Hi!
Finally, after a long hiatus because of work and family (we had a baby girl

), i could fix my computer, i found another four set of memory ic, 44c256 on an old pc-board, now with the same layout and soldering (the pins of the memory ics are ok in the diagram i used) it works and i finally have a 512k msx2+
Thanks every one for your help!
Now to find a good use for those extra 256ks, any suggestions?
HtDreams