/XRL/21

D100016

2043CH10

 

 

 

230

(1)

POWER/JES2 detailed comparisons

 

 

(2)

exit comparisons

 

 

 

231, 231

D100017

2043CH10

 

 

 

231

(1)

POWER/JES2 detailed comparisons

 

 

(2)

POWER/JES2 command equivalences

 

 

 

232, 232, 233, 233, 233, 234, 234

D110001

2043CH11

 

 

 

235

(1)

introducing PSF/MVS

 

 

(2)

functional comparison

 

 

 

235, 235, 235

D110003

2043CH11

 

 

 

236

(1)

installing & configuring PSF/MVS

 

 

(2)

defining channel-attached printers to MVS

 

 

 

236

D110004

2043CH11

 

 

 

236

(1)

installing & configuring PSF/MVS

 

 

(2)

defining network printers

 

 

 

236, 237

D110007

2043CH11

 

 

 

238

(1)

installing & configuring PSF/MVS

 

 

(2)

FSS procedure and PRINTDEV statements

 

 

 

238

D110008

2043CH11

 

 

 

240

(1)

setting up AFP resources

 

 

(2)

migrating resources from VSE to OS/390

 

 

 

240, 240

D110011

2043CH11

 

 

 

241

(1)

setting up AFP resources

 

 

(2)

migrating print applications

 

 

 

241, 241, 241, 241, 242, 242, 242, 242, 242

D110021

2043CH11

 

 

 

244

(1)

PSF/MVS references

 

 

(2)

tools

 

 

 

244, 244, 244, 245

D120010

2043CH12

 

 

 

256

(1)

DOS/VS COBOL & COBOL for OS/390 and VM language

 

 

differences

 

 

(2)

PROCEDURE DIVISION - Input/Output

 

 

 

257

D120011

2043CH12

 

 

 

257

(1)

DOS/VS COBOL & COBOL for OS/390 and VM language

 

 

differences

 

 

(2)

file handling considerations

 

 

 

257, 258, 258

D130001

2043CH13

 

 

 

268

(1)

Assembler Products

 

 

(2)

system interface & macros

 

 

 

269, 269, 269, 270, 271, 274, 274, 275, 275, 275, 275,

 

 

 

276, 277, 277, 278, 278, 278, 278, 279, 280, 281, 281,

 

 

 

281, 282

D130002

2043CH13

 

 

 

283

(1)

Assembler Products

 

 

(2)

multitasking macros

 

 

 

283, 284, 285, 286

D130003

2043CH13

 

 

 

287

(1)

Assembler Products

 

 

(2)

interrupt handling routines

 

 

 

287, 287, 288, 288, 288

D130004

2043CH13

 

 

 

289

(1)

Assembler Products

 

 

(2)

virtual storage macros

 

 

 

289, 290, 290, 290, 290, 290

D130005

2043CH13

 

 

 

290

(1)

Assembler Products

 

 

(2)

VSAM macros

 

 

 

290, 290, 291, 291, 292, 292, 292, 292, 292

D130006

2043CH13

 

 

 

292

(1)

Assembler Products

 

 

(2)

data management macros

 

 

 

293, 293, 293, 294, 294, 296, 296, 296, 297, 297, 298,

 

 

 

298, 299, 299, 300, 300, 300, 301, 301, 303, 304, 304,

 

 

 

304, 305, 305, 306, 306, 306, 306, 307, 307, 307, 308,

 

 

 

308, 309, 309, 311, 311, 312, 313, 314, 314, 314, 315,

 

 

 

315, 315, 315, 316, 316, 316, 317, 318, 319, 323, 323,

 

 

 

324, 324, 325, 326, 327, 327, 327, 328, 328

D150001

2043CH15

 

 

 

333

(1)

PL/I

 

 

(2)

functional differences

 

 

 

333, 334, 334, 334, 334, 335, 335

D150008

2043CH15

 

 

 

335

(1)

PL/I compiler options

 

 

(2)

options specific to DOS compiler

 

 

 

335, 336, 336, 336, 336, 336

Page 667
Image 667
IBM OS/390 manual XRL/21, Pl/I

OS/390 specifications

IBM OS/390, a versatile operating system, was a cornerstone in enterprise environments and played a pivotal role in mainframe computing. Released in the mid-1990s, OS/390 combined the strengths of IBM's MVS (Multiple Virtual Storage) with new features and enhancements, targeting scalability, reliability, and performance in demanding business applications.

One of the key features of OS/390 was its robust support for multiple users and processes. The system allowed thousands of concurrent users to access applications and data, ensuring high availability and minimizing downtime—a critical requirement for many large organizations. This scalability was supported through various enhancements in memory management and processor scheduling, enabling optimal resource allocation across diverse workloads.

OS/390 was known for its superior workload management capabilities. The Workload Manager (WLM) component allowed administrators to define service policies, specifying how system resources would be allocated according to the priority of tasks. This ensured that critical business processes received the necessary resources while less critical tasks were managed more flexibly.

Another significant characteristic of OS/390 was its commitment to security. The operating system provided comprehensive security features, including user authentication, data encryption, and auditing capabilities. This focus on security was vital for organizations handling sensitive data, ensuring compliance with regulations and safeguarding against unauthorized access.

OS/390 also supported advanced technologies that facilitated integration and development. The system included features like the IBM CICS (Customer Information Control System) for transaction processing and IMS (Information Management System) for database management. These technologies allowed organizations to build robust, high-performance applications tailored to specific business needs.

The ease of network integration was another strength of OS/390. With the advent of the Internet and global connectivity, OS/390 systems could easily interface with various network protocols, enabling businesses to operate in a connected world. This inclusion paved the way for many organizations to expand their capabilities and offer new services, driving digital transformation.

In conclusion, IBM OS/390 represented a significant advancement in mainframe technology, combining scalability, security, and robust workload management. Its rich feature set and support for critical enterprise applications solidified its role as a vital component of many organizations' IT infrastructures, ensuring they could meet their operational challenges head-on while supporting future growth. As technology continues to evolve, the legacy of OS/390 remains influential in the realm of computing.