Definitely A9-A10. I just tested with version 1v51 from the website and it works fine.
Are you sure you're not connected via the USB USER port as well? That would cause Espruino to put the console onto a USB virtual COM port by default.
USB USER
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Definitely A9-A10. I just tested with version 1v51 from the website and it works fine.
Are you sure you're not connected via the
USB USER
port as well? That would cause Espruino to put the console onto a USB virtual COM port by default.