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

6947ch03.fm

Machine: 2084-A08 NEW1

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Book/Jack/MBA

Cage

Slot

F/C

PCHID/Ports

Comment

0/J.00/0

A01B

D101

0218

100/J00

101/J01

 

0/J.08/2

A01B

D102

0218

110/J00

111/J01

 

0/J.00/0

A01B

03

1364

120/J00

121/J01

 

0/J.08/2

A01B

04

2319

130/J00

131/J01

 

Legend:

A19B Top of A frame A01B Bottom of A frame

D1xx Half high card in top of slot xx 0218 ISC D <10KM

1364 OSA Express GbE LX

2319 FICON Express LX

Figure 3-9 PCHID Report example

I/O slot 01 has an ISC-3 Daughter (ISC-D) half-high card (FC 0218) in the top, connected to STI 0 (Jack J.00) from MBA 0 of book 0. Its two enabled ports have PCHID numbers 100 and 101.

I/O slot 04 has a FICON Express LX card (FC 2319), connected to STI 8 (Jack J.08) from MBA 2 of book 0, and its two ports have PCHID numbers 130 and 131.

The pre-assigned PCHID number of each I/O port relates directly to its physical location (jack location in a specific slot), except for ESCON sparing; refer to Figure 3-11 on page 95 for an ESCON sparing example.

Table 3-5 shows the PCHID numbers range for each I/O slot of each I/O cage.

Table 3-5 PCHID numbers and locations

 

 

PCHID numbers

 

I/O cage slot

 

 

 

1st I/O cage

2nd I/O cage

3rd I/O cage

 

 

 

 

 

01 (front)

100 - 10F

300 - 30F

500 - 50F

 

 

 

 

02 (front)

110 - 11F

310 - 31F

510 - 51F

 

 

 

 

03 (front)

120 - 12F

320 - 32F

520 - 52F

 

 

 

 

04 (front)

130 - 13F

330 - 33F

530 - 53F

 

 

 

 

06 (front)

140 - 14F

340 - 34F

540 - 54F

 

 

 

 

07 (front)

150 - 15F

350 - 35F

550 - 55F

 

 

 

 

08 (front)

160 - 16F

360 - 36F

560 - 56F

 

 

 

 

09 (front)

170 - 17F

370 - 37F

570 - 57F

 

 

 

 

10 (front)

180 - 18F

380 - 38F

580 - 58F

 

 

 

 

11 (front)

190 - 19F

390 - 39F

590 - 59F

 

 

 

 

Chapter 3. I/O system structure

87

Page 100 Page 102
Page 101
Image 101
IBM 990 manual Pchid Report example
Page 100 Page 102

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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