Prime sold a subsystem called Information which was more-or-less a clone of Pick, and from the mid-80s on, this may have been its best-selling product (I'm certain it was in the UK). But prior and subsequent to that, Primes were very prevalent as university timesharing systems, and laboratory support systems. The Primos operating system had its initial roots in an older OS they called DOS, which had some legacy from another Prime OS, RTOS, which in turn was a port or re-implementation of Olert/4 and/or SAMTRAN, a Honeywell Controls OS funded by NASA. Beginning with the P400 processor, Prime systems were 16-bit data/32-bit address versions of the Honeywell Multics architecture (which was 18-bit data/36-bit address). -doug q