All punchcards are relatively easy to find. For solution to the puzzle, see "Terminal Solutions."



On a table on the left side of the room.



Turn right from the entrance of the room. It is on the floor before the stairs.



On a large table in the centre of the room.



On a white box in the back right corner of the room.



Turn right from the entrance of the room and go up the stairs. It is on the ledge overlooking the room. (The card is not in the screenshot because I picked it up already).

Place the punchcard with the symbol shown in the screenshot in it's respective terminal. Click photos to enlarge.

The whiteboard diagrams reveal the correct punchcards for each terminal.



With this diagram we are given which symbols correspond to terminals 1 and 4.



This diagram shows that symbol 4 should be in place of symbol 5 (arrow underneath). Now we know which punchcard to use for terminal 5.



The last diagram reveals the punchcards for terminals 2 and 3, but also that they need to be switched with one other (arrow underneath).