Jasen Betts wrote in a message to Roy J. Tellason:

 RJT> Local computer store guys tell me that I should be seeing a 4-pin
 RJT> connector.  that's computer salespeople for you.

Yeah,  probably.

 JB> 4 contacts on the outside of the case, 5 if you count the
 JB> shell/sheild. 

 JB> I think the 10 way socket goes to 2 USB sockets outside the case. 

I hadn't realized until the second look that this 10-pin header was for
*two* connectors.

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