IBM System/370 Guide

SECTION 60: PROGRAMMING SYSTEMS PREINSTALLATION PLANNING
Because extensive hardware and programming systems compatibility
exists between the System/370 Model 165 and System/360 models, most
Model 65 and 75 OS users can upgrade to a Model 165 with a minimum
of effort. This is also true for users of ASP (Attached Support
Processor) who wish to upgrade a Model 65 main processor to a Model
165. Essentially, no more effort may be involved in the installation
process for OS MFT and MVT users than is required currently to change
from one operating system release to another, or to regenerate an
operating system to include new hardware, new I/O devices, and more
control program options.
It also may be desirable to expand the design of the system - add
new applications, use additional control program facilities, etc. -
as a result of a sizable upgrade in the hardware configuration. In
most cases, the fact that an MFT or MVT user is upgrading to a Model
165 should not add to the effort that would be required if these system
changes were to be implemented for a Model 65 or 75 upgrade to another
System/360.
60:05 OS MFT AND MVT TRANSITION
A system generation must be performed using an OS release that
includes Model 165 support in order to obtain an MFT or MVT operating
system designed to support new Model 165 features. The existing system
generation job stream can be used with the following modifications,
as appropriate:
• Direct access space allocation for operating system data sets will
have to be adjusted as indicated in IBM System/360 Operating System,
System Generation (GC28-6554). If a 3330 or a 2305 facility is
to be used as a system residence device, UNIT parameters in job
control statements must be changed where necessary.
• Stage I input must be modified to reflect the Model 165
configuration, includ1ng the presence of any new I/O devices or
features" such as the 3211 Printer, the 3330 and 2305 facilities,
an integrated emulator program, etc. Other control program options,
such as I/O RMS, OLTEP, and performance improvement features, can
be included. MCS and DIDOCS must be requested to support the CRT
and keyboard as an operator's console.
• FCB and UCB images should be added to SYS1.SVCLIB if a 3211 Printer
is included in the configuration. User-written output writer
procedures should be modified to include these specifications.
The OS MFT or MVT operating system generated for the Model 165
includes the following:
• A nucleus designed to operate in the fixed storage area of the
Model 165. RMS routines (MCH and CCH) that support the expanded
machine check interrupt are included. OBR and SDR are present
also.
• Control program support of block multiplexing, and rotational
position sensing as discussed in Section 30, if requested
• Support of the user-specified new I/O devices and Model 165 operator
console
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IBM System/370 Specifications

General

Brand	IBM
Model	System/370
Category	Server
Language	English