RISC System/6000 RS6000 RS/6000 RS6K <computer> (Or "RS/6000") {IBM}'s current {RISC}-based {Unix} computer. The RS/6000, announced in 1990, replaced the {RT-PC}. It runs {AIX} 3.x and 4.x. Most models have an {MCA} bus. A wide range of models are available. (1995-04-06)