The 6502 core in the 2A03 and 2A07 is the only I know of that had the BCD support removed, which reduced licensing fees as the BCD circuitry was the only patent

The 6502 core in the 2A03 and 2A07 is the only I know of that had the BCD support removed, which reduced licensing fees as the BCD circuitry was the only patented part of the 6502. That's my guess as to the meaning of the ".7"