Wow! I remember reading 3D0G in one of the many apple manuals that came with my Apple ][+ I filed it away in my memory and used it every time I accidentally ended up with a * prompt. It feels good to know others have fond memories of those days too.
The earlier Apple ]['s would dump you into the monitor instead of Applesoft when you hit the RESET key, after resetting the CIN and COUT vectors which disable DOS, so you had to type 3D0G to warm start DOS, hook them back up and re-enter BASIC.
The RESET key was so unfortunately placed, and earlier models had very soft springs, which Apple eventually stiffened in later models, so there was a whole industry of after market RESET key protectors [1] (like a square plastic tube that slides over the key so you have to stick your finger down into it to RESET), to prevent you from having to type 3D0G so often.
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).
TIL the name of that band [1] was suggested by the June Fairchild, the Cheech and Chong "Ajax Lady" [2].
[1] https://en.wikipedia.org/wiki/Three_Dog_Night#Band_name_orig...
[2] https://www.youtube.com/watch?v=WREo-_R9uyc