had two processors: a Control Storage Processor (CSP), as in System/32, which handled most supervisor and input/output operations, and a Main Storage Processor (MSP). This latter was a re-implementation of the System/3 model 15 processor; effectively providing "hardware emulation" of the System/3. See also Distributed Data Management Architecture IBM System/370 References Further reading "Everything You Always Wanted to Know About the System/3 But Nobody Told You" by Charlie Massoglia "System/3 Disk Sort as a Programming Language" by Charlie Massoglia "System/3 Programming RPG II" by Solomon Martin Bernard, 1972, "An introduction to computing: IBM System/3" by Jerome T. Murray, 1971, "Business System with Punched card data processing and System/3 Model 10", by F. R. Crawford, 1973, External links Original vintage film from about 1969 Computer History Archives Project A System/3 under restoration at the CoreStore IBM System/3 website IBM System/3 Models 8, 10, 12, and 15 Components Reference Manual System 03 16-bit computers