Thank you so much for posting this! What a treasure for some of us UNIX geeks.

Quick analysis of what's in there by Claude, the analog.tap is a SIMH tape format which has a tp format archive enclosed in it, which has the following stuff in it:

  Summary by Category:                                                   
  | Category       | Files | Size   | Description                    |   
  |----------------|-------|--------|--------------------------------|   
  | C Compiler     | 19    | ~75KB  | The historic 1972 C compiler   |   
  | Device Drivers | 5     | ~52KB  | Disk, tape, TTY drivers (1973) |   
  | Kernel/System  | 7     | ~57KB  | Core Unix kernel code          |   
  | User Commands  | 5     | ~47KB  | find, mail, su, if, glob       |   
  | Boot/Startup   | 8     | ~5KB   | PDP-11 bootstrap code          |   
  | Utilities      | 71    | ~400KB | Various tools and utilities    |