[Tor3]

"What killed Pascal?"

Where I worked, it was nothing in particular about the language (or at least the variant we used) itself. What happened was exactly what another comment said, quote:

"And then Unix happened. Every Unix system had a C compiler; and C ate Pascal's lunch. C was the cross-platform language of its day, more so than any other language that was available. And, from my point of view at the time, that's what killed Pascal."

For us, is was about a major product we had which we re-hosted to newer, much faster hardware. The original system was mostly written in Pascal, on a minicomputer. Or Fortran-77, for a (math-heavy) subset. There was nothing problematic with the Pascal code we used, but we couldn't use that on the the SGI hardware we moved to so we decided to port everything to MIPS-C, actually ANSI C (we limited features to the latter). Even the Fortran code. And from then on, everything we wrote was mostly in C, until C++ etc. became a thing. No new Pascal code was written on Unix.