On 2013-01-06 21:18, Johnny Billquist wrote: I think only the 11/130 had the TU58. The /110, as John mentioned, supported only downline loading of the system from somewhere else. I know I've seen the manuals... Hmm, hang on... Ah! Found it. The PDT-11/150 documents sits under pdp-11 on bitsavers. The PDT-11/110 and /130 sits under terminals on bitsavers. That's why I didn't find it at first... And of course, reading through manuals always gives answers... Yes, it's RSX-11S that was supported on the PDT-11. Page 1-5 of the PDT-11/110 and /130 manual. Hmm, reading through this a bit more, it would appear that the /110 was intended for RSX, while the /130 was intended for RT-11. Makes sense, I guess, since you could have a pretty full RT-11 environment there, but for RSX, you'd need some other system for the development, and run the PDT-11/110 with no mass storage, and 11S downloaded at boot, running diskless. Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol