Some old fullscreen video masters "squeeze" the crawl so the full width is retained but the crawl is more tall and skinny. (Very similar to the way a anamorphic DVD looks in 16:9 mode on a regular tv set.) Others simply cropped the image and the result is you can't read a complete line of text until it's almost scrolled off. The pan and scan version the SciFi channel used to show simply letterboxed the image right up until the Stardestroyer comes up overhead.
Other studios have gone to ridiculous lengths in the past, redoing widescreen movie credits with video titles, (often not using the original font) just to avoid the actors looking tall and skinny!