Sap

6947IX.fm

QDIO 102

Redbooks Web site 252 Contact us xii

refrigeration 25

Reliability, Availability, Serviceability (RAS) 18 Reserved Processors 51

Reserved storage 70 Ring Topology 29

riple length- key DES 120 RMF support 141

RPQ 8P2197 104 RSA 120

SAP	6, 50
SC chip		35–36
SD chip		30, 36
SE	66, 112, 235
Self Timed Interconnects 39
Self Timed Interface				180
Self-Timed Interconnect					6
Service Element 34
Simplified I/O definition					180
Software model MSU values 65
Software support 20
SSL	43
STI	6, 39, 77
STI connector			31, 78
STI extender card 34, 41
STI link		81
STI links		8
STI Rebalance feature					79, 81, 88, 187, 189, 208
STI-2 Extender card				79
STI-3 Extender card				79
STI-M card 76
Storage
granularity			70
storage
CF mode			69
ESA/390 architecture mode 69
ESA/390 mode				68
expanded			55
Linux Only mode				69
operations			67
reserved			70
TPF mode			69
z/Architecture mode					69
STSI instruction 63
superscalar 24, 42, 220
Superscalar processor					41

Support Element 66, 112, 235 System Assist Processor 50 system memory 6

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

TDES 120

Token Ring 12

TPF 146

Trusted Key Entry 123

UDX 121

unassigned CP 62, 64 unassigned IFL 62, 64 uniprocessor speed 178 Unplanned upgrades 188 Upgrade paths 63 upgrades 215–216 UPID 112

User Logical Partition ID 112

VSE/ESA 146

WLM 181–182 goals 178

Workload License Charge 21 Workload Manager (WLM) 15

Z frame 34

z/Architecture mode 69
z/VM	47, 145
z/VSE	146
z/VSE and VSE/ESA software support		146
z990
frames 33
z990 models
configuration 61
zAAP	6, 49, 62, 64, 138, 212
zSeries Application Assist Processors		49

266IBM 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 Sap

Models: 990

6947IX.fm

SSL

STI

VSE/ESA 146

990 specifications