Turbo Pascal 5.5 Object Oriented Programming Guide -

The Official OOP Guide (now a cult classic among retro-coders) famously told users to "strive to forget what people have told you about OOP" and just sit down and try it. 2. The Language Evolution

Before version 5.5, Turbo Pascal was the undisputed king of MS-DOS because of its speed—it could compile programs in seconds that took other compilers an hour. When version 5.5 arrived, it brought to the masses. For many developers, this was their first real exposure to concepts like classes, inheritance, and polymorphism. Turbo Pascal 5.5 Object Oriented Programming Guide

Influencing the "native code" approach rather than an interpreted one. Key Innovations in 5.5 included: The Official OOP Guide (now a cult classic

Flexibility in how memory was handled.