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E > ELECTROMAGNETICA > Jet   


ELECTROMAGNETICA
Jet

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


_________

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.

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http://www.ebay.com/itm/301586894057?ssPageName$STRK:MESELX:IT$_trksid$p3984.m1555.l2649

          
Wednesday 15th April 2015
ANDREI (romania)

Indeed it was slow, I think due to a 2.5 Mhz CPU instead of the standard 3.5 Mhz for HC-85. I owned one and was driving me mad for not being able to load the "nonstandard" games. How can I define them? When loading BASIC programs, the screen flickers in a specific way - it loaded such programs. More recent games however, used their own loading routine, which flicked the screen "differently". They were probably heavier on the CPU, ''coze they didn''t load on JET.

Finally I gave up, sold it, added some difference and bought a HC. What a difference!

          
Saturday 8th September 2012
RHX

I own one of these and I can say I$m very nostalgic when thinking of it, but it was rubbish. It$s processing speed was the slowest of them all (HC / TIM-S / CIP) and I know the technical specification of mine said 250 000 hz Cpu speed. At 4Mhz I had a PC286.. I think the specs displayed here are a little optimistic.

          
Monday 5th September 2011
Robert Teodorescu (Romania)

 

NAME  Jet
MANUFACTURER  Electromagnetica
TYPE  Home Computer
ORIGIN  Romania
YEAR  ? 1990
BUILT IN LANGUAGE  Sinclair Basic
KEYBOARD  QWERTY mechanical 40 keys
CPU  MME 880D Zilog Z80 Russian clone
SPEED  3.5 MHz
RAM  48 KB + 16 KB masked by the ROM
ROM  16 KB (Basic + O.S.) + 4 KB (Unknown)
TEXT MODES  32 x 24
GRAPHIC MODES  256 x 192
COLORS  8 with two tones each (normal and bright)
SOUND  1 voice / 10 octaves (Beeper)
SIZE / WEIGHT  358 x 238 x 80 mm / 3 Kg max.
I/O PORTS  RF video out, RGB out, expansion port (not connected), tape-recorder (In, Out, Rem), external loudspeaker
POWER SUPPLY  Built-in power supply, 220 Vca + 10%, - 15%, 50 Hz +/- 1 Hz, Max power: 15 W
PRICE  11.500 lei (Romania, 1990)


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