IIRC, Unisys's MCP doesn't have directories, just very long file names with separators in them. It's up to the applications to present that as a hierarchical namespace.
Now that I mention it, it'd be interesting to play with Apple's DOS 3.3 (33 char file names) that way.
Now that I mention it, it'd be interesting to play with Apple's DOS 3.3 (33 char file names) that way.