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It is most likely 50Hz because that is the PAL standard so it is not that but I will stop for now. I think it is stupid to play with the FDX if I don't chance those RIFA generators anyways.

I have a OSSC but I don't think can help because it only takes a RGB scart :/

Yes the disk drive LED comes on. Picture in LCD just goes up and down. Is the signal from that RCA maybe 15khz and this LCD does not take that.
I now used only the FDX PSU to power both FDX and MTX.

I opened the FDX and even thou I did not take the PSU out I could see that all the components looked like this was built yesterday. So I power it up and it seems to be working but I cannot get picture. I have a old small LCD TV which has a VGA, RCA and I tried to connect the FDX in that via RCA but ...

Thanks for the advice. It has not been probably ever been used. Maybe I open the FDX cover and also the PSU before I turn it up to see if there is any leaked capacitors.

I had some time to test the system. MTX works! Next week I will try to test the FDX system. I hooked MTX via RF cable. There is also a monitor port so if I put a coaxcial rca adapter there and then I can use a RCA cable? Here is all my cassettes. I also have couple floppy disk with Supercalc, Memote...

That is probably right. Still 223 disk system seems a really low number but I don't think there were much more MTX computers in Finland also. I had never heard of MTX but also it was before my time. I think MSX especially Spectravideo was popular in Finland back then and obviously C64.

Hi, new MTX owner. I just found a pretty much NOS MTX 512 and FDX :) will test it in this weekend :) I did check before I bought it the RMC - THe Cave youtube video and MTX seems a cool machine. The games are pretty good and sound is not bad. Also with FDX you can use CP/M which is nice. I always wa...