> 
> James, 
> 
> As I understand it, the FT232RL and FT245RL parts from FTDI 
> can be used to create such dongles.  I'm remembering this 
> from a blurb I saw on their web page.  May have been 
> advertising hype, may have been an application note.  
> Probably worth a quick look at www.ftdichip.com.
> 
> Another that comes to mind is Griffin Technologies.  Might 
> also be worth contacting them.  www.griftech.com.
> 
> Rob
> 

OK, just checked on Griffin Technology's web site and their main product
is intended to lock down a PC so that you can't use it at all unless the
magic dongle is plugged in.  Not what you described but still, give them
a phone call.  They might have some suggestions anyway.

Rob
(Not affiliated with GT Security but I do try to support local
businesses...)

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist