Quote:
I am wondering why the serial connector is used for on a homedock?


In Mark's dock, the serial connector works for everything except flash memory upgrades. The reason for that is here, as well as detailed descriptions of workarounds.

Even without the ability to do flash upgrades, the serial connector can be used for a lot of other stuff.

If you decide to insert your own barrel connector, make sure it matches the specifications.
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Tony Fabris