IBM B01 Service Manual page 284

Overview
Chapter 13. Overview
Description
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Figure 53. S/390 Integrated Server
The System 390 Integrated Server is a S/390 processor capable of taking advantage of the full range of
the ESA architecture. It is capable of attaching to ESCON or Parallel S/390 devices natively through
adapters or it can emulate S/390 devices including DASD, tape, communication and display controllers.
The IBM S/390 Integrated Server includes the P/390 adapter (generally referred to in this document as the
P/390) which provides a CMOS processor and 256MB of S/390 memory which provides S/390
functionality. All supported OS/390, VM, and VSE operating systems as well as S/390 applications run on
the IBM S/390 Integrated Server. The IBM S/390 Integrated Server makes use of an I/O and Service
Processor providing an environment for running device managers and emulating S/390 I/O.
The System 390 Integrated Server is a made up of two key processing components. An Enhanced S/390
Microprocessor (P/390 complex) provides the S/390 ESA instruction set and runs the VM/ESA, VSE/ESA,
and OS/390 operating systems unmodified. Most S/390 applications run unmodified on the System 390
Integrated Server. The second component is an I/O and Service Processor (IOSP) utilizing a
high-performance Pentium "processor. This 10SP provides an execution environment for the programs
which provide the S/390 I/O emulation.
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