Configured to work with MEGA ADK board and ethernet/SDcard shield for convenience.  Moved all SPI select pins (lots of devices now) into busio.h
mostly working FDC model.  Need to work out sector reads
fixed most of the bus interactions, CRC, etc.
latest attempt at working fdc
Completely working FDC code
Addition of Ethernet library
these too
incorporating working control code, without ethernet support