Most of the demo coders that I followed (I wanted to become one, but never did anything significant there), and demo docs were done using Pascal. Eastern europeans (like myself) seemed to prefer it more for some reasons.
TSR applications while a bit large than pure .asm were possible!
When working on demo effects, I found it extremely important to have lightning fast edit-compile-run cycles. Before interactive demo editing tools became a thing, we had to modify code and recompile it to see anything. With Turbo Pascal (or TASM for that matter) you'd have results in under a second. Every now and then your demo would crash, but having set up AUTOEXEC.BAT to start Turbo Pascal, you'd be back in your editor in a few seconds.
I just don't understand how people can put up with waiting for compilers, Docker image downloads, and "continuous integration" builds that take upwards of whole minutes. Granted, it takes some effort to get things fast, but it is perfectly possible on modern hardware to have lightning fast compilation, and runtime replacement of modules. For some reason most people just don't care, and it sometimes makes one feel terribly lonely.
TSR applications while a bit large than pure .asm were possible!