(I can't believe I'm the first to create a Turbo Pascal node.)
This is the dialect that saved Pascal, at least temporarily, from obscurity. Back in the early eighties, Borland International (now Inprise) with Phillipe Kahn at the helm started selling a Pascal compiler for fifty bucks that included a Wordstar-like editor and which compiled code blazingly fast entirely in memory (unheard of at the time, in the PC world). This was a truly astonishing thing at the time, and in a world in which people typically had two five and a quarter inch floppy drives and no hard disk, it was a positively HUGE thing, you really can't imagine what a big deal it was. The compiler fit on one 360k floppy with plenty of room left over. (Later versions would fix that.)
At version 4.0 Borland introduced packages and a large memory model, (previously all code had to fit in 64k, though the heap could grow to larger amounts, but a single pointer could point to at most 64k.) Version 4.0 was the first to produce ".exe" files and get around the 64k code barrier. (Heh, remember when ".com" meant something different?)
Version 5.5, introduced "true" object oriented features (ok, what the hell do I mean by "true?" I mean, inheritance, polymorphism, dynamic binding and encapsulation, all the good OOP stuff.) BTW the manuals included a slim volume called "Object-Oriented Programming Guide" which contained one of the clearest and best explanations of object oriented programming I've ever seen anywhere.
After version 6, I dropped ot of the PC world and into the world of Unix so I don't know anything more about what became of good old Turbo Pascal. Perhaps someone else can fill in the rest of the story.