Liocs Printer File Definition, Cntrl Macro

	OPEN	CARD
VSE	GET	CARD,WORK
	.
	CLOSE CARD
CARD	DTFCD DEVADDR=SYSIPT,IOAREA1=CARDIN1,		C
		IOAREA2=CARDIN2,EOFADDR=END,	C
		WORKA=YES
	CDMOD WORKA=YES
	OPEN	CARD
MVS	GET	CARD,WORK
	.
	CLOSE CARD
CARD	DCB	DSORG=PS,MACRF=(GM),	C
		DDNAME=SYSIPT,EODAD=END,	C
		RECFM=FB,LRECL=80

Figure 33.	Card File Programs in VSE and MVS

13.2.6.6 LIOCS Printer File Definition

The methods of processing printer files are the same in VSE and MVS. Differences exist only in the CNTRL and PRTOV macros.

CNTRL Macro

VSE	CNTRL	filename ,code	,nl	,n2
		(1)

MVS	CNTRL	dcbaddress, SP	,nl
		SK

Notes:

1.MVS does not support delayed printer control.

2.The MVS Job Entry Sub-system supports machine and ASCII control characters.

PRTOV Macro

VSE	PRTOV	filename	,	12	,	routine name
		(1)		9		(0)

MVS	PRTOV	dcbaddress	,	12	,	overflow exit address
		(2-12)		9		(2-12)

The PRTOV macro results in the same action in VSE and MVS. However, if you use CNTRL, you cannot use SYSOUT=A and must specify the printer in the UNIT parameter of the output data set DD statement. Since this is rarely a viable option, programs that use the PRTOV macro should be converted to use a line counter instead.

Figure 34 on page 297 shows a comparison of the DTFPR and DCB operands.

296VSE 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 Liocs Printer File Definition, Cntrl Macro, Prtov Macro

Models: OS/390

CLOSE CARD

Card File Programs in VSE and MVS