On Wed, Jan 5, 2022, 8:27 PM Douglas McIlroy wrote: > > It would be nice to hear about the rationale from a primary source. > > Assembly language was deemed a last resort, especially as portability > was coming to the fore. As I wrote in A Research Unix Reader, > "Assembly language and magic constants gradually declined from the > status of the 'real truth' (v4) to utterly forgotten (v8)." In v7, > assembler usage was demoted to the bottom of syscall man pages. It > could also be found in /usr/src/libc/sys/*.s > That makes a lot of sense. I've found errors and omissions in the assembler documentation for the odd system call for V7 and System III ports. A little sloppy I thought when I noticed. I'll have to see if I can dig one up again... Warner >