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E > ELECTROMAGNETICA > Jet


 

This mini forum is intended to provide a simple means of discussion about the Electromagnetica Jet computer. If you want to share your own experience or memories, or add relevant information about this system: post a message!

  Click Here to add a message in the forum

 

Wednesday 16th September 2020
Mihnea (Netherlands)
my digital abode

I started my epic IT journey with one of these, and it will always hold a special place in my heart. I actually still own it, and it still starts up (haven''t tried any programs though as I don''t have the cassette tapes anymore).

Contrary to what some of the comments here state, the processor was perfectly fine and useable, despite being a reverse-engineered clone of the Z80. I played countless games on it (including the ones with custom loading procedures), wrote and ran numerous programs in BASIC and assembler, even loaded a simple version of PASCAL.

It''s possible some of the "JET" clones on the market were actually fakes, as it was common in Romania of that time to take the case of an existing computer and then add or tweak the internals$ that would explain the poor experience some other users have seen. Mine worked perfectly fine for everything I ever threw at it, actually I lately won a HC-90 during a computer programming contest and it was significantly worse in all aspects $ buggy loading from tape (kept R Loading Error''ing), non-working keys, insane noise when loading programs from tape (whoever thought that was a useful thing to have?!).

The keycaps were by far the best on the market among all Z80 Romanian clones (HC, CIP, etc.) as they had the text printed and covered by a plastic cap$ it means they are still readable and in great shape decades later, as opposed to the others which had missing text soon after purchase and later would turn into "blank" keyboards.

The main disadvantage of the machine was the lack of native extensions $ while the HC benefitted from the Interface 1 and 2 add-ons, which enabled joysticks, floppy disk drives and even networking support (!), on the JET that all had to be done "the hard way". Mine only had a Sinclair Joystick extension to the side, which required some soldering and case modding, but it worked nicely afterwards.

Another interesting fact about the JET was that it was capable of reading several different tape "styles" (programmes recorded with different machines were rarely compatible among them due to the speed and amplitude of the tape signals), all it took was slight tweaks to the tape head. The CIP was also pretty good in this regard, but the HC was absolutely terrible, refusing to load any programme not written by its own hardware.


Wednesday 15th April 2015
ANDREI (romania)

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


Saturday 8th September 2012
RHX

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!


Monday 5th September 2011
Robert Teodorescu (Romania)

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.


Friday 16th July 2010
$$350$tefan (Bucharest, Romania)

Dind''t knwow that "Electromagnetica" assambled computers too!


Tuesday 15th July 2008
Costel Dumitru (Romania)

I remember seeing this JET computer on store shelves back in 1990 as a novelty. At 11.500 lei it was expensive (a similar machine, HC-90, had a price of 10.000 lei that year). It was featured as a "TV games machine", but it was a full-fledged Sinclair Spectrum clone.

I did not own one (being too expensive), but I used a TIM-S, a HC-85, a HC-90 and a HC-91.





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