It's not a question of remembering. It's a question of it being deeply relevant if you're writing an operating system. I've been there, just as everyone else w

It's not a question of remembering. It's a question of it being deeply relevant if you're writing an operating system. I've been there, just as everyone else who learned this stuff pre-internet. Not only did I know how much memory I could address, but the location and behaviour of various i/o ports and hardware interrupts, not because I have a good memory but because of necessity.