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

l'age or: AS I, DJ "!"ftL l:ift-":>-VO",' configurations (I/O) Direct Access Storage Devices
The following direct access storage devices and control units are
supported by VM/370. The direct access storage devices sUpported by VM/370 are: ,. IBM 2305 Fixed Head Storage, Models 1 and 2. , • IBM 2314 Direct Access Storage Facility. • IBM 2319 Disk storage. • IBM 3330 Disk Storage, Models 1, 2, and 11. • IBM 3333 Disk Storage and Control, Models 1 and 11. • IBM 3340 Direct Access Storage Facility, Models A2, B1, and B2; the 3348 Data 35, 70, and 7Cr; and the 3344 Direct Acc€sz Storage, Model B2. • IBM 3350 Direct Access Storage, Models A2 and B2.
All of these direct access devices are supported as VM/370 system
residence, paging and spooling devices and as virtual devices for use by
virtual machines. All are supported as dedicated devices. All except
the 2305 are supported by CMS. The following direct access control units are supported by VM/370: • IBM 3345 Storage and Control Frame Models 3, 4, and 5 on the Models
145, 145-3, and 148 with the standard ISC for: --3330 Models 1 and 2
--3333 Models 1 and 11 --3340 Model A2 and 3344 Model B2 --3350 Model A2 • IBM 2835 Storage Control Model 1 for 2305 Model 1. • IBM 2835 Storage Control Model 2 for 2305 Model 2. • IBM 2844 Auxiliary Storage Control for 2314 and 2319. • IBM 3830 Storage Control Model 1 for 3330 Models 1 and 2 only. • IBM 3830 Storage Control Model 2 for 3333 Models 1 and 11 , 3340 Model A2, and 3350 Model A2. • IBM 3830 Storage Control Model 3 for 3330 Models 1 and 11, and 3333
Models 1 and 11. • IBM 3880 Storage Control Model 1 for 3330 Models 1, 2, and 11, 3333
Models 1 and 11, and 3350 Models A2 and A2F. • IBM Integrated File Adapter (#4650) on System/370 Models 135 and 145
for 2319. 108 IBM VM/370 Planning and System Generation Guide