Mac, Unity 4+, write to serial ports?

Is it now possible (4.6) on a Mac to write to serial ports?

So, with this typical sort of code ..

 using System.IO.Ports; ...
 _serialPort = new SerialPort(); ...
 _serialPort.Write (sendbuffer, 0, 3); ...

Does it work on a Mac?

And also a question for my Windows friends ..

Just TBC, windows friends, this all works normally with your USB ports on your Windows 8 machines? thanks!

Bonus question -- I guess Windows on Parallels and making the USB ports work, would be natty. Any ideas?