Greetings I know this is an old thread but I have a lead for the search for the NTSC version of the Sinclair QL. For some reason my family did own one all I can say is that I have the official user's manual for it in my possession and the machine itself was lost in my grandfather's house. Unfortunately my grandfather is a hoarder so there are only two ways to retrieve my NTSC Sinclair QL and that's either wait until it is stumbled acrossed by my grandfather or to go dumpster diving for a few days with a breath mask and gloves and hope for the best. Hopefully it can be found soon and I can post an update on either this discussion thread or someplace else on the internet.