hi Jay, Thanks for the advice. I need a little help with this. I downloaded the file you suggested to build the cable to connect my PC to the C40K but I couldn't figure out how to build it correctly. The C40K has 3 "doors" in the front, each one with one socket or connector, and I don't know in which one I must connect my serial cable from the PC. The "door" in the left has the socket base for the ROM-H. The "door" a little low in the center has a 48 holes female connector. And the "door" in the right has a 26 pins male connector. I assume I should use one of the two connectors but I don't know which one. Please be so kind to tell which one I should use to connect the cable and which are the numbers of each pin or hole in that connector to make the proper connections. Once again, thanks in advance for your support. Gonzalo Delgadillo