yann64andClaude Opus 5.5
b274874139
1,289 discussions, 9,527 archived comments; pages no longer carry the comments themselves. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ
143 lines
5.0 KiB
Markdown
143 lines
5.0 KiB
Markdown
---
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title: ELECTROMAGNETICA Jet
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categories:
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- Computers
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types:
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- Home Computer
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origins:
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- Romania
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years:
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- '1990'
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cpus:
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- MME 880D Zilog Z80 Russian clone
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params:
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name: Jet
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image: /media/museum/photos/jet_system_1.jpg
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company: /companies/electromagnetica
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company_name: ELECTROMAGNETICA
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specs:
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- label: NAME
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value: Jet
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- label: MANUFACTURER
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value: Electromagnetica
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- label: TYPE
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value: Home Computer
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- label: ORIGIN
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value: Romania
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- label: YEAR
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value: ? 1990
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- label: BUILT IN LANGUAGE
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value: Sinclair Basic
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- label: KEYBOARD
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value: QWERTY mechanical 40 keys
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- label: CPU
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value: MME 880D Zilog Z80 Russian clone
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- label: SPEED
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value: 3.5 MHz
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- label: RAM
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value: 48 KB + 16 KB masked by the ROM
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- label: ROM
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value: 16 KB (Basic + O.S.) + 4 KB (Unknown)
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- label: TEXT MODES
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value: 32 x 24
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- label: GRAPHIC MODES
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value: 256 x 192
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- label: COLORS
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value: 8 with two tones each (normal and bright)
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- label: SOUND
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value: 1 voice / 10 octaves (Beeper)
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- label: SIZE / WEIGHT
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value: 358 x 238 x 80 mm / 3 Kg max.
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- label: I/O PORTS
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value: RF video out, RGB out, expansion port (not connected), tape-recorder (In, Out, Rem), external loudspeaker
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- label: POWER SUPPLY
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value: 'Built-in power supply, 220 Vca + 10%, - 15%, 50 Hz +/- 1 Hz, Max power: 15 W'
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- label: PRICE
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value: 11.500 lei (Romania, 1990)
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tabs:
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- photos
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forum_thread: 653
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photos:
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- title: JET (YELLOW MODEL)
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subtitle: ''
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text: |-
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Need a phone? You got a computer!
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Thanks to Zeno Mateescu for this picture
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image: /media/museum/photos/electromagnetica_jet-yellow_1.jpg
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- title: TOP VIEW
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subtitle: ''
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text: Thanks to Zeno Mateescu for this picture
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image: /media/museum/photos/electromagnetica_jet-yellow_2.jpg
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- title: KEYBOARD CLOSE-UP
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subtitle: ''
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text: The keyboard was of poor quality. Each key was made of a colour printed piece of paper inserted in a key-cap.
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image: /media/museum/photos/jet_keyboard_1.jpg
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- title: 'INSIDE #1'
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subtitle: ''
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text: |-
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Only one of the two system boards is pictured here.
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**(1)** Mains supply fuse\
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**(2)** Power transformer\
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**(3)** Voltage regulation circuit\
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**(4)** TV-RF modulator\
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**(5)** Reset switch\
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**(6)** Joystick connector\
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**(7)** RGB connector\
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**(8)** Basic interpreter and O.S. ROM chips (2 KB each)\
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**(9)** MME 880D processor. Zilog Z80 Russian clone\
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**(10)** Keyboard cable
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image: /media/museum/photos/jet_inside_1.jpg
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- title: 'INSIDE #2'
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subtitle: ''
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text: 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.
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image: /media/museum/photos/jet_inside_3.jpg
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- title: MAINBOARD CLOSE-UP
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subtitle: ''
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text: Processor, ROM chips and daughterboard connector.
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image: /media/museum/photos/jet_inside_2.jpg
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- title: REAR
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subtitle: ''
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text: |-
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from left to right:
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\- home-made joystick connector (direct connections to the keyboard cursor keys: 5,6,7,8 and 0)\
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\- RF video output connector to TV\
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\- External monitor connection?\
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\- Tape recorder -> output for program saving\
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\- Tape recorder -> input for program loading
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Thanks to Zeno Mateescu for this picture
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image: /media/museum/photos/electromagnetica_jet-yellow_rear.jpg
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oc_id: 669
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source:
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url: https://web.archive.org/web/20230608213821/http://www.old-computers.com/museum/computer.asp?c=669
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date: '2023-06-08'
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---
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We have few information about this computer.
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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.
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The keyboard was made of printed pieces of paper inserted in transparent key-caps.
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This system has been deeply modified by the user(s).
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**Zeno Mateescu**, who owned a JET, reports:
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The whole computer was more a [HC-85](/museum/ice-felix-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.
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Output signals:\
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\- pal video signal: PAL: 1 Vvv / 75 ohm;\
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\- radio signal: 1 mVeff / 75 ohm;\
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\- the signal for the cassete recorder: 05 Vvv / 1 Kohm\
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Input signal from the cassete recorder: min 50 mVeff\
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Internal beeper: min. 55 dB SPL
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---
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**Contributors:** Costel Dumitru
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<table> <tr> <td></td> <td>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.</td> <td></td> </tr> </table>
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