APSRMARK (MVS)

240

 

Assembler macros (continued)

 

 

 

 

APTRMARK (VSE)

240

 

POST

285

 

 

 

 

 

 

 

 

APTZPARM m ac r o

241

 

PRTOV 296

 

 

 

 

 

 

 

 

ASCII subsystem

188

 

PUT 301, 305

 

 

 

 

 

 

 

Assembler

 

 

 

 

RCB

286

 

 

 

 

 

 

 

 

CALLDLI

173

 

 

READ

307, 313

 

 

 

 

 

 

 

conversion comments

267

REALAD

290

 

 

 

 

 

 

 

 

conversion tools

492

 

RELPAG

290

 

 

 

 

 

 

 

 

general conversion comments 267

RELSE

300, 306

 

 

 

 

 

 

 

initiation

269

 

 

RETURN

273, 281

 

 

 

 

 

 

migrating applications

359

RPL (additional MVS parameters) 291

 

 

migration

359

 

 

SAVE

272

 

 

 

 

 

 

 

 

products

267

 

 

SETPFA

290

 

 

 

 

 

 

 

 

programming interfaces

241

SHOWCB

292

 

 

 

 

 

 

 

TCP/IP applications using sockets API 196

SNAP

279

 

 

 

 

 

 

 

 

termination

269

 

TRUNC

300, 306

 

 

 

 

 

 

user exits

364

 

 

TTIMER

288

 

 

 

 

 

 

 

 

VSAM support

131

 

UNLOCK

281

 

 

 

 

 

 

 

Assembler macros

 

 

VSAM CHECK

292

 

 

 

 

 

 

ABEND

280

 

 

VSAM TCLOSE

292

 

 

 

 

 

 

ACB

290

 

 

 

WAIT

285

 

 

 

 

 

 

 

 

ATTACH

283

 

 

WAITF CLOSE

314

 

 

 

 

 

 

CANCEL

281

 

 

WRITE

307, 314

 

 

 

 

 

 

 

CCB

327

 

 

 

WTO

278

 

 

 

 

 

 

 

 

CDLOAD

278

 

 

WTOR

278

 

 

 

 

 

 

 

 

CHECK

307

 

 

Assembler Products

 

 

 

 

 

 

 

CHKPT

282

 

 

data management macros

 

 

 

 

 

CLOSE

298, 305, 314

 

CCB macro

327

 

 

 

 

 

 

CNTRL

296, 298, 306, 314

CHECK macro

307

 

 

 

 

 

 

COMRG

277

 

 

CLOSE macro

298, 305

 

 

 

 

DEQ

286

 

 

 

CNTRL macro

296, 298, 306, 314

 

 

DETACH

283

 

 

comparison of physical IOCS elements

328

DTFPH

328

 

 

definition of BLKSIZE

293

 

 

 

 

DUMP

280

 

 

Direct Access file processing

318

 

 

ENQ

286

 

 

 

DTFPH macro

328

 

 

 

 

 

 

EOJ

281

 

 

 

ERET macro

306

 

 

 

 

 

 

ERET

306

 

 

 

error bytes

312

 

 

 

 

 

 

EXLST

291

 

 

FEOV macro

301

 

 

 

 

 

 

FCEPGOUT

290

 

FEOVD macro

309

 

 

 

 

 

 

FEOV

301

 

 

 

general considerations

311

 

 

 

FEOVD

309

 

 

GET / PUT macros

301, 305

 

 

 

FETCH

278

 

 

I/O error checking

294

 

 

 

 

FREEVIS

289

 

 

IOREG

293

 

 

 

 

 

 

 

GET

301, 305

 

 

LIOCS Card File definition

294

 

 

GETIME

278

 

 

LIOCS Console file definition

304

 

 

GETMAIN

276

 

 

LIOCS Device-independent file definition

303

GETVIS

289

 

 

LIOCS Direct Access file definition

311

 

LOAD

277

 

 

 

LIOCS Indexed Sequential definition

326

LOCK

281

 

 

 

LIOCS Printer File definition

 

296

 

 

MVCOM

277

 

 

LIOCS Sequential file definition on DASD

 

NOTE

299, 309

 

 

devices

304

 

 

 

 

 

 

OPEN

297, 304, 314

 

LIOCS Tape File definition

297

 

 

PDUMP

279

 

 

List & Execute macro forms

 

293

 

 

PFIX

290

 

 

 

loading a DAM file (fixed-length records with

PFREE

290

 

 

keys)

319

 

 

 

 

 

 

 

POINTR

299, 308

 

loading a DAM file (fixed-length records without

POINTS

300, 308

 

keys)

323

 

 

 

 

 

 

 

POINTW

299, 308

 

loading a DAM file (undefined or variable-length

 

 

 

 

 

 

records)

323

 

 

 

 

 

 

592VSE to OS/390 Migration Workbook

Page 616
Image 616
IBM OS/390 Apsrmark MVS, Aptrmark VSE, Post, Prtov, Rcb, Calldli, Read, Realad, Relpag, Relse, Return, Save, Setpfa, Snap

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.