Most of the ASCII character codes make sense in the context of data transmission, e.g. ␄, ␗, ␖ (end of transmission, end of transmission block, synchronisation). However, there are also codes such as ␜, ␝, ␞, ␟, ␙ (file separator, group separator, record separator, unit separator, end of medium) which make less sense in the context of data transmission and more in the context of low-level file management on tape or disk.
As pointed out by Mauri Markowitz, the character codes do make sense in the contexts of storing read cards from a card reader, to separate the data from cards. Was this taken to its logical extreme?
Was ASCII used as the basis of any file systems / encapsulation formats? If so, which?