I am keen to add support for the FT70. I have made a start based on the FT1. 

So far

Read the radio
Some of the memory and bank display correctly.

A few questions I would like to ask

  _model = "AH51G"

    _memsize = 65130  # But 65227 bytes read from dump

    _block_lengths = [10,65227] # ???????????????? on FT1 memsize - 10

    _block_size = 32

    _mem_params = (900,            # size of memories array

                   900,            # size of flags array

                  )

I want to understand the _memsize, _mem_params and _block_lengths any hints?
Any suggestion on handling the checksums? 
Other radios that "might" be similar ? FT60?
Other suggestions, references?

Thanks! I am keen to continue my work  as it would be great to add the FT70     

Nicolas