Thank you to ntp, Topcat and P-Henny for their suggestions. These extended cables will be a link from my points PCB boards to my points control panel, so will the same concerns regarding resistance still be an issue. It looks like I will have to buy some thicker wire 16/.02 wire and make up my own two parallel cables with some DB25 sockets and plugs. I think doing the calculations regarding resistance is a bit outside my comfort zone, so I will play safe. Thank you.