"Paul" bravely wrote to "All" (12 Jul 05 16:17:47)
--- on the heady topic of "Re: Weird Microwave problem - trips breaker when you
shut the door!"
Pa> From: "Paul" <[email protected]
Pa> Xref: aeinews sci.electronics.repair:53019
Pa> Note that the Therac25 was developed from an earlier machine which had
Pa> mechanical interlocks and when you pressed the same combination of
Pa> back spaces did blow a fuse, possibly 100's of people where over
Pa> exposed from what I remember and several fatally or damaged for life.
Pa> Do you remember in the 80's or 90's when people where installing there
Pa> own mobile phones in cars and where being warned it could mess up the
Pa> ABS and engine management causing accidents.
Pa> Then there was the F*rd Probe car which had a problem with the ECU
Pa> which meant interference from the ignition system could cause it to
Pa> accelerate out of control, a man was killed when his car flew off an
Pa> off ramp at over a 120 miles and hour into trees.
Pa> As for the $20,000,000 planes don't they have more than one computer
Pa> for all the main systems with the software written by different
Pa> companies, and the computers keep a check on each other to make sure
Pa> they are both working.
They do but they still manage to rip rudders off airplanes when the
pilot only moves the pedals 1-1/2 inches, like happened in New York
about a month after 9/11/2001. Just because software is in charge
doesn't mean it isn't safe. The problem is always GIGO and unless
inputs are properly validated then all hell will and does break loose.
Why don't software engineers get it already?