The CDC Cyber range of mainframe-class supercomputers were the primary products of Control Data Corporation (CDC) during the 1970s and 1980s. In their day, they were the computer architecture of choice for scientific and mathematically intensive computing. They were used for modeling fluid flow, material science stress analysis, electrochemical machining analysis, probabilistic analysis, energy and academic computing, radiation shielding modeling, and other applications. The lineup also included the Cyber 18 and Cyber 1000 minicomputers. Like their predecessor, the CDC 6600, they were unusual in using the ones' complement binary representation. Models The Cyber line included five different series of computers: The 70 and 170 series based on the architecture of the CDC 6600 and CDC 7600 supercomputers, respectively The 200 series based on the CDC STAR-100 - released in the 1970s. The 180 series developed by a team in Canada - released in the 1980s (after the 200 series) The Cyberplus or Advanced Flexible Processor (AFP) The Cyber 18 minicomputer based on the CDC 1700 Primarily aimed at large office applications instead of the traditional supercomputer tasks, some of the Cyber machines nevertheless included basic vector instructions for added performance in traditional CDC roles. Cyber 70 and 170 series The Cyber 70 and 170 architectures were successors to the earlier CDC 6600 and CDC 7600 series and therefore shared almost all of the earlier architecture's characteristics. The Cyber-70 series is a minor upgrade from the earlier systems. The Cyber-73 was largely the same hardware as the CDC 6400 - with the addition of a Compare and Move Unit (CMU). The CMU instructions speeded up comparison and moving of non-word aligned 6-bit character data. The Cyber-73 could be configured with either one or two CPUs. The dual CPU version replaced the CDC 6500. As was the case with the CDC 6200, CDC also offered a Cyber-72. The Cyber-72 had identical hardware to a Cyber-73, but added additional clock cycles to each instruction to slow it down. This allowed CDC to offer a lower performance version at a lower price point without the need to develop new hardware. It could also be delivered with dual CPUs. The Cyber 74 was an updated version of the CDC 6600. The Cyber 76 was essentially a renamed CDC 7600. Neither the Cyber-74 nor the Cyber-76 had CMU instructions. The Cyber-170 series represented CDCs move from discrete electronic components and core memory to integrated circuits and