I think the ][+ was the first one with the stiffer reset spring. The other thing that tripped up newbies was the power light on the keyboard that wasn't a swit

I think the ][+ was the first one with the stiffer reset spring. The other thing that tripped up newbies was the power light on the keyboard that wasn't a switch (you had to reach around the back left of the unit and fumble for it).