This book is the eighth volume in the Historical Computing Machines series, which aims to document the history of computing machines from the late 1930s up to about 1995. It is focused on the Control Data Corporation’s early systems which reflected the design principles espoused by Seymour Cray. CDC developed and sold early machines as fast processors for use in scientific and engineering organizations. CDC’s early systems were batch-oriented and minimalist in their instruction sets. This volume covers the early CDC systems – from the CDC 160 through the CDC 3800 – in the evolution of computer architectures in the pursuit of fast computers, and describes their system software, their effect on programming language designs, and key applications. It also describes the later CDC 1700 and its successors, the Cyber 17/18 series of minicomputers. As such, this volume strives to bring together a comprehensive, but not exhaustive, view of the capabilities of early CDC computer systems.