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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> extropy-chat-bounces@lists.extropy.org [mailto:extropy-chat-bounces@lists.extropy.org] <b>On Behalf Of </b>Giovanni Santostasi<br><b>Sent:</b> Monday, November 19, 2012 11:06 AM<br><b>To:</b> ExI chat list<br><b>Subject:</b> Re: [ExI] Why space tech isn't cutting edge<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Did actually people do tests with modern chips in space? Or just one earth using very high energy sources?<o:p></o:p></p><div><p class=MsoNormal>None of the astronauts bring with them their ipads?<o:p></o:p></p></div><div><p class=MsoNormal>Or is it that the use of the 486 is based on making sure the vital system are overbuild for safety? <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>When we sent payloads with my students to the stratosphere using balloons, we found out quickly that is not a good idea to send hard drives with disks that use air as cuscion (for obvious reasons) that were not obvious to us when we tried the first time. <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>But we had no problems with solid state drives. But we were in the stratosphere with still some protection from the atmosphere. How powerful of a cosmic ray you need to get before failure? Is it permanent? What is the probability of failure? <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Giovanni<o:p></o:p></p></div><div><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Giovanni, many questions here, short answer: modern electronics will work to some extent in space. The problem is that you cannot operate those electronics in such a way that your mission hangs on them working reliably. Usually single event upsets can be reset with something analogous to a reboot: just interrupt power and let it come back up using firmware. Problem is, modern electronics like laptop computers don’t rely much on firmware. Laptop computers have been taken into space, and they work, but cannot be used for control algorithms.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>spike<o:p></o:p></span></p></div></div></body></html>