Would you mind detailing a little bit more on why you use the value 61 exactly?

Thank you. I am new to assembly and the low-level mindset and this was very informative and helpful. The reason I didn't use more self-documenting instructions (like dec) is because I'm limited to an instruction subset as a challenge for an assignment.

It's part of my code. I thought that line should be there, but when it isn't commented, it doesn't blink, it remains solidly lit (as far as I can tell).