There's a rocker switch on the backside. It's pretty much like the C64......in that way.
Also a hint: The Atari is a real computer, in that it can boot from an external drive, unlike the C64 where you have to type mysterious commands to load anything.
So, for most floppys with games, you turn on the disk drive, put the floppy in, hold Option on the XL/XE computers (to turn off Basic) while turning it on. The computer boots the OS from it's internal ROM (which is almost instantly) and than starts booting from floppy. Within a couple of seconds you get a nice menu which game to start, just type a letter (A,B,C) to start a game. Full floppy sized games simply load-up completely.
Anyway, you see that it is very comfortable to work with...no need to know any commands if you just want to play games
