I should add this: Why not just shift left? It's been a while, but I think the ADD A was really some 16-bit ADD. The key to making it small was this "inline rec

I should add this: Why not just shift left? It's been a while, but I think the ADD A was really some 16-bit ADD. The key to making it small was this "inline recursion" thing, which wouldn't have occurred to most of the crusty firmware folks I've worked with because of fear.