Ok, thank you very much for your response.
Still, I have not managed to make a reading of a save data from any of my cartridges.
I suspect it may be a problem with the power to the Assembly, but I'm not sure.
I am not sure where I should connect the clock line, I have connected line of clock at two potential sites in PH3 /CS and CPU_CLK in PH1, none of the two sites work for me, I have to look at the signal with oscilloscope and checked power from the circuit.
Of course, there is no problem, as I get to do a Dump, I will send it to you.
If you wish, you do not buy anything, I can send you a cartridge that I have, with the MN63F81MPN chip.
I need a little time, to check and find where I have the error.