I have tryed the /p1 argument and it work, so is it a very limited solution or can i stay using this method , or buy something else than the megaflashrom ? (carnivor?)
The NMS8250 has a bug in the audio circuit. You can read about it here. The main thing to do is fix the slot board with 2 capacitors and 2 resistors as described on page 5. I got this info from Omega who is well known for his skills in MSX repair! He mentioned using 22uF capacitors (whilst the document says 10uF). It may not make a lot of difference though.
You have just to replace the 100 ohm resistors R428 and R429 each by one 100 uF/10V capacitor (minus pin to the connector AB). I don't know if this is the best method but it is the easiest.
The issue that remains when you replace R428 and R429 with capacitors is (as far as I understand) that the two slots audio input are interconnected and can short if two cartridges with an audio output are connected. This is why (again to my understanding) Omega recommends modifying the slot board.
I just looked at the diagrams in the service manual and R428 and R429 are unrelated. R429 is placed on the audio amp input of the RF modulator, and R428 on the audio amp input of the SCART. So these capacitors are used for another reason, maybe just to filter out some minor parasites.
It is the modification in Spanish that must be made.
