On May 13, 2004, at 4:07 PM, Mike McMullen wrote: > If anything DOS has it's roots in CP/M. Ahhh, those were the days! > Back in the days of using PIP, which probably had it's roots in > RSX or RSTS. one of many histories of DOS : http://www.maxframe.com/HISZMSD.HTM seem to be pretty much how I remember it.