I don't think that a single mini HDMI can do both inupt and output video.
I think it is called HDMI 2.0
There is NO such thing as HDMI 2.0. The latest version is HDMI 1.4. There have been no commercial products released yet under this HDMI 1.4 standard, that will bring 4Kx2K resolution support. The latest commercially available HDMI standard is HDMI 1.3.
DC connectors are poorly standardized, there are dozens of different types.
They make very cheap adapters for these. Here in the US they are like $10 for 20 different adapters for these.
Yeah, and thousands of people burn their devices by plugging the wrong chargers to them with the wrong voltage, amp and polarity.
So Archos may just as well put the full charger behind a proprietary connector, the same connector that does all high bandwidth (up to 3gbit/s) and high power connectors.
Which connector does 3gb/s? I know USB2.0 doesn't, USB 3.0 maybe.
Archos connector has always been more powerful than USB and much faster in terms of its potential for bitrates.
The Archos proprietary connector is basically like USB 3.0.
So when USB 3.0 is released, Archos can just release a new mini Dock to support it.
What it means is that you could transfer a 700MB movie in less than 15 seconds.
Cause although USB3 is supposed to have a theoretical speed of 3gbit/s, it'll probably perform at around 0.5gbit/s for a start in actual transfer speeds.
HDMI in itself requires up to several Gbit/s in bandwidth, to output that HD digital quality image. I don't know exactly how much Archos is outputting at 720p HDMI, but I am guessing that it might be upwards 1gbit/s. So it has to go through a proprietary Archos high bandwidth connector or through a mini HDMI output.