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

6947ch06.fm

D M=CPU

 

 

IEE174I 14.45.55 DISPLAY M 159

PROCESSOR STATUS

ID

CPU

 

SERIAL

0

+

 

1293052084

1

+

 

1293052084

2

+

 

1293052084

CPC

ND

= 002084.R01.IBM.02.000000049305

CPC

SI

= 2084.R01.IBM.02.0000000000049305

CPC

ID

= 00

CPC

NAME = XXXXXXXX

LP NAME = SC66, LP ID = 12

CSS ID

 

= 1

MIF ID

 

= D

+ ONLINE

- OFFLINE . DOES NOT EXIST

CPC ND

 

CENTRAL PROCESSING COMPLEX NODE DESCRIPTOR

CPC SI

 

SYSTEM INFORMATION FROM STSI INSTRUCTION

CPC ID

 

CENTRAL PROCESSING COMPLEX IDENTIFIER

CPC NAME

CENTRAL PROCESSING COMPLEX NAME...

 

 

 

 

Figure 6-4 D M=CPU command output

The output from the D IOS,CONFIG(HSA) and D IOS,CONFIG(ALL) commands no longer has references to SHARED and UNSHARED control units. Previously this command would have been used to determine the HSA space available for dynamically adding control units and I/O devices. On the z990 processor, the number of additional devices that can be added dynamically is determined by the MAXDEV value associated with each LCSS. This parameter is specified via HCD and is set in the IOCDS. The new output from the D IOS command is shown in Figure 6-5.

D IOS,CONFIG(HSA)

 

 

IOS506I hh.mm.ss

I/O CONFIG DATA

 

HARDWARE

SYSTEM AREA AVAILABLE FOR CONFIGURATION CHANGES

PHYSICAL

CONTROL

UNITS

50

CSS

0 -

LOGICAL

CONTROL UNITS

100

SUBCHANNELS

 

2000

CSS

1 -

LOGICAL

CONTROL UNITS

120

SUBCHANNELS

 

3240

Figure 6-5 Output from the Display IOS command on z990

The IEE174I, IOS050I and IOS051I messages display not only the CHPID number, but also the associated PCHID. This addition assists IBM service representatives and operations staff with the diagnosis of hardware problems. The new output is shown in Figure 6-6.

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IBM 990 manual D M=CPU command output
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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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