| File | Size | Date |
|---|---|---|
| etc | dir | |
| usr | dir |
Fifth Edition UNIX was released by Bell Laboratories in June 1974.
It was designed to run on the PDP-11s with 18-bit addressing and without separate Instruction and Data spaces, for example the PDP-11/40. The kernel's image size was around 26 Kbytes. At this stage in the development of UNIX, neither the Standard I/O library nor the Bourne shell existed, and the editor was ed.
The files in this area were supplied by Dennis Ritchie. Unfortunately, the on-line manual pages and documentation have been lost.