Section 70: Programming Systems Support; 70:05 Dos/Vse - IBM 4381 Manual

Section 70: Programming Systems Support
Model Groups 11, 12, 13, 1, and 2 of the 4381 Processor support operating
systems that use a 2K or 4K page size. For configurations with up to 16Mb of
processor storage, operating systems that use a 2K or 4K storage protect key are
supported. For a 4381 Model Group 12, 13, or 2 with more than 16Mb, an
operating system that supports 4K protect keys
is
required.
The 4381 Processor Model Group 14 or 3 supports operating systems that use a 4K
page size only. Thus, if a Model Group 14 or 3 is initialized as a uniprocessor,
DOS/VSE can be run only if VSE/ Advanced Functions Release 2.1.1 is used,
since the latter supports 4K keys, and OS/VSl cannot be run.
70:05 DOS/VSE
DOS/VSE with VSE/ Advanced Functions (VSE/ AF) as of Release 1.3.5 and
VSE/SP as of Release 1.3.5 supports 4381 Model Group 11, 12, 13, 1, and 2
Processors operating in System/370 mode with up to 8Mb of processor storage.
DOS/VSE with VSE/ AF Release 1.3.5 and VSE/SP 1.3.5 can execute in a
uniprocessor 4381 Processor with 16Mb of processor storage but can use a
maximum of only 8Mb. When the VM Linkage Enhancements of VSE/ AF is
specified, a DOS/VSE system executing in a virtual machine can use up to 16Mb
of processor storage. When VSE/ AF Release 2.1.0 is used with DOS/VSE, up to
16Mb of processor storage is supported. VSE/ AF Release 1.3.5 or 2.1.0 supports
only 2K pages, while VSE/ AF Release 2.1.1 supports 4K pages.
VSE/ AF as of Release 1.3.5 provides support of fixed block architecture (FBA)
devices (3370 for 4381 Processors) for System/370 mode supervisors (rather than
for ECPS:VSE mode supervisors only). It also uses the SIOF instruction and
supports SIOF queuing by processing deferred condition 1 interruptions. In
addition, this release permits up to 16Mb of virtual storage (less supervisor and any
real partition requirements) to be used regardless of the size of real storage and
supports additional I/ 0 devices.
Two DOS/VSE to MVS migration aids (program offerings) are available. The
UCC Two (DOS/VSE to MVS Migration Aid) adapts DOS/VSE executable code
(DOS/VSE Core Image Library modules) to operate under MVS. The adapted
DOS/VSE modules reside in an MVS load module library and operate under MVS
using MVS job control statements and MVS data sets (DOS/VSE files must be
converted to MVS data sets). The VSE JCL Conversion Aid can be used to
convert DOS/VSE job control statements to MVS job control statements.
Section 70: Programming Systems Support
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