Aug. 1, 1979
12 and 16 Megabyte Real Storage Capability VM/370 supports the 3033 processor whose available processor storage
capability is 12 and 16 megabytes. The support of this increased
available processor storage capacity requires no code changes to VM/370. Section 1. Summary of Changes to the VM/370 System 1-3

Page of GC20-1834-0 As Updated Aug. 1, 1979 by TNL GN25-0486
4331 and 4341 Processor Support
The IBM 4300 processors, supported by this release, combine System/370 compatibility with large scale integration (LSI) technology.
The 4331 processor offers processor storage and high speed control
storage to accomodate standard functions as well as control storage
capability required by optional features. Current System/370 users and
new customers can now use interactive and data base/data communications
applications. One half megabyte of processor storage is standard on the
4331 with the option of expanding to one megabyte. A wide variety of
current I/O devices can be attached to the 4331 processor in addition to
new I/O devices that are supported when the VM/370 Basic System Extensions Program Product is installed.
The 4341 processor also offers virtual storage and SCP support with System/370 compatibility. This processor has versatility in
applications usage as a commercial, scientific, data acquisition,
teleprocessing, or general purpose system. As with the 4331, the 4341
can also use a wide variety of currently available I/O devices, tape
units, and display units in addition to the new devices that function
only when the installation is running with the VM/370 Basic System Extensions Program Product. Two megabytes of processor storage are
standard on the 4341 with the option of expanding to four megabytes.
Release 6 of VM/370 is compatible with ECPS:VM/370 Level 19
4331 and 4341 processors. This support is included in the
shipment of these processors.
on the
initial
No fixed or I/O extended machine check logout area and no fixed or I/O extended channel check logout area exist for the 4331 and 4341 and
no region code (model dependent information) is available. Independent
machine checks and channel checks are recorded as they are now. If any
dependent machine or channel check occurs, it is recorded on diskette
which only customer authorized service personnel can access using a
standalone program.
The 3278 Model 2A display station is used as the system console for
the 4331 and 4341 processors. The 3278 Model 2A is supported the same
as a 3277 with the following differences for the new display station: • Screen layout differences. 20 lines (80 25- line display are used for operator
recognize the smaller screen size. 1-U IBM VM/370 Release 6 Guide
characters per line) of the
communication. CP and CMS