Apple may have killed off the ubiquitous 30-pin connector, but that doesn't mean the dock is dead.

ENGADGET: 's holiday gift guide 2012: speakers and docks

An Epson ink-jet printer's connector fit, but 3Com's marketers don't mention that Bluetooth behaves like a serial port rather than a parallel one, making installation difficult and keeping many printers from reporting things like the status of ink cartridges or paper jams.

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