I was there as well, also as an intern. Around the same time, Mandelbrot also stopped by CNLS to give a talk. CNLS in the late 80s was truly a magical place.
It was pretty amazing. I recall Doyne Farmer was there too - he had this crazy custom coprocessor card for his cellular automata explorations. I got to write some stuff to run on a CRAY Y-MP. Got to to play with NeXT black box serial no. 36. (LANL had the first 50 I think). Lots of crazy cool people and tech!