The MegaPi is not recognized in the USB connection options of Arduino 1.6.13.
The Arduino Mega is recognized.
The Arduino Uno is recognized.
Selected Arduino/Genuino Mega or Mega 2560, also tried Arduino Mega ADK, as the board in the tools menu of Arduino IDE.
Process for connecting includes: power on the MegaPi with the onboard slide switch, paused for boot up, plugged in to USB port, paused for USB recognition. Attempted to load Blink code.
Plugged in the MegaPi via USB, paused for boot up, applied power to board via the slide switch. Attempted to upload Blink code.
Both attempts failed.
Regression testing for cable - separately connected known good Arduino Uno and Arduino Mega with same USB cable, to same USB port. Uploaded Blink, modified and reloaded Blink to verify process completion. No issues.
Hardware: Macbook Pro running Sierra OS 10.12.2.
Software: Arduino IDE 1.6.13
Thanks,
Loch