/23+, no? The basic 23 doesn't have an MMU, I'm pretty sure. On Thu, Dec 5, 2024 at 11:58 AM Ron Natalie wrote: > I remember on MiniUnix (a stripped down kernel that would run on PDP11’s > without memory management, in our case 11/03, 11/20, and an older 11/40) > there were no kernel pipes (and limited process concurrency). > The shell used the aforementioned emulation of pipe by just running the > output of one process into a temporary file subsequently loaded as stdin > of the other. > > We kind of put all that to bed when the 11/23s came out and we could run > our full up kernel on the micros. > >