When the iPad was introduced in April of 2010 it featured a single dock connector, as like we see today. The device was larger and heavier than the latest iPads, but everyone was still impressed at the time.
This prototype seen above is of the original iPad, and it does have two dock connectors. One was for landscape mode while the other is for portrait. This matches a rumor just months before the release which stated dual dock connectors would be featured. Apple even went as far to get a patent for the idea. But they later dumped the idea to ensure the iPads design wasn’t to complex.
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The iPad works well, just like a typical first generation iPad. The only noted problems relate to the screen. The ribbon is not being held onto the digitizer because a clip is missing from the device. Also, all parts are original from the prototyped device besides the battery.