Sorry, I didn't know you were using a Mac, I missed that before answering on my phone. To see if the chipset
is support on the Mac, you can just plug it in and see what happens. However, I think the Microbit guys wrote
before that the Mac is not supported.
Then I guess you need a USB to serial converter and I also recommend one with a FTDI chip.
73,
Mitch DJ0QN / K7DX