Using SPECIAL Files

*..

1

...+...

2 ...

+

... 3 ...

+

... 4 ...

+...

5 ...

+...

6 ...

+...

7

...+...

*

DName+++++++++++ETDsFrom+++To/L+++IDc.Functions++++++++++++++++++++++++++++

D ERROR

S

 

 

 

5S 0

 

 

 

 

 

 

 

 

*..

1

...+...

2 ...

+

... 3 ...

+

... 4 ...

+...

5 ...

+...

6 ...

+...

7

...+...

*

CL0N01Factor1+++++++Opcode(E)+Factor2+++++++Result++++++++Len++D+HiLoEq.￿

...

*----------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

 

 

*

 

* The first 4 parameters are ILE RPG created parameter list￿.

 

*

 

* The rest are defined by the programmer-defined PLIST.

 

 

*

 

*----------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

 

 

*

 

C

 

*ENTRY

 

 

PLIST

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

PARM

 

 

 

OPTION

 

1

 

 

 

C

 

 

 

 

PARM

 

 

 

STATUS

 

1

 

 

 

C

 

 

 

 

PARM

 

 

 

ERROR

 

 

5 0

 

 

C

 

 

 

 

PARM

 

 

 

AREA

 

 

20

 

 

 

C

 

 

 

 

PARM

 

 

 

FLD1

 

 

1

 

 

 

*----------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

 

 

*

 

* The user written

 

program will perform the file I/O accord￿ing

 

*

 

* to the option passed.

 

 

 

 

 

 

 

 

*

 

*----------------------------------------------------------------

 

 

 

 

 

 

 

 

 

 

 

 

*

 

C

 

 

 

 

SELECT

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

WHEN

 

OPTION = 'O'

 

 

 

 

 

 

 

C*

perform OPEN operation

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

WHEN

 

OPTION = 'W'

 

 

 

 

 

 

 

C*

perform WRITE operation

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

WHEN

 

OPTION = 'C'

 

 

 

 

 

 

 

C*

perform CLOSE operation

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

ENDSL

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

RETURN

 

 

 

 

 

 

 

 

 

 

Figure 164.

User-written program USERIO

 

 

 

 

 

 

The

I/O operations for the SPECIAL device are controlled

by

the

user-

program USERIO. The parameters specified for the programmer-defined

 

PLIST(SPCL)

are

added

to the end of the RPG-created

parameter list

fo

SPECIAL

device. The programmer-specified parameters

can

be

accessed

by

user

ILE

RPG

program

and the user-written routine

USERIO;

whereas

the

RPG-created

parameter

list can be accessed only

by

internal

ILE

RPG

l

the

user-written routine.

 

 

 

 

 

 

330 ILE RPG for AS/400 Programmer's Guide

Page 353 Page 355
Page 354
Image 354
IBM AS/400 manual Are Added To the end of the RPG-created Parameter list, Program User-written routine, Userio
Page 353 Page 355

AS/400 specifications

The IBM AS/400, now known as the IBM iSeries, is a midrange computer system that has been a cornerstone of enterprise computing since its introduction in 1988. Designed to provide a robust platform for business applications, the AS/400 is celebrated for its reliability, scalability, and integrated database capabilities.

One of the key features of the AS/400 is its Integrated Operating Environment, which blends hardware and software resources seamlessly. This integration allows businesses to execute diverse workloads, ranging from traditional applications to modern web-based services, all on a single platform. The operating system, OS/400 (now IBM i), offers a rich set of APIs and tools for developers, simplifying application development and management.

Another standout characteristic of the AS/400 is its built-in database, DB2 for i. This powerful relational database management system allows for efficient data handling and provides advanced features such as support for SQL, XML, and JSON, making it easier for businesses to manage their data and integrate it with other systems. The database's tight integration with the operating system enables high performance and security.

In terms of scalability, the AS/400 can accommodate small businesses as well as large enterprises, with the ability to support hundreds of users simultaneously. Its architecture allows for easy upgrades in hardware, meaning that organizations can scale their systems without replacing the entire infrastructure.

Security is another critical attribute of the AS/400. With a sophisticated security model, it offers built-in user authentication, access control, encryption, and auditing capabilities to protect data and applications from unauthorized access.

The AS/400 also supports multiple programming languages, including RPG, COBOL, Java, and PHP, giving organizations the flexibility to choose the development tools that best fit their needs. This diversity helps maintain legacy applications while also developing new ones that leverage modern technologies.

Moreover, the platform supports both traditional green-screen interfaces and modern graphical user interfaces, allowing organizations to transition smoothly into contemporary user experience paradigms.

Overall, the IBM AS/400 stands out as a resilient, flexible, and secure computing platform that enables organizations to effectively manage their business operations, streamline processes, and adapt to changing market demands. Its unique combination of integrated features and capabilities ensures that it remains relevant in today's fast-paced technology landscape.
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