It's quite humbling to look at how much they had to know to implement all these little details, and then realise that this is a 45-year-old design which is seve

It's quite humbling to look at how much they had to know to implement all these little details, and then realise that this is a 45-year-old design which is several orders of magnitude less complex than modern processors. Even other well-known CPUs of the time like the 6502 and Z80 are only a few years older, yet far simpler.