On Oct 30, 2012, at 1:06 AM, John Wilson wrote: From: Dave McGuire <mcguire at neurotica.com> I had a PDT-11/150 many years ago, mid-80s. It was kinda fun, but also kinda pointless. The only thing you can run on it is RT-11. I had one too back then and had a blast! RT-11 is terrific (infinitely better than contemporary microcomputer OSes), and anyway a 150 will run pretty much anything an 11/03 will run (but with 30 KW of memory instead of just 28) so it's really pretty flexible. I wrote a FORTH-79 system on mine ... FWIW, for those who like Forth, there's a Forth implementation available as a run-time system on RSTS/E. It's part of the unsupported stuff on V10.1 (and possibly somewhat earlier, maybe as early as V9.0, I forgot). I did the port; I used it among other things for implementing an interactive crash dump analyzer *very* loosely modeled on VMS "SDA". paul