The six unused connections
I have finally had a chance to look at the spare connections on the Iliad. This is what I found:
13 - wired to 17 in the plug, but held to ground when disconnected
14 - High impedance, either an input or N/C
15 - signal on this line (see below)
16 - held to ground
17 - wired to 13, high impedance when disconnected, probably plug sense input
18 - High impedance, either an input or N/C
The only interesting pin was 15. This is nominally high (3.5v), but emits a start bit followed series of 16 data bits at approximately 9600 baud whenever a key is pressed or released. As far as I can tell, no other data (like a console) is present on this pin.
Sometime soon I'll take the thing apart and have a poke around inside for anything that might be a console.
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