Almost everything "new" was invented by IBM it seems like. And it goes by a completely different name there. It's still nice to rediscover what they knew.

As another poster said, the impressive part here is the work on lining up all the technical features to implement this simple concept. Though I'm the end Laurie realized that essentially brute force worked well.

One thing that I'd think about improving is the boundary search. It seems to me at mere first glance that binary search would usually be much faster. Also, knowing what architecture is used, e.g. channel width, could further optimize the search.