Configurations (processors)
Processors VM/370 supports the following processors: IBM System/370 Model 135 Submodel 3 IBM System/370 Model 138 IBM System/370 Model 145 IBM System/370 Model 145 Submodel 3 IBM System/370 Model 148 IBM System/370 Model 155 II IBM System/370 Model 158 UP/I\P/MP1 IBM System/370 Model 158 Submodel 3 IBM System/370 Model 165 II IBM System/370 Model 168 UP/AP/t!pt IBt! System/370 Model 168 Submodel 3 IBM 4331 processor IBM 4341 processor IBM 3031 processor UP/AP IBM 3032 processor UP IBM 3033 processor UP/AP/Mpa PROCESSOR REQUIRED FEATURES AND FACILITIES The processor features and facilities required by VM/370 are listed
below. Only the features and facilities that are not standard on a
particular processor are described. For example, the Word Buffer
feature is standard only on the t!odel 148; therefore, the feature number
and requirements are described only for the Models 145 and 145-3. The System Timing facility (12001), which includes the clock
comparator and the processor timer, on the Models 135 and 145. The clock comparator and processor timer (12001) on the Model 145-3. The Floating-point feature
--For the Model 135, feature #3900 --For the Model 145, feature #3910 The Precision Floating feature (13840) on the Model 135-3. The Channel Indirect Data Addressing feature on each of the 2860, 28 7 0, and 2880 standalone I/O channels on the Model 165 II or 168.
--For the 2860, features 11861, 1862, and 1863
--For the 2870, feature 11861 --For the 2880, features 11861 and 1862
1This System/370 model is supported when running in uniprocessor mode or
with an asymmetric IIO configuration. In an asymmetric configuration,
all I/O devices attached to the system must be attached to one
processor. 106 IBM VM/370 Planning and System Generation Guide
April 1, 1981
Configurations (Processors)
Note: The standalone channels that attach to the System/370 Kodels 165 II and 168 require that the Channel Indirect Data Addressing
feature be ordered as a separate featur'e for proper operation of the
input/output channels in a Dynamic Address Translation environment. The Word Buffer feature (#8810) is required on the System/370 Kodel 145-3. It is also required on the Model 145 if:
--A 2305 Model 2 Fixed Head Storage device is attached.
--A 3340, 3344, or 3350 Direct Access storage Facility attached.
--A 3330 configuration includes an Integrated File Adapter and two Selector channels, or three or more Selector channels. This feature is also recommended for selector channels if 2314, 3330, 3340, or 3350 devices are attached. DESIRABLE FEATURES The following processor features are desirable for VK/370: virtual machine assist improves the performance of VK/370 systems
that run virtual storage operating systems in virtual machines. The
manner in which virtual machine assist and VK/370:ECPS (see below)
are supported on the various VM/370 processors is detailed under "Using the Performance Options.1! Extended Control -Program Support improves the performance of VM/370 through CP assist and expanded virtual machine assist capabilities. The Extended Floating-point feature, although not required, improves
the execution of programs that use Extended Floating-point
instructions under VM/370 on Models 135, 155 II, and 158.
--For the Model 135, feature #3840 --For the Model 155 II, feature #3700 --For the Model 158, feature #3700 The APL Assist feature provides performance assistance when used with
the VS APL program producte It is available as hardware feature #1005 on the System/370 Models 135 and 145. The Conditional Swapping feature provides additional instructions
required for the execution of VTAM proqrams. It is available as
feature #1051 on the System/370 Models 135 and 145. The Advanced Control Program Support feature is available only on the System/370 Model 145 as feature '1001. It provides additional
instructions required for the execution of KVS (OS/VS2 Release 2 and
above) and/or VTAM. Note: The Conditional Swapping feature and the Advanced Control
Program Support feature are mutually exclusive.
Part 1. Planning for System Generation 107
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