@retrofinds I tested it briefly, Comal was the programming language taught in schools back in the early 1990s when I went to school. Not in the C64 though, but this allowed trying it at home. I did have a disk version, though.
There is a scanned manual in @internetarchive at https://archive.org/details/comal-80-for-the-commodore-64/page/n10/mode/1up