(2022-07-18, 21:24)Orion Pobursky Wrote: 1.0 is the only one with an AC socket. Also, 1.5 doesn't have 1.5 on the side.
The 6 digit code is a serial number.
Aside from that, I not aware of any other visual differences but Philo can correct me if I'm wrong.
More precisely, the so called 1.5 (that came in robotics invention system 1.5) does have 1.0 on side, and lost the ac adapter plug.