tag:blogger.com,1999:blog-8869371566442567811.post8281533405085327350..comments2024-03-27T23:23:05.548-07:00Comments on Rescue 1130: 2014 Pickup of an IBM 1130 System and More: Dumping the cpu test diagnostic from simulator and loading on the real 1130Carl Claunchhttp://www.blogger.com/profile/00359841432891565909noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-8869371566442567811.post-64926395713934156132022-06-18T13:55:51.499-07:002022-06-18T13:55:51.499-07:00Hi David. The machine that had the issues with cor...Hi David. The machine that had the issues with core memory was the 1620 (and 1710, its process control twin). Something used with those memory stacks turned a bright green with age and ate away the wire at the solder point.<br /><br />Essentially every 1620 on the planet has this corrosion issue. <br /><br />Not so the 1130, its process control twin the 1800, nor the 360 models that used similar core modules. This was a process or materials choice that IBM made for San Jose based core memory in the late 1950s that was not carried over to the early 1960s and later stacks.<br /><br />This particular machine was from Canada, then stored in a museum in Baltimore, then stored in my air conditioned workshop, thus safe from humidity had that been an issue. <br /><br />I do see signs of rust and corrosion on some exposed metal but it didn't seem to affect any of the circuitry or components. Carl Claunchhttps://www.blogger.com/profile/00359841432891565909noreply@blogger.comtag:blogger.com,1999:blog-8869371566442567811.post-35571214195238465032022-06-18T07:38:59.649-07:002022-06-18T07:38:59.649-07:00Carl, I was talking to another ex-IBMer about this...Carl, I was talking to another ex-IBMer about this project and he thought he recalled that 1130s had a history of rust affecting the core memory. Obviously rusting cores would be very bad, but is that a concern in your experience? (Especially in the Florida climate?)David Cortesihttps://www.blogger.com/profile/06760661115101469280noreply@blogger.com