but why if I use
sudo avrdude -c avrispv2 -p m1284p -P /dev/ttySA0 -t -v -v
i see
avrdude: Device signature = 0x1e9705
avrdude: safemode: lfuse reads as FF
avrdude: safemode: hfuse reads as DC
avrdude: safemode: efuse reads as FD
but when i enter in terminal mode and type command sig
the result is
Device signature = 0x000000