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This is still being supplied with the latest rev c high contrast primes, but what is its purpose?
The quick start guide ( second edition March 2016 !) suggests prime to prime comms using the send button, which afaik doesn't exist anymore.

So what is the lead for?

Hello,

That was only for the rev A units (very early). You can send between calculators currently without trouble.

Thanks Tim

So the Send menu appears when two physical Calcs are linked?
Would this also work between a physical calc and the android app - ie calc connected direct to app on an android phone?

/Steve

I don't think so. We ran into trouble trying to abstract usb communication and I don't think there was a good solution and just turned it off.