My son has a Samsung Galaxy Tab 3 8", and my wife has (and daughter is about to get) the Tab 4 8". Samsung in the US has this: EPL-AU10WEGXAR, which is only listed as compatible with the 3. It seems nothing so far is officially compatible with the 4, which is really annoying. Does anyone know if that connector is compatible with the 4, or indeed, would any old micro-USB to USB adaptor work (and if so, where did you get yours)? There may be some special sauce, because other sites seem to imply that the port on the device could also carry HDMI.

I ask because I would like the kids to be able to use a keyboard at home and I am too cheap to buy two Bluetooth keyboards, too jaded to struggle with pairing one keyboard to two tablets, and in any case feel that a full size keyboard would be better overall.