See "Moving Forth": https://www.bradrodriguez.com/papers/moving1.htm https://www.bradrodriguez.com/papers/moving1.htm The "interpreter" is just the macro that

See "Moving Forth": https://www.bradrodriguez.com/papers/moving1.htm https://www.bradrodriguez.com/papers/moving1.htm The "interpreter" is just the macro that handles execution of the next subroutine in a threaded program. As in: https://en.wikipedia.org/wiki/Threaded_code https://en.wikipedia.org/wiki/Threaded_code It might only be a call instruction, or a pointer increment and a jump. If you have to move the pointer to the working register to increment it, that's three instructions.