot. It cost 351fr in june 84 (France). image: /media/museum/hardware/sinclair_spectrum_intrfc2.jpg - title: CARTRIDGE subtitle: '' text: |- Sinclair Cartridge for use with the ZX Interface 2. Very few cartridges were produced (less than 10). It cost 185fr in june 84 (France). image: /media/museum/hardware/sinclair_spectrum_cartridge.jpg - title: NUMERIC KEYPAD subtitle: '' text: |- This numenic keypad can be used with the Spectrum +2 and Spectrum 128. Thanks to **www.zonadepruebas.com** image: /media/museum/hardware/sinclair_spectrum128_keypad_2.jpg screenshots: - title: ALIEN 8 subtitle: '' text: Excellent isometric game image: /media/museum/software/alien8.gif - title: ANT ATTACK subtitle: '' text: Avoid the giant ants and save the girl in this 3D maze image: /media/museum/software/antattack.gif - title: ARC OF YESOD subtitle: '' text: '' image: /media/museum/software/arcofyesod.gif - title: ATIC ATAC subtitle: '' text: '' image: /media/museum/software/aticatac.gif - title: BACK TO SKOOL subtitle: Skooldaze ? text: '' image: /media/museum/software/backtoskool.gif - title: BOMBJACK subtitle: '' text: Classic game ! image: /media/museum/software/bombjack.gif - title: BRUCE LEE subtitle: '' text: One of the best game ever image: /media/museum/software/brucelee.gif - title: CHASE HQ subtitle: '' text: '' image: /media/museum/software/chasehq.gif - title: CHUCKIE EGG subtitle: '' text: Who never played this ?? image: /media/museum/software/chuckie-egg.gif - title: COMMANDO subtitle: '' text: Excellent conversion image: /media/museum/software/commando.gif - title: DAILEY'S THOMPSON DECATHLON subtitle: '' text: The best olympic game on the Speccy image: /media/museum/software/dailey-thompson-decathlon.gif - title: DAN DARE III subtitle: '' text: '' image: /media/museum/software/dandare3.gif - title: DOUBLE DRAGON subtitle: '' text: A bit messy... image: /media/museum/software/doubledragon.gif - title: DUN DARACH subtitle: '' text: The guys are walking so smoothly image: /media/museum/software/dundarch.gif - title: ELITE subtitle: '' text: The mythic space game ! The father of all other space-games such as Wing-Commander. image: /media/museum/software/elite.gif - title: FANTASY WORLD DIZZY subtitle: '' text: One of the many games based on the egg-man Dizzy. image: /media/museum/software/fantasy-world-dizzy.gif - title: GAUNTLET subtitle: '' text: Conversion of the classic arcade game image: /media/museum/software/gauntlet.gif - title: GUNFRIGHT subtitle: '' text: 3D isometric western game. A must-have ! image: /media/museum/software/gunfright.gif - title: IKARI WARRIORS subtitle: '' text: As good as Commando ! image: /media/museum/software/ikari-warriors.gif - title: IK+ subtitle: International Karate + text: 3 players fight image: /media/museum/software/ikplus.gif emulators: - title: EightyOne url: http://www.chuntey.com/eightyone/ platform: Windows text: Excellent emulator emulating nearly all ZX computers (80, 81, Spectrums, Timex, etc.). As well as emulating the machines themselves, numerous addon cards are supported, including hi-res graphics, custom character sets, sound and colour cards. - title: GLECK url: HTTP://GLECK.EMUUNLIM.COM platform: Windows text: Spectrum emulator. Runs on Windows 95 and up, and requires DirectX. Includes a debugger, and emulates also some Southamerican clones - title: RealSpectrum url: http://www.ramsoft.bbk.org/realspec.html platform: Windows text: complete and innovative Spectrum emulator for DOS and Windows - title: Spectaculator url: http://WWW.SPECTACULATOR.COM/ platform: Windows text: Spectaculator emulates the 16K/48K/128/+2/+2A Spectrums and some additional hardware. - title: SPIN url: http://www.worldofspectrum.org/emulators.html platform: Windows text: Spectrum emulator running on any version of Windows from '95 onward up to and including XP - title: Warajavo url: http://www.void.jump.org/warajevo/ platform: Windows text: an excellent bosnian emulator for PC compatibles by Zeljko Juric (DOS) - title: X128 url: http://www.void.jump.org/x128/ platform: Windows text: Spectrum 48 / 128 / +2 / +3 Emulator - title: ZX-32 url: http://www.geocities.com/SiliconValley/Bay/9932/ platform: Windows text: Great Win32 Emulator. Very stable, very fast. - title: MacSpectacle url: http://little-bat.de/zxsp/download/mac_spectacle/manual.html platform: Apple text: One of the most powerful Spectrum emulator - title: ZXSP url: http://little-bat.de/zxsp/download/zxsp_mac/zxsp_mac.html platform: Apple text: Emulator for PowerMac - title: Ian's ZX Spectrum page url: http://www.comlab.ox.ac.uk/oucl/users/ian.collier/Spectrum/ platform: Unix / Linux text: the official page of xz80, the emulator for XWindows - title: xzx url: http://www.zx-spectrum.net/xzx/ platform: Unix / Linux text: an other emulator for Linux computers - title: ASp url: http://www.greew.freeserve.co.uk/ASp.html platform: Amiga OS text: '' - title: Spec128 url: http://members.tripod.com/~JoeKelleher/Spec128/ platform: RISC OS text: Emulates a Spectrum 128 for the Acorn - title: HOB Java Spectrum emulator url: http://www.twinbee.org/hob/ platform: Other platform text: Fascinate yourself for hours with this portable Java Spectrum Emulator. - title: Java On-Line Emulator url: http://www.zxspec.freeserve.co.uk/java.html platform: Other platform text: Plays games on-line ! - title: PocketClive url: http://pocketclive.emuunlim.com/ platform: Other platform text: Spectrum 48k and 128k emulator for PocketPC ! - title: QAOP url: http://wizard.ae.krakow.pl/~jb/qaop/ platform: Other platform text: Qaop is a ZX Spectrum emulator Java applet - title: Sinclair Spectrum Emulator 1.1 url: http://www.palmtop.nl/ce/hpc_spectrum.html platform: Other platform text: Handheld PCs and Palm-size PCs running Windows CE 2.0 or higher - title: TEZXAS url: http://tezxas.ticalc.org/ platform: Other platform text: ZX Spectrum emulator for TI 89 and 92 calculators ! - title: ZX68 url: http://zx68.8k.com platform: Other platform text: Emulator for various 68000 based machines. First version is released for PalmOS - title: FUSE url: http://fuse-emulator.sourceforge.net/ platform: Multiplatform text: Fuse (the Free Unix Spectrum Emulator) is a ZX Spectrum emulator for Unix and MacOS X - title: SPEC url: http://WWW.METHEDRINE.DEMON.CO.UK/spec.html platform: Multiplatform text: Spec is a Sinclair ZX Spectrum 48k emulator for the PC. There are two different versions, Spec (freeware for DOS) and SpecX (Shareware for Windows 95/98/NT4). links: - title: CRASH, the on-line edition url: http://www.crashonline.org.uk/ text: Site dedicated to the old well-known magazine - title: DOCUMENTATION url: http://www.madhippy.com/8-bit/index.php?machine=sinclair text: Classic 8-bit Computers / lot of on-line documentations for Sinclair computers. USEFUL ! - title: DOCUMENTATION url: http://www.worldofspectrum.org/documentation.html#manuals text: World of Spectrum's documentation page - title: Good Old Games url: http://speccy.altervista.org/ text: ZX games and screenshots - title: Las Spectrum y TK en el Uruguay url: http://WWW.Z80.UY.TC text: The story of the ZX Spectrum line and TK line in Uruguay, South America - title: Number Cruncher url: http://www.8bit-museum.de/ text: This german website has an excellent Sinclair section - title: Planet Sinclair url: http://www.nvg.ntnu.no/sinclair/ text: THE site to visit ! Everything you need. - title: Sinclair Nostalgia Products url: http://surf.to/zx text: Lot of speccy stuff here and long list of clones - title: Sinclair ZX Hardware Website url: http://www.xs4all.nl/~echorod/zx/index.htm text: Features designs to build your own Sinclair computer - title: Software Records on Vinyl url: 'http://www.kempa.com/blog/archives/000053.html ' text: These records contained computer programs as part of the audio. - title: Speccy.com.ar url: http://www.speccy.com.ar/ text: Argentine blog dedicated to the Spectrum - title: Speccyalista url: HTTP://WWW.SINCLAIR.HU text: Hungarian Sinclair page - title: Spectrum Screenshot Heaven url: http://members.tripod.com/ssh_web/ text: Excellent ! Plenty of speccy screenshots here. - title: Speecy.CZ url: http://www.speccy.cz/ text: Nice site with a lot of games, demos, maps, screenshots, cover arts, music, etc... - title: Steve's Spectrum Page url: http://ireland.iol.ie/~sjones/ text: Steve collects speccy games and accept requests - title: Tape Loader Home Page url: http://perso.club-internet.fr/jgibart/spectl/spectl.html text: Utility to transfer your zx tapes to the PC - title: The Incomplete Spectrum ROM Assembly url: http://www.wearmouth.demon.co.uk/ text: Spectrum ROM assembly text file. Very useful if you want to create your version of the Spectrum Operating System - title: The Ocean Experience url: http://www.theoceanexperience.cjb.net/ text: A look into one of the biggest games developers of the 80's and 90's - title: The Tipshop url: http://www.the-tipshop.co.uk/ text: A central archive for all Spectrum and SAM games hints, tips, cheats, maps, hacks and pokes. Impressive! - title: The World of ZX-Spectrum url: http://www.worldofspectrum.org/ text: This is it. The site you MUST visit first :-) - title: Virtual TR-DOS url: HTTP://ZX.DA.RU text: Belarussian ZX-soft archive (in Russian) - title: Your Sinclair, a celebration url: http://www.yoursinclair.co.uk/ text: Tribute to one of the best Spectrum dedicated magazine - title: z00m's Speccy corner url: http://zoom.czweb.org/ text: DOCUMENTATION, PICTURES, emulators, AY CHIP - title: ZX Download page url: http://zxfiles.hut2.ru/ text: The very best of new ZX Spectrum games both Europe and ex-USSR - title: ZX Forever url: http://www.zx-f.ru/ text: Full with new Russian ZX Spectrum games (lots of them are in English language) - title: ZX Spectrum Games after 1993 url: http://tarjan.uw.hu/zx_gamez_after_93_en.htm text: Nice article referencing ZX Spectrum games released after 1993! - title: ZX Spectrum in the 21st Century url: http://tarjan.uw.hu/zxclones_en.htm text: Nice info about a lot of ZX Spectrum clones and hardware - title: ZXSPECTICLE url: http://www.worldofspectrum.org/zxspecticle/ text: News, Reviews, Interviews and the A to Z top ten games - title: Web Wiz CAPTCHA url: http://www.webwizcaptcha.com text: Sinclair computers docs: - title: ZX SPECTRUM BASIC PROGRAMMING url: http://www.1000bit.it/support/manuali/sinclair/zxspectrum/start.htm cover: /media/museum/docs/couvs/sinclair_zx-specrtum_basic-programming.jpg text: |- [**ZX SPECTRUM BASIC PROGRAMMING**](http://www.1000bit.it/support/manuali/sinclair/zxspectrum/start.htm)written by Steven Vickers  compiled/archived by Chris Owen / Tiziano Garuti\  type of document : HTML\  source : [1000Bit](http://www.1000bit.net/) - title: ZX SPECTRUM INTRODUCTORY MANUAL url: http://www.worldofspectrum.org/ZXSpectrumIntroduction/ cover: /media/museum/docs/couvs/sinclair_zx_spectrum_introductory-manual.jpg text: |- [**ZX SPECTRUM INTRODUCTORY MANUAL**](http://www.worldofspectrum.org/ZXSpectrumIntroduction/)written by Steven Vickers and Robin Bradbeer  compiled/archived by Colin Woodcock\  type of document : HTML\  source : [www.worldofspectrum.org](http://www.worldofspectrum.org/faq/resources/documents.htm) - title: ZX SPECTRUM SERVICE MANUAL url: http://members.lycos.co.uk/eightbitula/48kinfo.html cover: /media/museum/docs/couvs/sinclair_zx-specrtum_service-manual.jpg text: |- [**ZX SPECTRUM SERVICE MANUAL**](http://members.lycos.co.uk/eightbitula/48kinfo.html)written by Sinclair Research Limited  type of document : HTML\  source : [The Lil Old Sinclair Computer Technical Information Repository](http://members.lycos.co.uk/eightbitula/) comments: - author: Marcin Kazmierczak (Poland) date: Friday 16th December 2016 text: Please visit my website dedicated to Elwro 800 Junior only. I have the biggest collection of Elwro 800 Junior. - author: Marcin Ka$$378$mierczak (Poland) date: Friday 16th December 2016 text: Please visit my website dedicated to Elwro 800 Junior only. I have the biggest collection of Elwro 800 Junior. - author: Szymon (UK) date: Friday 6th May 2016 text: Just got myself one of these however, it seems like the 804 prototype looks somewhat similar to Olivertti Prodest, with the way they mounted the floppy drive :) - author: Marek (Netherlands) date: Friday 29th April 2016 text: |- The funny thing is - they didn''t create a special encasing, but just utilised one from the electronic organ: Elwirka\ http://legendy-prl.pl/elwirka-1.jpg - author: Roma (St Petersburg) date: Friday 13rd September 2013 text: |- Hello, help me please to find som information about\ M-241/EC 8013.01\ NORTHERN TELECOM ELWRO\ http://cs540108.vk.me/c540100/v540100349/438b/YAKZGBFK_yE.jpg - author: Marek (Poland) date: Wednesday 21st September 2011 text: |- First, Elwro 804 was not similar to C128 at all, it was more similar to Didaktik Kompakt or Commodore 65/64DX (outside only). Now about 800. After sending to school, there were many problems with these computers. Some units were damaged, some even not assembled!. You opened a box, and - Voila! Case, mainboard, power supply and screws, separately. Do it yourself :D.\ Someone from Elwro finally explained how manufacturing tests of mainboard look like: They put a program in and leave it running for a night. If it hanged, let''s try one more time :).\ But the biggest pain in @ss was a floppy drive. They used poor quality hungarian drives, which were destroying system disks! Finally Elwro decided to replace every floppy drive with Teac or Robotron device.\ These hungarian drives not only destroyed system disks, but ruined network drivers. Drivers were loaded wrong way, giving unexpected results. My IT teacher remembers a situation, in which grabbing a screen from student''s computer resulted in hanging student''s Junior \~1 minute after teacher''s look, and after two minutes, causing network fatal error on teacher''s unit, freezing OS and entire network. The only way out: Reset everything in network. The PC described by Maciek is probably Mazovia or Elwro 801/AT.\ One more thing: When Elwro used all floppy drive cases from warehouse, they started to put these in Elwro 801/AT case, more than two times bigger than drives and their PSU. - author: Tomasz (Warszawa) date: Monday 11th October 2004 text: |- I found some more technical specifications on Elwro 800 at: http://www.8-bit.interbit.com.pl/index.php?id_komp=50&fotka=elwro_800jr_04 If someone needs a translation from polish, I can do it in the next weekend (right now I suffer from a lack of time). Bye! - author: Tomas (Swinoujscie, Poland) date: Thursday 2nd October 2003 text: |- I used to play with theese Elwro 800 when i was in high school about 15 years ago. It really worked and CP/M and the network (DIN-5 cables in a daisy-chain) worked marvelous. Comparing to the PC/XT that i had, it worked really nice and the games stored on 5.25'' floppies loaded in a few seconds contrary to the old ZX Spectrum tapes.\ My informatics teacher MR. Stefan Sroka was a great fan of theese computers, especially LOGO which was his favorite programming language. related: - /museum/czerweny-cz-2000 - /museum/czerweny-spectrum - /museum/czerweny-spectrum-plus - /museum/sinclair-zx-spectrum - /museum/sinclair-zx-spectrum-128 - /museum/sinclair-zx-spectrum-2 - /museum/sinclair-zx-spectrum-3 - /museum/sinclair-zx-spectrum-480 oc_id: 951 source: url: https://web.archive.org/web/20230208074220/http://www.old-computers.com/museum/computer.asp?c=951 date: '2023-02-08' --- The Elwro 800 series was designed in 1985 by people from the **Automatics Institute of Technical University** in Poznan, following the request of Polish Ministry of Education. The final product had to be:\ • Cheap,\ • ZX Spectrum compatible,\ • Appropriate for school use. The computer went into production in 1986 in **Elwro Electronic** Factory of Wroclaw, Poland. It was fully [Spectrum](/museum/sinclair-zx-spectrum/) compatible. Designers also added network capability to access the shared printers and floppy drives. The operating system was **CP/J**, a modified version of CP/M allowing networks called **Junet** to be managed. The 800 Junior could could work under the CP/M 2.2. The funny thing is the computer case was taken from a toy piano. The wire on the top of the case was used initially as a music stand... Planned production volume for 1986 was 500 pieces. Elwro 800 Junior was released in three different versions:\ **Elwro 800**, the "student" version had no disk controller,\ **Elwro 800-2**, the "teacher" version had a disk controller,\ **Elwro 800-3** was a off-line version students or teachers could use. In 1990, a **Junior 804** prototype was built. It had a built-in 3.5" floppy disc drive and looked like a [Commodore 128](/museum/commodore-c128-c128d/). Elwro factory closed its doors in late eighties. Assets were sold to Siemens. Thanks to **Pawel Kubacki** from Poland for information and pictures. --- **Maciek Goralski** adds:\ There was some kind of XT PC made by elwro - it was elwro own design and it could be used with Junet network - in my primary school we were using one Elwro PC with 8, maybe 10 Elwro's 800-3 Junior and 2 east german floppy disc drives - it was fantastic computer :)