Thanks, that makes sense. I remember the original model m's were real power hogs, to the point that USB->PS/2 converters rarely worked with them. Now I wonder

Thanks, that makes sense. I remember the original model m's were real power hogs, to the point that USB->PS/2 converters rarely worked with them. Now I wonder if they're just using the original circuit with a tacked on converter... might have to open it up to check.