This article talks about Wirth's Pascal as originally defined. But various language dialects evolved way beyond that, and some of them became effectively dominant.

Here's what low-level programming in Pascal looked like on DOS: http://www.retroarchive.org/swag/TSR/0022.PAS.html

Thanks for the link, I'll go take a look. I'm pretty sure Oberon addressed some of the pitfalls cited there, if only so Wirth could write an OS with it. Not every language is OS worthy, after all.