website/content/museum/electromagnetica-jet.md

title, categories, types, origins, years, cpus, params

title	categories	types	origins	years	cpus	params
ELECTROMAGNETICA Jet	Computers	Home Computer	Romania	1990	MME 880D Zilog Z80 Russian clone	name image company company_name specs tabs forum_thread photos oc_id source Jet /media/museum/photos/jet_system_1.jpg /companies/electromagnetica ELECTROMAGNETICA label value NAME Jet label value MANUFACTURER Electromagnetica label value TYPE Home Computer label value ORIGIN Romania label value YEAR ? 1990 label value BUILT IN LANGUAGE Sinclair Basic label value KEYBOARD QWERTY mechanical 40 keys label value CPU MME 880D Zilog Z80 Russian clone label value SPEED 3.5 MHz label value RAM 48 KB + 16 KB masked by the ROM label value ROM 16 KB (Basic + O.S.) + 4 KB (Unknown) label value TEXT MODES 32 x 24 label value GRAPHIC MODES 256 x 192 label value COLORS 8 with two tones each (normal and bright) label value SOUND 1 voice / 10 octaves (Beeper) label value SIZE / WEIGHT 358 x 238 x 80 mm / 3 Kg max. label value I/O PORTS RF video out, RGB out, expansion port (not connected), tape-recorder (In, Out, Rem), external loudspeaker label value POWER SUPPLY Built-in power supply, 220 Vca + 10%, - 15%, 50 Hz +/- 1 Hz, Max power: 15 W label value PRICE 11.500 lei (Romania, 1990) photos 653 title subtitle text image JET (YELLOW MODEL) Need a phone? You got a computer! Thanks to Zeno Mateescu for this picture /media/museum/photos/electromagnetica_jet-yellow_1.jpg title subtitle text image TOP VIEW Thanks to Zeno Mateescu for this picture /media/museum/photos/electromagnetica_jet-yellow_2.jpg title subtitle text image KEYBOARD CLOSE-UP The keyboard was of poor quality. Each key was made of a colour printed piece of paper inserted in a key-cap. /media/museum/photos/jet_keyboard_1.jpg title subtitle text image INSIDE #1 Only one of the two system boards is pictured here. **(1)** Mains supply fuse\ **(2)** Power transformer\ **(3)** Voltage regulation circuit\ **(4)** TV-RF modulator\ **(5)** Reset switch\ **(6)** Joystick connector\ **(7)** RGB connector\ **(8)** Basic interpreter and O.S. ROM chips (2 KB each)\ **(9)** MME 880D processor. Zilog Z80 Russian clone\ **(10)** Keyboard cable /media/museum/photos/jet_inside_1.jpg title subtitle text image INSIDE #2 The second board featuring 8 KB of ROM is connected above the first one. It is difficult to know the use of this board as there is no inscription on top of the main chip. /media/museum/photos/jet_inside_3.jpg title subtitle text image MAINBOARD CLOSE-UP Processor, ROM chips and daughterboard connector. /media/museum/photos/jet_inside_2.jpg title subtitle text image REAR from left to right: - home-made joystick connector (direct connections to the keyboard cursor keys: 5,6,7,8 and 0)\ - RF video output connector to TV\ - External monitor connection?\ - Tape recorder -> output for program saving\ - Tape recorder -> input for program loading Thanks to Zeno Mateescu for this picture /media/museum/photos/electromagnetica_jet-yellow_rear.jpg 669 url date https://web.archive.org/web/20230608213821/http://www.old-computers.com/museum/computer.asp?c=669 2023-06-08

We have few information about this computer.

The Jet was a Romanian Spectrum clone computer built in a telephone case! You can see the handset housing and the numeric keyboard replaced with black plastic masks.

The keyboard was made of printed pieces of paper inserted in transparent key-caps.

This system has been deeply modified by the user(s).

Zeno Mateescu, who owned a JET, reports:

The whole computer was more a HC-85 clone, designed more specificaly for computer games. That's where the name came from: JET-EM Aparat pentru jocuri pe ecran TV - machine for games on TV screen - if I remember well. It is indeed a Sinclair ZX Spectrum compatible computer. It didn't had any joystick connector (kempston or any other joystick) so I had to modify it to use a joystick. Another interesting thing about JET was that you couldn't hear the program that was loading from the tape. On HC85, for example, you could hear that, let's call it noise, when loading the program.

Output signals:
- pal video signal: PAL: 1 Vvv / 75 ohm;
- radio signal: 1 mVeff / 75 ohm;
- the signal for the cassete recorder: 05 Vvv / 1 Kohm
Input signal from the cassete recorder: min 50 mVeff
Internal beeper: min. 55 dB SPL

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Contributors: Costel Dumitru

We need more info about this computer ! If you designed, used, or have more info about this system, please send us pictures or anything you might find useful.