Actually, the 8600/8650's used the T11 chip on a special board. They ran RT11 (a version of it that was standard enough to let me run RT11 adventure on the front end of an 8650). -- d|i|g|i|t|a|l had it THEN. Don't you wish you could still buy it now! pechter-at-gmail.com On Mon, Jul 2, 2012 at 11:01 AM, Bob Armstrong <bob at jfcl.com> 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. Oh, and I almost forgot - the only use of RT11 that I know of for an "embedded" system was the CFEs for the VAX 780 and 8600 (on a 11/03 in the former and a PRO in the latter). Are there any more? Bob