So is that ASA only? watching college and the slap hitters all have one foot out and a USSSA Tourney I watched a couple of weeks ago batters started really far up in box, however no box but was clearly one foot out...What about high school as well?
This one is universal. The rule is the same from T-Ball to the Major Leagues...and everything in between.
As H-Dad noted, for the batter to be called out the foot must be in contact with the ground and entirely out of the batter's box at the same time the pitch contacts the bat to call the batter out.
The foot an be in the air, bat hits ball, then the foot lands outside the box...legal.
Also, the lines of the batter's box are considered to be part of the box. The foot on the ground has to be completely outside the lines. If even one tiny sliver of the foot is touching the line when the ball is hit, the batter is considered to be in the box...legal.
If no batter's boxes are drawn, all of the rules pertaining to the batter's box still apply. The only difference is that the size and location of the box is now at the umpire's judgment. You do hope that the umpire has some solid notion of where the box should be located and how big it is. With no box chalked out, we are told to give the batter every benefit of the doubt on foot placement and to not nit-pick this call. In that case we should only call this if the batter is grossly, obviously and blatantly out of the box.