[COFF] Supervisor mode on ye olde PDP-11

[Milo Velimirović]

> On Jun 19, 2024, at 1:49 AM, Dave Horsfall <dave at horsfall.org> wrote:
> 
> Sort of between kernel and user mode, Unix [zillion trademarks etc] never 
> used it. but did RSX-11?

I don’t know about RSX-11.

Back to UNIX: Supervisor mode probably never ran any code, but its memory management registers were used in m45.s in functions copyseg and clearseg. 

—Milo