Re: [Elecraft] Buggy software OT
Guys, time to end this Ot thread. In the future, please do not wait for me to step in. I can't watch the list continually if you also expect us to ship products to you quickly ;-) Self moderate after an OT thread has gone past 5-10 postings. Eric Elecraft list moderator etc. elecraft.com _..._ On Jan 17, 2015, at 7:32 PM, Guy Olinger K2AV k2av@gmail.com wrote: On Sat, Jan 17, 2015 at 4:40 PM, Dick Dievendorff d...@elecraft.com wrote: Software work helps one with humility... If software developing hasn't already beaten one into mumbling and slurring of words without any assistance from the juice. I remember so many days going home with a splitting headache, literal pain. 73, Guy. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to elist_c...@elecraft.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Buggy software OT
Good quips always sail over at least one person's head. K9ZTV On 1/17/2015 1:09 PM, Lynn W. Taylor, WB6UUT wrote: Totally different. This was not flight software -- and it wasn't all software, either. I'm sure we're over the OT limit, but it's really difficult for those of us who did this for a living to read posts from people who don't know what it takes to actually do. On 1/17/2015 10:54 AM, KENT TRIMBLE wrote: Otherwise known as the strategy perfected by JPL in 1998 for the Mars Climate Orbiter . . . one in English units and the other in metric. K9ZTV __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to k9...@socket.net - No virus found in this message. Checked by AVG - www.avg.com Version: 2015.0.5645 / Virus Database: 4260/8946 - Release Date: 01/17/15 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Buggy software OT
Is that software for a single... or a pair of trotters? Or... is it actually for a surrey? Fringed? So many questions... so few answers.. ;-O Have a great day, --... ...-- Dale - WC7S in Wy __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Buggy software OT
Then, would you be so kind as to enlighten us? 73, BILL W4RK On Jan 17, 2015, at 1:41 PM, Lynn W. Taylor, WB6UUT k...@coldrockshotbrooms.com wrote: Good quip, but it doesn't agree with the findings of the Mars Climate Orbiter Mishap Investigation Board. Facts can be so inconvenient. On 1/17/2015 11:15 AM, KENT TRIMBLE wrote: Good quips always sail over at least one person's head. K9ZTV __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to billge...@embarqmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Buggy software OT
This needs to stop here, but since Kent is saying that I don't understand, I'm going to reply. Once. We were talking about how a hypothetical airliner control system would have two different programs, written by different groups, running parallel, with either program capable of flying the plane. Part of the flight system could crash that the pilots and passengers would not notice. Airplanes in flight have to have controls that work in milliseconds without a glitch. With MRO, we have Lockheed software doing navigation, but not flying the spacecraft. JPL software flew the spacecraft, but did not navigate. If JPL did their own redundant navigation, the error would have been caught. It's not like they didn't have time, there was a week between the calculation and the burn. The facts in the Wikipedia article are correct, it just doesn't describe a system that has any redundancy. I will not comment further on this topic on list. We're way over the limit on off-topic posts. 73 -- Lynn On 1/17/2015 12:30 PM, KENT TRIMBLE wrote: Facts can also be factual. Kent K9ZTV /snip/ /_The primary cause of this discrepancy was that one piece of ground software supplied by _Lockheed Martin http://en.wikipedia.org/wiki/Lockheed_Martin_produced results in a _United States customary unit http://en.wikipedia.org/wiki/United_States_customary_units_(American), contrary to its Software Interface Specification (SIS), while a second system, supplied by _NASA http://en.wikipedia.org/wiki/NASA_, that used those results expected them to be in metric units, in accord with the SIS. _Software that calculated the total impulse produced by thruster firings calculated results in pound-seconds. The trajectory calculation used these results to correct the predicted position of the spacecraft for the effects of thruster firings. This software expected its inputs to be in newton-seconds.^[16] http://en.wikipedia.org/wiki/Mars_Climate_Orbiter#cite_note-Mishap-17 / __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Buggy software OT
The Airbus software won't let the pilot do anything that might break the airplane. The Boeing software doesn't have the same limits. I believe there are accidents attributed to both. For critical systems, there are often two different programs, written by different groups of programmers, either of which can fly the airplane. The assumption is that they'll have different bugs. On 1/17/2015 12:40 AM, Fred Townsend wrote: I think there is a big difference in flight software. In Boeing airplanes the pilot is assisted by software. In Airbuses the pilot is allowed to fly the airplane if the software thinks he/she is qualified. There has been at least one airbus crash blamed on software and several other questionable crashes. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Buggy software OT
Facts can also be factual. Kent K9ZTV /On November 10, 1999, the Mars Climate Orbiter Mishap Investigation Board released a Phase I report, detailing the suspected issues encountered with the loss of the spacecraft. Previously, on September 8, 1999, Trajectory Correction Maneuver-4 was computed and then executed on September 15, 1999. It was intended to place the spacecraft at an optimal position for an orbital insertion maneuver that would bring the spacecraft around Mars at an altitude of 226 kilometers on September 23, 1999. However, during the week between TCM-4 and the orbital insertion maneuver, the navigation team indicated the altitude may be much lower than intended at 150 to 170 kilometers. Twenty-four hours prior to orbital insertion, calculations placed the orbiter at an altitude of 110 kilometers; 80 kilometers is the minimum altitude that Mars Climate Orbiter was thought to be capable of surviving during this maneuver. Post-failure calculations showed that the spacecraft was on a trajectory that would have taken the orbiter within 57 kilometers of the surface, where the spacecraft likely disintegrated because of atmospheric stresses. / /_The primary cause of this discrepancy was that one piece of ground software supplied by _Lockheed Martin http://en.wikipedia.org/wiki/Lockheed_Martin_produced results in a _United States customary unit http://en.wikipedia.org/wiki/United_States_customary_units_(American), contrary to its Software Interface Specification (SIS), while a second system, supplied by _NASA http://en.wikipedia.org/wiki/NASA_, that used those results expected them to be in metric units, in accord with the SIS. _Software that calculated the total impulse produced by thruster firings calculated results in pound-seconds. The trajectory calculation used these results to correct the predicted position of the spacecraft for the effects of thruster firings. This software expected its inputs to be in newton-seconds.^[16] http://en.wikipedia.org/wiki/Mars_Climate_Orbiter#cite_note-Mishap-17 / // /The discrepancy between calculated and measured position, resulting in the discrepancy between desired and actual orbit insertion altitude, had been noticed earlier by at least two navigators, whose concerns were dismissed. A meeting of trajectory software engineers, trajectory software operators (navigators), propulsion engineers, and managers, was convened to consider the possibility of executing Trajectory Correction Maneuver-5, which was in the schedule. Attendees of the meeting recall an agreement to conduct TCM-5, but it was ultimately not done./ On 1/17/2015 1:41 PM, Lynn W. Taylor, WB6UUT wrote: Good quip, but it doesn't agree with the findings of the Mars Climate Orbiter Mishap Investigation Board. Facts can be so inconvenient. On 1/17/2015 11:15 AM, KENT TRIMBLE wrote: Good quips always sail over at least one person's head. K9ZTV __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to k9...@socket.net - No virus found in this message. Checked by AVG - www.avg.com Version: 2015.0.5645 / Virus Database: 4260/8946 - Release Date: 01/17/15 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Buggy software OT
I remember some of the history of IBM's smallest program: http://en.m.wikipedia.org/wiki/IEFBR14 In addition to the changes my friend John Pershing mentions, I recall bug reports due to inadequate comments, and because the number of changes per line of code was high, IEFBR14 was high on a list of modules that needed a rewrite... Software work helps one with humility... 73 de Dick, K6KR On Jan 17, 2015, at 14:30, KENT TRIMBLE k9...@socket.net wrote: Facts can also be factual. Kent K9ZTV /On November 10, 1999, the Mars Climate Orbiter Mishap Investigation Board released a Phase I report, detailing the suspected issues encountered with the loss of the spacecraft. Previously, on September 8, 1999, Trajectory Correction Maneuver-4 was computed and then executed on September 15, 1999. It was intended to place the spacecraft at an optimal position for an orbital insertion maneuver that would bring the spacecraft around Mars at an altitude of 226 kilometers on September 23, 1999. However, during the week between TCM-4 and the orbital insertion maneuver, the navigation team indicated the altitude may be much lower than intended at 150 to 170 kilometers. Twenty-four hours prior to orbital insertion, calculations placed the orbiter at an altitude of 110 kilometers; 80 kilometers is the minimum altitude that Mars Climate Orbiter was thought to be capable of surviving during this maneuver. Post-failure calculations showed that the spacecraft was on a trajectory that w ould have taken the orbiter within 57 kilometers of the surface, where the spacecraft likely disintegrated because of atmospheric stresses. / /_The primary cause of this discrepancy was that one piece of ground software supplied by _Lockheed Martin http://en.wikipedia.org/wiki/Lockheed_Martin_produced results in a _United States customary unit http://en.wikipedia.org/wiki/United_States_customary_units_(American), contrary to its Software Interface Specification (SIS), while a second system, supplied by _NASA http://en.wikipedia.org/wiki/NASA_, that used those results expected them to be in metric units, in accord with the SIS. _Software that calculated the total impulse produced by thruster firings calculated results in pound-seconds. The trajectory calculation used these results to correct the predicted position of the spacecraft for the effects of thruster firings. This software expected its inputs to be in newton-seconds.^[16] http://en.wikipedia.org/wiki/Mars_Climate_Orbiter#cite_note-Mishap-17 / // /The discrepancy between calculated and measured position, resulting in the discrepancy between desired and actual orbit insertion altitude, had been noticed earlier by at least two navigators, whose concerns were dismissed. A meeting of trajectory software engineers, trajectory software operators (navigators), propulsion engineers, and managers, was convened to consider the possibility of executing Trajectory Correction Maneuver-5, which was in the schedule. Attendees of the meeting recall an agreement to conduct TCM-5, but it was ultimately not done./ On 1/17/2015 1:41 PM, Lynn W. Taylor, WB6UUT wrote: Good quip, but it doesn't agree with the findings of the Mars Climate Orbiter Mishap Investigation Board. Facts can be so inconvenient. On 1/17/2015 11:15 AM, KENT TRIMBLE wrote: Good quips always sail over at least one person's head. K9ZTV __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to k9...@socket.net - No virus found in this message. Checked by AVG - www.avg.com Version: 2015.0.5645 / Virus Database: 4260/8946 - Release Date: 01/17/15 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to d...@elecraft.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Buggy software OT
Otherwise known as the strategy perfected by JPL in 1998 for the Mars Climate Orbiter . . . one in English units and the other in metric. K9ZTV On 1/17/2015 12:13 PM, someone wrote: For critical systems, there are often two different programs, written by different groups of programmers, either of which can fly the airplane. The assumption is that they'll have different bugs. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Buggy software OT
Totally different. This was not flight software -- and it wasn't all software, either. I'm sure we're over the OT limit, but it's really difficult for those of us who did this for a living to read posts from people who don't know what it takes to actually do. On 1/17/2015 10:54 AM, KENT TRIMBLE wrote: Otherwise known as the strategy perfected by JPL in 1998 for the Mars Climate Orbiter . . . one in English units and the other in metric. K9ZTV __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Buggy software OT
This is getting pretty far off topic, even for someone who has been writing software for 30 years. See you on the 66 foot band. A private response might be a good idea. Or hey, a sked! wunder K6WRU CM87wj http://observer.wunderwood.org/ On Jan 17, 2015, at 12:18 PM, Bill Gerth billge...@embarqmail.com wrote: Then, would you be so kind as to enlighten us? 73, BILL W4RK On Jan 17, 2015, at 1:41 PM, Lynn W. Taylor, WB6UUT k...@coldrockshotbrooms.com wrote: Good quip, but it doesn't agree with the findings of the Mars Climate Orbiter Mishap Investigation Board. Facts can be so inconvenient. On 1/17/2015 11:15 AM, KENT TRIMBLE wrote: Good quips always sail over at least one person's head. K9ZTV __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to billge...@embarqmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to wun...@wunderwood.org __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Buggy software OT
Used to think it was reading comprehension, but K9FD/KH6 Good quips always sail over at least one person's head. K9ZTV On 1/17/2015 1:09 PM, Lynn W. Taylor, WB6UUT wrote: Totally different. This was not flight software -- and it wasn't all software, either. I'm sure we're over the OT limit, but it's really difficult for those of us who did this for a living to read posts from people who don't know what it takes to actually do. On 1/17/2015 10:54 AM, KENT TRIMBLE wrote: Otherwise known as the strategy perfected by JPL in 1998 for the Mars Climate Orbiter . . . one in English units and the other in metric. K9ZTV __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to k9...@socket.net - No virus found in this message. Checked by AVG - www.avg.com Version: 2015.0.5645 / Virus Database: 4260/8946 - Release Date: 01/17/15 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to k...@flex.com . __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Buggy software OT
Good quip, but it doesn't agree with the findings of the Mars Climate Orbiter Mishap Investigation Board. Facts can be so inconvenient. On 1/17/2015 11:15 AM, KENT TRIMBLE wrote: Good quips always sail over at least one person's head. K9ZTV __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Buggy software OT
I wonder if the design not being done to spec / //The primary cause of this discrepancy was that one piece of ground software supplied by _Lockheed Martin http://en.wikipedia.org/wiki/Lockheed_Martin_produced results in a _United States customary unit http://en.wikipedia.org/wiki/United_States_customary_units_(American), contrary to its Software Interface Specification (SIS),/ qualifies as a bug -- vs. a design mistake? Phil W7OX On 1/17/15 12:30 PM, KENT TRIMBLE wrote: Facts can also be factual. Kent K9ZTV /On November 10, 1999, the Mars Climate Orbiter Mishap Investigation Board released a Phase I report, detailing the suspected issues encountered with the loss of the spacecraft. Previously, on September 8, 1999, Trajectory Correction Maneuver-4 was computed and then executed on September 15, 1999. It was intended to place the spacecraft at an optimal position for an orbital insertion maneuver that would bring the spacecraft around Mars at an altitude of 226 kilometers on September 23, 1999. However, during the week between TCM-4 and the orbital insertion maneuver, the navigation team indicated the altitude may be much lower than intended at 150 to 170 kilometers. Twenty-four hours prior to orbital insertion, calculations placed the orbiter at an altitude of 110 kilometers; 80 kilometers is the minimum altitude that Mars Climate Orbiter was thought to be capable of surviving during this maneuver. Post-failure calculations showed that the spacecraft was on a trajectory that would have taken the orbiter within 57 kilometers of the surface, where the spacecraft likely disintegrated because of atmospheric stresses. / /_The primary cause of this discrepancy was that one piece of ground software supplied by _Lockheed Martin http://en.wikipedia.org/wiki/Lockheed_Martin_produced results in a _United States customary unit http://en.wikipedia.org/wiki/United_States_customary_units_(American), contrary to its Software Interface Specification (SIS), while a second system, supplied by _NASA http://en.wikipedia.org/wiki/NASA_, that used those results expected them to be in metric units, in accord with the SIS. _Software that calculated the total impulse produced by thruster firings calculated results in pound-seconds. The trajectory calculation used these results to correct the predicted position of the spacecraft for the effects of thruster firings. This software expected its inputs to be in newton-seconds.^[16] http://en.wikipedia.org/wiki/Mars_Climate_Orbiter#cite_note-Mishap-17 / // /The discrepancy between calculated and measured position, resulting in the discrepancy between desired and actual orbit insertion altitude, had been noticed earlier by at least two navigators, whose concerns were dismissed. A meeting of trajectory software engineers, trajectory software operators (navigators), propulsion engineers, and managers, was convened to consider the possibility of executing Trajectory Correction Maneuver-5, which was in the schedule. Attendees of the meeting recall an agreement to conduct TCM-5, but it was ultimately not done./ On 1/17/2015 1:41 PM, Lynn W. Taylor, WB6UUT wrote: Good quip, but it doesn't agree with the findings of the Mars Climate Orbiter Mishap Investigation Board. Facts can be so inconvenient. On 1/17/2015 11:15 AM, KENT TRIMBLE wrote: Good quips always sail over at least one person's head. K9ZTV __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Buggy software OT
On Sat, Jan 17, 2015 at 4:40 PM, Dick Dievendorff d...@elecraft.com wrote: Software work helps one with humility... If software developing hasn't already beaten one into mumbling and slurring of words without any assistance from the juice. I remember so many days going home with a splitting headache, literal pain. 73, Guy. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Buggy software OT
I think there is a big difference in flight software. In Boeing airplanes the pilot is assisted by software. In Airbuses the pilot is allowed to fly the airplane if the software thinks he/she is qualified. There has been at least one airbus crash blamed on software and several other questionable crashes. Unix has a dam-it key. (Dam it let me do this even though you (the computer) think it's wrong.) I bet the airbus pilots wish they had one too. Fred, AE6QL -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of ANDY NEHAN Sent: Saturday, January 17, 2015 12:19 AM To: elecraft@mailman.qth.net Subject: [Elecraft] Buggy software Many moons ago I worked at a bank (software dept) and we had been running a daily check reading program reading the magnetic line from a check and sorting accordingly. Well this program read 600,000 checks a day - every working day of the year (that's about 250) then after it had been running about 6 years it fell over one day - a particular combinations of checks and the way they were batched. Now that sounds to me like a LOT of testing (600,000 * 250 * 6 = 900 million). So to expect all software to be perfect is not realistic. As to not using or trusting software - well whatever you do don't fly as all modern aircraft are software platforms!! Andy G4HUE __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
