MicroPython Board won't connect using screen /de/tty.usbmodem

[rhinerfeld]

MicroPthon Board won't connect via screen /dev/tty.usbmodem*
Using a Mac Book and OSX version 10.5.8.
The following errors occur:
AppleUSBCDCACM: start -find CDC driver failed
AppleUSBCDCACM: start : Interface Mappings dictionary not found for this device.

Called Apple for help and they were totally useless.
They kept me on the phone and then told me that there nothing wrong with their OS
and that it is the fault of the device manufacture.
Please note that two difference devices do the same thing.
the MicroPython Board and a MSP430 Development board.
What is missing is /dev/tty.usbmodem*

Please also note that both device work correctly in Fedora 20 Linux using VMware on the same Mac Book.
After this conversation with Apple, I will no longer purchase any Apple products in the future.

[blmorris]

It works and is pretty well tested with OSX 10.7.5 (my own system) and several other users have reported success with 10.9.x systems. I need to do some searching, but I think I remember a report of problems with the CDC USB driver on 10.5.x that was resolved with later versions.
You didn't mention which version of MicroPython you are running. It shouldn't matter for the CDC serial port emulation, but there was an issue with the mass-storage driver on OSX that got resolved around October last year.
-Bryan