CSE code breaking capabilities degraded substantially in the 1960s and 1970s but were upgraded with the acquisition of a Cray X-MP/11 (modified) supercomputer delivered to the Sir Leonard Tilley building in March 1985 and the hiring of code breaking analysts. It was, at the time, the most powerful computer in Canada. In the early 1990s, the Establishment purchased a Floating Point Systems FPS 522-EA supercomputer at a cost of $1,620,371. This machine was upgraded to a Cray S-MP superserver after Cray acquired Floating Point Systems in December 1991 and used the Folklore Operating System supplied by the NSA in the US. These machines are now retired.