A supercomputer developed at BBN Technologies, named after the "butterfly" multi-stage switching netwORk around which it was built. It could have up to 512 CPUs connected to allow every CPU access to every other CPU' s memORy, albeit with about 15 times the latency than fOR its own. The earlier GP-1000 models used up to 256 {MotORola 68020}s. The later TC-2000 models used up to 512 {MotORola 88100}s. Language developed fOR, OR pORted to, the BBN Butterfly were Butterfly Common LISP, Butterfly Scheme, Delirium, and MultiScheme. . (2003-11-10)