Draft Document for Review April 7, 2004 6:15 pm

6947ch06.fm

￿z/OS with Compatibility support must be IPLd in a partition that has an LPAR identifier in the range 0-F. If the LPAR identifier is outside of this range, then z/OS will terminate with a 07C-02 wait state.

￿Dynamic activates for hardware changes can only be done for LCSS 0. A Power-on Reset is required for changes to other Logical Channel Subsystems. Dynamic activate for hardware changes within LCSS 0 cannot be done if the resource is also defined in any other LCSS. For example, if a DASD control unit has connections to LCSS 1, 2, or 3 then additional connections cannot be added to LCSS 0 dynamically while in Compatibility mode. Software activates can be done regardless of the number of LCSSs defined.

z/OS V1.4 z990 Compatibility Support feature

The Compatibility Support feature is an optional unpriced orderable feature that is required to allow z/OS Version 1 Release 4 to run on a z990. It offers the capability to execute on the hardware in a way that is compatible with earlier processor models, but without exploitation of new functions, although some new features (such as the increased number of HiperSockets) can be used. z/OS Version. This feature is no longer orderable and is replaced by the z/OS V1.4 z990 Exploitation Support feature since February 24, 2004.

6.2.2 Exploitation support for z/OS

Exploitation support for the z990 is delivered for z/OS V1.4. Follow-on z/OS releases will have Exploitation support included. For z/OS V1.4 it is shipped as a separately orderable feature.

z/OS Exploitation support allows:

￿z/OS to run in a partition defined to any Logical Channel Subsystem

￿z/OS to run in a partition with an LPAR identifier greater than x’F’.

￿z/OS dynamic activates for hardware changes to any Logical Channel Subsystem.

z/OS V1.4 z990 Exploitation Support feature

The Exploitation Support feature is an optional unpriced orderable feature that provides exploitation support for two Logical Channel Subsystems and 30 logical partitions. This is a mandatory feature when ordering z/OS V1.4 as of February 24, 2004.

Other exploitation items are:

￿Dynamic I/O support to dynamically add, change, and delete channel paths, control units, and devices in multiple Logical Channel Subsystems

￿Up to four Logical Channel Subsystems, with HCD PTFs

￿External spanned channels

z/OS V1.5 Support

Exploitation Support (and compatibility support) is integrated into the base of z/OS V1.5 and later releases. Exploitation support in z/OS V1.5 offers:

￿Up to 30 Logical Partitions

￿Up to four Logical Channel Subsystems, with HCD PTFs

Planned z/OS V1.6 support

Exploitation Support (and compatibility support) is integrated into the base of z/OS V1.6 (planned to be available in September 2004). Some unique support offered by this release is:

￿Dynamic addition and deletion of a logical partition name.

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IBM manual Exploitation support for z/OS, OS V1.4 z990 Compatibility Support feature, OS V1.5 Support
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990 specifications

The IBM 990 series, often referred to in the context of IBM's pioneering efforts in the realm of mainframe computing, represents a unique chapter in the history of information technology. Introduced in the late 1960s, the IBM 990 series was designed as a powerful tool for enterprise-level data processing and scientific calculations, showcasing the company's commitment to advancing computing capabilities.

One of the main features of the IBM 990 was its architecture, which was built to support a wide range of applications, from business processing to complex scientific computations. The system employed a 32-bit word length, which was advanced for its time, allowing for more flexible and efficient data handling. CPUs in the IBM 990 series supported multiple instructions per cycle, which contributed significantly to the overall efficiency and processing power of the machines.

The technology behind the IBM 990 was also notable for its use of solid-state technology. This provided a shift away from vacuum tube systems that were prevalent in earlier computing systems, enhancing the reliability and longevity of the hardware. The IBM 990 series utilized core memory, which was faster and more reliable than the magnetic drum memory systems that had been standard up to that point.

Another defining characteristic of the IBM 990 was its extensibility. Organizations could configure the machine to suit their specific needs by adding memory, storage, and peripheral devices as required. This modular approach facilitated the growth of systems alongside the technological and operational demands of the business environments they served.

In terms of software, the IBM 990 series was compatible with a variety of operating systems and programming environments, including FORTRAN and COBOL, enabling users to access a broader array of applications. This versatility was a significant advantage, making the IBM 990 an appealing choice for educational institutions, research facilities, and enterprises alike.

Moreover, the IBM 990 was engineered to support multiprocessing, which allowed multiple processes to run simultaneously, further increasing its effectiveness in tackling complex computing tasks.

In summary, the IBM 990 series represents a significant advancement in computing technology during the late 20th century. With a robust architecture, versatile configuration options, and a focus on solid-state technology, the IBM 990 facilitated substantial improvements in data processing capabilities, making it a cornerstone for many businesses and academic institutions of its time. Its impact can still be seen today in the continued evolution of mainframe computing.
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