On Thu, 12 Nov 2009 12:05:37 -0800 (PST), Mark Brueggemann wrote: ><http://spectrum.ieee.org/computing/hardware/rebuilding-the-ibm-1401/> Would this have used magnetic core memory like a Univac? What would the actual OS have been? If Bob Wonderly sees this - did you ever work with one of these? Brian Grawburg