Don't get confused between the ETRAX 100LX and the 100LX MCM - the MCM is $75 and isn't available in large quantities yet (last I heard). The ETRAX 100LX is not a system-on-a-chip - its been around a couple years - it's selling for $40.
As for the triple redundancy problem. Before you start going into your ANDs and ORs and wherefores, there are a few things to keep in mind. First off, if its really important, you need some non-local copies. What if there is a hard-drive crash? Or a nuclear war? The internet will still be around even if the main office is a glassed over glowing area in the North Western U.S. If it's important enough for triple redundancy, it's important to survive any forseeable catastrophe isn't it? So now you have to encrypt the numbers coming and going, and sign it, to keep the hackers from fooling you.
I was thinking this redundancy might be useful in a space probe, where you can't rely on your memory to be error-free over its lifetime, for example, 30 years in the case of pioneer10. Getting the result in the fewest ops would be especially useful on a chip from 30 years ago. I wouldn't use it for an interview question, though.
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somebody mod parent up, please!
I'm a PalmOS developer and this comment nicely summarizes some real issues we face.
thanks goofrider!
Why use a back door, when the Windows is open?
Don't get confused between the ETRAX 100LX and the 100LX MCM - the MCM is $75 and isn't available in large quantities yet (last I heard). The ETRAX 100LX is not a system-on-a-chip - its been around a couple years - it's selling for $40.
I wouldn't use it for an interview question, though.