Yeah - they are different, but I'm pretty sure that Dale's work in CB UNIX came first. I know I saw the CB/UNIX code as hacks to PWB 1.0 I think (maybe 2.0) when I was still at CMU in 1978 (Phil Karn had it IIRC). I was under the impression that folks at Summit (e.g. UNIX Support Group) had the job of collecting different features that had been done and putting them into the AT&T 'Standard' for the operating companies. I agree it would be interesting to learn who did the work. But as I always understood it, Dale's team gave the CB/UNIX stuff to the USG folks who reimplemented it, I thought because USG was redoing the memory code and wanted something that would integrate better. I suspect it is also possible, Dale and his team redid it in the key of System V at some point and pushed it back. Clem ᐧ On Sat, Jul 24, 2021 at 2:38 PM Paul Ruizendaal via TUHS < tuhs(a)minnie.tuhs.org&gt; wrote: