I once purchased a Pascal compiler for the Atari ST. Can't recall its name, but it was written in Assembler, ran very fast (much faster than e.g. ST Pascal) an

I once purchased a Pascal compiler for the Atari ST. Can't recall its name, but it was written in Assembler, ran very fast (much faster than e.g. ST Pascal) and did everything in RAM, and thus felt a bit like TurboPascal. Accidentally, I discovered a certain key combination activated a microscopic BASIC interpreter that was integrated (undocumented); I wrote to the developers to learn that I was the first to find it.