As I feared, this is not a 100% direct replacement for the Radio Shack (Scientific Atlanta) Model #15-100. Though it has a macro to power up multiple devices, it lacks the 15-100's extensive macro abilities. It does learn from other remotes, which is huge, but I don't think it will reassign keys the way the 15-100 does. So better than nothing, I guess, for when my 15-100 finally dies.