AVR-Chat

>> Those are SIMILAR but the the MISRA standard is really aimed at "mission
>> critical" safety issues where human life may be involved. AFAIK, this
>> came, at least partially, out of the BART (San Francisco) subway
>> accident
>> in which a speed control unit failed.
>
> Is there a good writeup on that incident from our perspective?
>
> --
> There is no computer problem which cannot be solved by proper
> application of a sufficiently large hammer.
>

I wish I knew of a good write-up. As I recall, it was in the 1960s and
much of the more direct documentation has not made it into the
internet-age. There are some second, third, and fourth hand retellings but
I don't know of specific references.

It was an odd one in which, I think, the clock oscillator of one
controller board went way out of spec (perhaps due to a bad crystal) and
the fail-safe software interlocks were not built to detect that kind of
failure. There may also have been some contributing software flaws that
were exposed as a result of the larger failure.

Jim