CEC cage book Pchid numbers | IBM 990 specification

6947ch03.fm

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

			PCHID numbers
I/O cage slot
I/O cage slot	1st I/O cage		2nd I/O cage		3rd I/O cage
	1st I/O cage		2nd I/O cage		3rd I/O cage

12 (front)	1A0	- 1AF	3A0	- 3AF	5A0	- 5AF

13 (front)	1B0	- 1BF	3B0	- 3BF	5B0	- 5BF

15 (front)	1C0	- 1CF	3C0	- 3CF	5C0	- 5CF

16 (front)	1D0	- 1DF	3D0	- 3DF	5D0	- 5DF

17 (front)	1E0	- 1EF	3E0	- 3EF	5E0	- 5EF

18 (front)	1F0	- 1FF	3F0	- 3FF	5F0	- 5FF

19 (rear)	200	- 20F	400	- 40F	600	- 60F

20 (rear)	210	- 21F	410	- 41F	610	- 61F

21 (rear)	220	- 22F	420	- 42F	620	- 62F

22 (rear)	230	- 23F	430	- 43F	630	- 63F

24 (rear)	240	- 24F	440	- 44F	640	- 64F

25 (rear)	250	- 25F	450	- 45F	650	- 65F

26 (rear)	260	- 26F	460	- 46F	660	- 66F

27 (rear)	270	- 27F	470	- 47F	670	- 67F

29 (rear)	280	- 28F	480	- 48F	680	- 68F

30 (rear)	290	- 29F	490	- 49F	690	- 69F

31 (rear)	2A0	- 2AF	4A0	- 4AF	6A0	- 6AF

32 (rear)	2B0	- 2BF	4B0	- 4BF	6B0	- 6BF

Note that I/O cage slot numbers 05, 14, 23, and 28 are reserved for eSTI-M cards.

The PCHID number range from 000 to 0FF is reserved for ICB-4 links. As ICB-4 links are directly connected to a book, Table 3-6 shows the ICB-4 PCHID numbers range for each book.

Table 3-6 PCHID numbers for ICB-4 links

CEC cage book	PCHID numbers

0	010 - 01B

1	020 - 02B

2	030 - 03B

3	000 - 00B

Important: If the STI Rebalance feature (Feature Code 2400) is selected on a z990 server upgrade, the current ICB-4 PCHID numbers may change. This requires the corresponding update of the ICB-4 link definition in the z990 server I/O configuration.

The server’s PCHID Report has all installed PCHID numbers. At definition time, PCHIDs are assigned to Channel Path IDs (CHPIDs) using the CHPID Mapping Tool, or HCD/HCM, or

88IBM eServer zSeries 990 Technical Guide

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.

IBM 990 manual CEC cage book Pchid numbers

Models: 990

CEC cage book

PCHID numbers

990 specifications