6947ch03.fm

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

Cryptographic Coprocessor Facility used by known applications have also been implemented in the PCIXCC feature.

3.3.3 Physical Channel IDs (PCHIDs)

A Physical Channel ID (PCHID) is the number assigned to a port of an I/O or cryptographic card. Each enabled port has its own PCHID number, which is based on its I/O slot location in the I/O cage (except for ESCON sparing).

In the case of an ICB-4 link, its PCHID number is based on its CEC cage location.

Figure 3-8 on page 86 shows the rear view of the first I/O cage (bottom of the A frame), including some I/O cards in slots 01 to 05, and the PCHID numbers of each port.

 

 

I/O Cage 1 - Front

I/O Cards

ISC-3

ISC-3 OSA-E FICON STI-M

 

 

 

 

 

100

110

 

 

 

I/O Ports

 

 

 

 

 

120

 

 

101

111

130

...

 

 

 

 

 

 

 

 

 

STI-M

PCHIDs

 

 

 

 

 

 

 

 

121

131

 

I/O Slots

01

02

03

04

05 ...

Figure 3-8 Physical Channel IDs (PCHIDs)

Figure 3-9contains the corresponding PCHID Report of the configuration example shown in Figure 3-8.

86IBM eServer zSeries 990 Technical Guide

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IBM 990 manual Physical Channel IDs PCHIDs, PCHIDs 121 131 Slots
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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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