Even further back in the day, on systems with ferrite core memory, the contents of memory were retained even when the machine was powered down. So if you coul

Even further back in the day, on systems with ferrite core memory, the contents of memory were retained even when the machine was powered down. So if you could toggle in some bootstrap code into core, leave it there, and make sure nothing overwrites it, you won't have to toggle the bootstrap in next time.