You have to socket your CPU or solder a socket on top of the CPU and you have to solder +5V, +12V and GND to the VOFA Adapter. If your ET4000 card need -12V you have to solder this as well. The -12V Line you can find on the Mainboard in the serial circuit.
what is the reference of the cables you use for extension from the adapter to the vga card ? I embedded the VGA card inside my Mega STe but sometimes the card won't be recognized, I guess it's because the cable are a bit too small in length and the cables are too tight. I would like to order longer cables to get rid of this problem but I don't know which one and were to find them