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It is reversible! The reversibility is largely provided by the PCB edge connector as you've identified. More details here [0]

[0] - https://microsoft.github.io/jacdac-docs/ddk/design/#pcb-edge...

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The original jackplug was also just as simple. Instead of 3.5 they could have gone for the 2.5" to avoid confusion as an audio out. But the new proposed cable? Is it available? Seems to be more work to offer.

/me checks taobao again

Nope, still not.

Kittenbot devices came with a standard audio jackplug. Easy cabling, off the shelf.

Ah, was that the origin of the name I wonder? Definitely would have been a nice idea. I'm also not fond of the custom connector.

Although, thinking about it, I wonder if the connector is designed for sequencing (power/ground first, then data) and if the linear insertion of the jack plug caused issues with that, since when the plug is being inserted the connector nearest to the outside contacts all three of the rings on the jack in turn.

Yep, it wasn't perfect and might cause issues with shorting the terminals briefly.

But this wasn't originally for rocket science, but simple DIY projects or kids projects. If repositioned it will have a hard time getting adopted.

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