Steering code generating apparatus for use in an input/output processing system

摘要: An input/output processing system includes a plurality of active modules, passive at least one memory module and interface unit having ports, each which connect to different the modules. The modules include an processes interrupts executes command sequences multiplexer directly controls transfers between any peripheral devices coupled ones ports unit. operatively provides connections apparatus for generating steering codes defining physical location requiring service by another system. appends information provided particular requesting request attention code generated. generation included in such requests insures that only authorized accesses are made during unit's execution programs running associated therewith.