This UIC contains a version of CHESS that I found on the RSTS tapes which started me believing that the division of libraries between processors and then operating systems was probably no longer appropriate. Anyway, the task file was built under the RSX run time system under rsts and has run fine on several real RSX systems for quite a while. I think the source originated from RT11 (one TARLUG memeber reports finding a copy hidden on DEC's maintenance pack) and if you build it, it has a few error messages which you can ignore as the code is never gotten to (according to Gerry Mintz at the University of Toronto). Better yet maybe someone can tidy it up and send it back. Russ Brown