Larry Tesler’s work for the Macintosh.
Influencing the "native code" approach rather than an interpreted one. Key Innovations in 5.5 included: Turbo Pascal 5.5 Object Oriented Programming Guide
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. Larry Tesler’s work for the Macintosh
Version 5.5 also finalized the iconic IDE interface with pull-down menus that would define the look of software development for years to come. It introduced a step-by-step debugger and context-sensitive help that allowed developers to copy code snippets directly into their projects—a precursor to modern IDE features. 4. Legacy: From Anders to Delphi Turbo Pascal 5.5 When version 5
Flexibility in how memory was handled.
Automating the creation and cleanup of object data. 3. The "Blue Box" Era
Allowing for polymorphism where child objects could redefine behavior.