30 Jan '16, 10pm

Instead of a medal, one proud engineer receives a reprimand following an unauthorized simulator fix:

In 1979, I was on assignment for a contract to update the radar simulator for the C-5A flight simulator at Altus Air Force Base. I was working for Lockheed Aircraft (now Lockheed Martin Corp). Work was progressing reasonably well until it was time to integrate the radar system with the main flight-simulator part of the system. While doing so, I noticed a considerable amount of drift in the flight portion, an integral part of what sends data to the radar part. I thus had to investigate why there was so much error. The flight system used the 24-bit-word SEL840, at the time a state-of-the-art computer from SEL (System Engineering Labs). The big computer used 64 kbytes of core memory and had discrete component boards with RTL (resistor-transistor-logic) devices (circa 1975). The entire system worked from one sample-and-hold circuit. All of the inputs were either digital, such ...

Full article: http://www.edn.com/electronics-blogs/tales-from-the-cube/...

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