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Carl writes:

> Seriously though, allowing anything to run on one of these computers
> other than the task at hand would be asking for trouble, you now have
> a multitasking OS that has REAL TIME work to do.  Think of it - how
> can you guarantee that a user wouldn't crash the machine?  (this is
> possible, but it makes the operating system a LOT more difficult to
> write).

If I were designing the rebreather, I wouldn't roll my own RTOS.  I
would buy a proven, off-the-shelf one like Ready System's VRTX, that has
had millions of hours of time in fighter aircraft, ships and weapons
systems.

I would also make the software fault tolerant, so as to handle or
gracefully degrade in the event of systems failures.  I would also
implement extensive built-in test (BIT) features to test as many on-board
systems as possible, and alerts to warn the user of various conditions.

Another thing I would do is an in-depth analysis of the mean-time
between failure (MTBF) of the various components I am putting in my
system.

Is there a rebreather that has all these protections designed into
it?  How about the Cis-Lunar?

Christina

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