Tenex interface to UCSB's Simple-Minded File System
RFC 409, “Tenex interface to UCSB's Simple-Minded File System”, is an Unknown document published in December 1972 by J.E. White. The canonical text is published by the RFC Editor.
What “Unknown” means
The standards-track status of this early RFC was never formally classified.
The canonical text of RFC 409 is hosted at rfc-editor.org. Available in TXT,HTML.