Hi Jack. I think you have mistyped the error message. I don't want to be pedantic, but unless the files are typed correctly it is impossible to diagnose the fault. I think ASP14DOS SYS should be aspi4.sys, but I'm not sure what CONMS. SYS LINE 15 should be, is it comms.sys or (more likely config.sys. If you don't use capitals it will also make the posting more readable.