NO, the 11/23 has an MMU and was perflectly capable of running UNIX. The 23+ had the extra address lines allowing it to address 4 MB like the 11/70. ------ Original Message ------ From "Adam Thornton" To "Ron Natalie" ; "The Eunuchs Hysterical Society" Date 12/5/2024 9:29:24 PM Subject Re: [TUHS] Re: Pipes (was Re: After 50 years, what has the Impact of Unix been?) >/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. >>