On Sun, 1 May 2016 12:27:06 +0200 Jörg Hoppe <[email protected]> wrote:
> Bob, > > > On Sat, 30 Apr 2016 21:03:35 +0200 > > Jörg Hoppe <[email protected]> wrote: > > > >> The header line says it all: another panel for BlinkenBone is > >> there, the classic PDP-11/20. > >> In function and style it fills the gap between the PDP-8 and the > >> later PDP-11's. > >> > >> The GitHub distribution starts the 1970 Paper-tape BASIC, download > >> here: https://github.com/j-hoppe/BlinkenBone/releases > >> > >> For info see > >> http://retrocmp.com/projects/blinkenbone/simulated-panels/253-blinkenbone-simulated-pdp-11-20-panel > >> and next page. > > > > Thank you! That was the first PDP-11 I ever used (and programmed in > > MACRO-11). > > > > I ran DOS/BATCH and also RT-11. And I also ran a UNIX system on it. > Do you remember which UNIX? > I always considered the 11/20 to be too weak for that (no MMU, > despite 18 ADDRESS switches&lamps). Or am I wrong? Pretty weak, but OK for one person. This was Mini-UNIX. Main differences: only one process in memory at the same time, simulated pipes, no groups. This was circa 1977 I guess. I still have the manual somewhere. The way it worked was that the kernel lives in the bottom 16kW, and processes were all linked to a base of 16kW. _______________________________________________ Simh mailing list [email protected] http://mailman.trailing-edge.com/mailman/listinfo/simh
