For few times I had a situation where I would have liked a way of changing register values in Atmel studio simulator without having to pause the simulation. So I looked into it and found the useful, but overlooked stimulifile. Probably this feature is overlooked by most hobbyist because it’s easier to use real board to debug than to use the time to write a stimulifile for the situation. Anyway I decided to get into this a bit and write a small program to make simple stimulifiles.