IBM Mainframes: Architecture and Design

308X series 370 architecture 370/XA architecture address space architec arithmetic block multiplexer channel buffer called central processor central storage channel program channel subsystem Chapter chitecture concepts condition code control register control unit data address data transfer decimal decoded device disk drives doubleword dynamic address translation EBCDIC Element expanded storage fetching field Figure floating-point format functions HALFWORD hardware I/O instruction I/O interruption I/O operation IBM mainframes implementation indicate instruction set LOAD logical main storage mask bit memory microcode microprogram mode models multiple multiprocessing old PSW operand operating system page table performance prefetched Principles of Operation processor storage read/write head real address real storage second operand segment table specified Status Word storage control storage key storage location storage protection STORE struction subchannel Subsystem Controller System 38 System Controller tion track vector virtual address virtual storage von Neumann machine zero