6947ch02.fm

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

Table 2-6 z990 software models

z990 Models

Software

 

Models

 

 

IBM 2084-A08

301 - 308

 

 

IBM 2084-B16

301 - 316

 

 

IBM 2084-C24

301 - 324

 

 

IBM 2084-D32

301 - 332

 

 

Note: Software model number 300 is used for IFL or ICF only models.

This structure enables a different approach to downgrading the system in cases where a larger system is installed on which, for software charging reasons, temporarily less CP capacity must be assigned. It is now possible (with the use of the IBM internal e-Config tool) to order a simultaneous downgrade.

Consider, for example, an IBM 2084-A08 ordered with six PUs for customer use. Feature code (F/C 0716) specifies the number of PUs characterized as CPs (assume 4), and a different feature code (F/C 1716) specifies the number unassigned CPs (assume 2). The unassigned CPs are part of the order, but cannot be used and will not be charged for MLC software charges. Later, when the capacity need requires it, the unassigned CPs can be assigned and will become active assigned CPs.

An unassigned CP is a PU that is purchased as a CP, but is not active in the model configuration. An unassigned IFL is a PU that is purchased as an IFL, but is not active in the current model configuration.

A minimum of one PU characterized as a CP, IFL, or ICF is required per system. PUs can be characterized as CPs, IFLs, ICFs, or zAAPs. The maximum number of CPs is 32, the maximum number of IFLs is 32, and the maximum number of ICFs is 16, and the maximum number of zAAPs amounts to 16 (up to 4 zAAPs per book). Not all PUs available on a model are required to be characterized as a CP, IFL, ICF, or zAAP. Only purchased PUs are identified by a feature code.

Feature codes related to CPs and unassigned CPs, IFLs and unassigned IFLs, ICFs, SAPs, and zAAPs are:

￿Feature code 0716 for a CP

￿Feature code 1716 for an unassigned CP

￿Feature code 0516 for an IFL

￿Feature code 0517 for an unassigned IFL

￿Feature code 0518 for an ICF

￿Feature code 0519 for an optional SAP

￿Feature code 0520 for a zAAP

PU conversions

Assigned CPs, unassigned CPs, assigned IFLs, unassigned IFLs, and ICFs may be converted to other assigned, or unassigned feature codes. Valid conversion paths are:

￿Conversion of feature code 0716 to 1716, 0516 or 0518 for conversion of a CP to an unassigned CP, an IFL or an ICF

￿Conversion of feature code 1716 to 0716, for conversion of an unassigned CP to a CP

￿Conversion of feature code 0516 to 0517, 0518 or 0716, for conversion of an IFL to an unassigned IFL, an ICF or a CP

64IBM eServer zSeries 990 Technical Guide

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IBM manual PU conversions, Z990 Models Software
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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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