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 |
