Summary of Changes
Summary of Changes
for SC19-6203-2 for VM/SP Release 3
Programmable Operator Facility Several enhancements to the programmable operator facility added are:
Message routing with nicknames
Remote node availability
Enhanced text comparison
EXEC action routines • LOG recording and error handling
PER
Problem determination capability is greatly extended and enhanced by the new
CP command, PER.
DASD Block I/O System Service
The DASD block I/O system service allows a virtual machine fast,
device-independent asynchronous access to fixed size blocks on CMS format­
ted virtual DASD I/O devices.
IUCV Inter-User Communication Vehicle (IUCV) extensions provide: SEND and REPLY extensions
An extended mask capability for control interrupts
An expanded trace capability to record all IUCV operations
A macro option to initialize the parameter list Support for the DASD block I/O system service.
The IBM 3088 Multisystem Communications Unit
The IBM 3088 Multisystem Communications Unit interconnects multiple sys­
tems using block multiplexer channels. The 3088 uses an unshared sub channel
for each unique address and is fully compatible with existing
channel-to-channel adapter protocol. Summary of Changes iii

CMS IUCV support
Support for IUCV communication has been introduced into CMS. This sup­
port allows multiple programs within a virtual machine to use IUCV functions.
Included is the ability to initialize a CMS machine for IUCV communication
and to invoke IUCV functions via new CMS macros. These macros also allow
the user to specify path-specific exits for IUCV external interrupts.
CMS ABEND exits
A general CMS abnormal exit capability is provided so that user programs may
specify the address of a routine to get control before CMS ABEND recovery
begins. An exit is established and cleared through a new CMS macro.
Enhanced immediate command support.
The immediate command capability of CMS is extended by allowing users to
define their own immediate commands.
Enhanced VSAMsupport
CMS supports VSE/VSAM Release 3 which includes significant enhancements
designed to improve catalog reliability and integrity while providing additional
serviceability and usability. VSE/VSAM Release 2 is not supported.
Miscellaneous
iv VM/SP System Programmer's Guide
Changes to the DIAGNOSE zero interface provide the time zone differential
from Greenwich Mean Time.
DIAGNOSE X'8C' allows a virtual machine to access device dependent infor­
mation without having to issue a WRITE STRUCTURE FIELD QUERY REPLY. CMSSEG has been eliminated and the code was merged into the CMS
Nucleus.
The Remote Spooling Communications Subsystem (RSCS) section of this
manual has been removed as it pertained to RSCS as a component of VM/370. Now, any reference to RSCS in this manual applies to the RSCS
Networking Programming Product, and information can be found in the
VM / SP Remote Spooling Communications Subsystem Networking Program Ref­
erence and Operations Manual, SH24-5005. A newly added appendix lists and describes the CMS macros applicable to VM/SP. Minor technical and editorial changes have been made throughout this publica­
tion.