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Revisiting this game, I still can't figure out the computer.  There are plenty of plausible messages that can be copied and subtly modified from the poster on the far right, some exactly 24 characters long, but nothing that I've tried has worked.  As far as I can gather, the input is meant to be general commentary on the setting of the game: a ruined planet Earth devoid of life.  Alas, the English language is too flexible to guess the right wording!

Or perhaps the real twist is that you didn't code an ending, leaving us instead to ponder the last lamentations of a wizened digital elephant.

The passcode is "elephants never forget"