IBM 990 - Manual (Page 32)

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zSeries 990 Technical Guide
OS/390 and z/OS
OS/390 R10 and z/OS 1.2 to z/OS 1.5 and later all provide Compatibility support. In addition,
z/OS 1.4, and z/OS 1.5 or later will have Exploitation support for up to 30 logical partitions
and four LCSSs. OS/390 supports both 31-bit and 64-bit modes, while z/OS 1.2 to z/OS 1.4
have the bimodal migration accommodation available for fallback to 31-bit mode for a period
of up to 6 months.
Exploitation support can be installed on any z/OS 1.4 system, regardless of the hardware it is
running on, but obviously uses functionality as provided by that hardware. The Exploitation
support is include on z/OS 1.5 and later releases.
When z/OS or OS/390 has only Compatibility support applied, it is limited to running in
LCSS0 and may not have an LPAR ID greater than 'F'. In a z/OS only environment, if z/OS
does not have exploitation support, then it is limited to only 15 active logical partitions and up
to 256 CHPIDs. More partitions may be defined and may be physically installed, but they
cannot be used.
With Exploitation support on z/OS 1.4 or later, it is possible to fully exploit the z990
capabilities. It is possible to define up to 4 LCSS with up to 256 CHPIDs in each. Up to 30
logical partitions may be defined across the 4 LCSS. z/OS 1.5 has Exploitation support
delivered as part of the base function, but does not support 31-bit mode on z990.
Linux
Linux for S/390 is available in 31-bit mode and will support Exploitation mode. Linux on
zSeries is available in 64-bit mode and will support Exploitation mode.
z/VM
All versions of z/VM support both 31-bit and 64-bit mode.
z/VM 4.4 and z/VM 5.1 and later are capable of exploiting up to 30 logical partitions and up to
four LCSSs. VM/ESA® is not supported on z990.
z/VSE
z/VSE Version 3.1 supports 31-bit mode only and Exploitation mode.
VSE/ESA™
VSE/ESA Versions 2.6 and 2.7 will support z990 with the appropriate maintenance.
TPF
TPF V4R1 is supported in 31-bit mode with Compatibility. TPF does not provide Exploitation
support.
Software pricing
The z990 product line qualifies for the same software pricing structure and software terms
and conditions that are currently available for the z900 and zSeries servers. Workload
License Charge (WLC) pricing is available when z/OS is running on the z990 server and all
other qualifying terms and conditions for WLC are met. WLC pricing is enhanced on the
variable charge products to provide greater granularity on z900 and z990 through lowering
the base charge from 45 MSUs to 3 MSUs.
Note: z/OS 1.1 is not supported on z990 or on any zSeries server participating in a
sysplex that includes a z990 server.