This is quite interesting, but being a CS guy who just took a few hardware courses 15 years ago, there's something I'm missing here. I thought that if you took

This is quite interesting, but being a CS guy who just took a few hardware courses 15 years ago, there's something I'm missing here. I thought that if you took a ROM and just fed addresses and a clock signal into it, you'd get the data on the data out lines. Clearly there's something trickier going on here. Can anyone explain? Thanks!