If you look at the sockets, one end has a notch in it, and the silk screen on the Atari has the same notch marked:
Silk screen:
- notch.JPG (14.21 KiB) Viewed 506 times
Socket:
- socket.jpg (8.95 KiB) Viewed 506 times
And the orientation is specific, as the notch shows where the notch of the IC goes, or pin 1 (in yellow) if there is no notch in the IC, as some just have a dimple to show where pin 1 is.
It's important to line these up correctly in order to make sure your chips are plugged in correctly and don't get killed when you switch on. It is important to understand these things to make sure you don't make any mistakes when plugging chips in. It's all there to help you.
Also, it shows a level of diligence that you have understood the reasons why it should be that way round, and taken the time and effort to make sure it all looks right.
In your case at least 2 of the sockets don't have the socket notch lined up with the silkscreen notch.
