CHAPTER ORGANIZATION Main Storage •.••.••••••.••••••.•.••••••..•••••.••••••••••. 2-3 CPU ..•••.••••••••••.••.•..••••••••..•••..••••.•.••...•.••• 2-3
PSW••....•..••..•..••.•••••..•••••.••..••.••.•.•••.••... 2-3
General Registers•.••.•...••••..•••....•.....•......•.•. 2-4 Floating-Point Registers ••.•••.•..••••.••..••..•.••....• 2-4
Control Registers•..••••••.•••.••......•.•.•••......•••• 2-4
Vector Facility..••.••..••••••••..••...•••.•••••.•.••.•• 2-4 1/0 .................•............•...........•.....•.•.... 2-4
Channel Sets.•..••.••......•.•......•...••••.•..••.•.••. 2-6
Channel s..•....••••••.•.•....•...•••...••.••••..•••••.•. 2-6 1/0 Devices and Control Units ...•.•.•..•.•••..••••••.••. 2-6 Operator Facilities ........•...•.••......•..•....••..•.... 2-6
logically, System/370 consists of main
storage, one or more central processing
units(CPUs), operator facilities, chan
nel sets, channels, and1/0 devices. 1/0 devices are attached to channels
through control units. The physical
identity of these functions may vary
among implementations, called"models." The figure "logical Structure" depicts
the logical structure for asingle-CPU system and for a two-CPU multiprocessing
system.
Specific processors may differ in their
internal characteristics, the installed
facilities, the number and types of
channels, the size of main storage, andthe representation of the operator
facilities. The differences in internal
characteristics are apparent to the
observer only as differences in machine
performance.
Chapter 2.Organization 2-1
PSW
General Registers
Control Registers
Vector Facility
Channel Sets
Channel s
logically, System/370 consists of main
storage, one or more central processing
units
nel sets, channels, and
through control units. The physical
identity of these functions may vary
among implementations, called
the logical structure for a
system.
Specific processors may differ in their
internal characteristics, the installed
facilities, the number and types of
channels, the size of main storage, and
facilities. The differences in internal
characteristics are apparent to the
observer only as differences in machine
performance.
Chapter 2.