Yeah. I've written the boot code for some consumer machines, and those first few thousand cycles when you don't have RAM until you initialize the controllers an

Yeah. I've written the boot code for some consumer machines, and those first few thousand cycles when you don't have RAM until you initialize the controllers and test memory, that's pretty neat code to write. It's a time-honored coding technique, which I first saw on the 68000-based Macs in the 80s, and which probably dates back much earlier. Some Atari 2600 games didn't even use the stack pointer register, except as another slightly awkward temp register.