Just a little sidenote: You can use the multi-quote function instead of making posts right after each other (like below).
Quote:
Originally Posted by TRANZIT JIM
Eg, Does the computer just send to the pen drive, " I want to load X file" and then does the pen drive just respond by sending to the computer the details of that file?
Or, must the computer operate the pen drive directly?
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I'm not exactly sure what you are getting at with that, but the pen drive is only a storage device. The computer/processor is what provides the information to be stored and retrieved.
Quote:
Originally Posted by TRANZIT JIM
My plans are to build a computer type device from scratch ...
Having a P.C. style motherboard does not suit what I plan on doing.
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Can you explain more of what you're planning?
Quote:
Originally Posted by TRANZIT JIM
...but could anyone provide me with details about what the other three do?
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Gee, I don't know about those. I just copied that down from a VOIP diagram.
Maybe someone else will be able to help you more with some of this stuff!
Dave 
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