On Jul 2, 2012, at 10:58 AM, Bob Armstrong wrote: Was that the RTOS used with the T-11 (the first single-chip PDP-11?) I seem to remember that it was used as the RTOS in the LA-120 printer. Did the LA120 have a T11 in it? Wow - makes me want to go take mine apart and look :-) It's good that you brought this up, because I was going to ask about examples of devices that used embedded PDP-11s, probably mostly DEC made but not always. For example, the RFxx drives (all of 'em, I think) used a T11 and I'm pretty sure ran some variant of RSX-11S. Not the RF11 :-) paul