> which os was written in Pascal? most were written in assembly in that era, you are talking about some obscure research or toy.

Your first claim: Every OS was written in C. Your new claim: Most were written in assembly.

Pick a position. If most were written in assembly then it would not have had any impact on the adoption of Ada so why make the original claim?

I would respond to your question but you substantially edited your comment and removed the question. I also notice you removed the claim in your edit about most OSes being written in assembly in the 80s. Obnoxious way to communicate with people, altering your comments while they're replying so their replies look like random comments.