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Moving to Integrated Language Environment for RPG IV by Klaus Subtil

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Chapter 2.RPG Specification Sheets

Chapter Overview: This chapter describes the specifications and the changes that were made to enhance the RPG IV language definition.

2.1 RPG IV Specifications Statements

The first version of RPG was introduced by IBM almost 30 years ago based on the 80-column punch cards used at this time. Evolving over the years, the column orientation and limitations have been preserved, and RPG programmers have become familiar with it. Functions added over the years had to fit into the restrictive layout and sometimes led to misuse of certain functional specifications.

With RPG IV, new and often requested functions made a major redesign of the specification layouts necessary and opened the opportunity for modification. ...

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