Ditto Functions that are No Longer Supported

double asterisk (**) represents any number of characters in any number of qualifiers.

Under VSE and CMS, an implicit rewind was previously performed by each function that works with labeled tapes. Labeled tape functions could only work with the first file on a tape. The implicit rewind is no longer performed. This lets you work with multifile standard labeled tapes.

20.2 DITTO Functions that are No Longer Supported

The following table lists function codes that were allowed in previous releases of DITTO but are not recognized by DITTO/ESA. You can use the indicated replacement, if any.

Function	Description	Replacement

BDU	Buffer to Diskette	-

BIS, BI	Buffer to ISAM	-

CDU	Card to Diskette	-

DDD	Disk Dump with Deblocking	DP

DPD	Disk to Printer with Deblocking	DP

DKB	Diskette Browse	-

DKE	Diskette Eject and Feed	-

DKH, DKP	Diskette to Printer	-

DKI	Display Diskette Index	-

DKL	Diskette Record Load	-

DKN	Diskette to Console	-

DKS	Diskette Record Scan	-

DKV	Diskette Identification Change	-

DUC, DUI	Diskette File to Card	-

DUD	Diskette File to Diskette File	-

DUF	Diskette File to CMS File	-

DUH, DUP	Diskette File to Printer	-

DUS	Diskette File to SAM File	-

DUT	Diskette File to Tape	-

DUV	Diskette File to VSAM	-

FDD	CMS File Dump Deblocked	FP

FDU	CMS File to Diskette File	-

IDK	Initialize Diskette	-

IDP, ID	ISAM File Dump	-

IIS	ISAM File to ISAM File	-

IPR, IP	ISAM File Print	-

ISQ, IS	ISAM File to SAM File	-

ITP, IT	ISAM File to Tape	-

IVS, IV	ISAM File to VSAM	-

LE	Library Member Erase	LDEL

382VSE to OS/390 Migration Workbook

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.

IBM OS/390 manual Ditto Functions that are No Longer Supported, Function Description Replacement

Models: OS/390

20.2 DITTO Functions that are No Longer Supported

Function

Description

Replacement

382VSE to OS/390 Migration Workbook

OS/390 specifications