Section 8. Maintaining Compatibility with
Supported Hardware and Software
This section defines updates that must be made to hardware products and
to programs to ensure that these hardware products and programs remain compatible with this release of VM/370. VM/370 ECPS Compatibility
1. The Extended Control program Support (fCPS) installed in the 4331
and 4341 Frccessors wust be VM/370 Release 6 level. on the 4331 is a subset of that provided on the 4341. The ECPS:VM/370 and the ECPS:VS1 are mutually exclusive on the 4341.
The ECPS:VS1 is not available on the 4331.
2. Release 6 of VM/370 is compatible with ECPS:VM/370 Level 18 on the
135-3, 138, 145-3, and 148 processors. The appropriate ECPS:VM/370 support is provided by the following ECs: • ECi 149136 and later for the 135-3 processor • ECt 149136 and later for the 138 processor • BCt 356901 and later for the processor • ECt 147710 and later for the 148 processor VM/370 Release 6 executes on these System/37C processors at other
earlier EC levels, but the hardware assist is not used.
Programs Utilizing Protected Shared Segments Programs utilizing protected shared segments must not make changes to
these segments and expect the changes to be preserved. If the control program encounters a change in a protected shared segment, the
changed page is returned to free storage and the violator is placed in
console functicn mode. Spool File Incompatibility A Release 6 VM/370 system containing spool files created by VM/370 Release 5 cannot be WARM started. The new Release VM/370 system must te COLD started.
, i IThere are no other known compatibility problemsl Ibetween VM/370 Release 6 and other supported ! Iprcgrams and hardware products. I Section 8. Maintaining Compatibility with Eardware/Software 8-1

8-2 IBM VM/370 Release 6 Guide