Roff is a Unix typesetting markup language and predecessor to nroff and troff, descended from RUNOFF programs created for earlier systems like CTSS and Multics. Ken Thompson transliterated it into PDP-7 assembler around 1970, then again into PDP-11 assembly in 1971, where it formatted Unix man pages and became the first Unix application used by Bell Labs' patent department, helping secure funding for early Unix hardware.
A mock interview with an early UNIX creator discusses the system's development, debugging approaches, and influences from Multics. The interviewee reflects on early UNIX versions, preferences for print debugging over debuggers, and dismisses Multics despite acknowledging it influenced certain UNIX design decisions like the file system.