NOTES

RAM8: trick is to figure out how to mux twice based on address, once for setting the load bit and once for picking the correct output bus.
RAM64: Interesting part here is that the MSB|LSB decision is arbitary. You could use the LSB to pick the RAM8 module, and use the MSB as the address within the RAM8, and it would still work. The caller for RAM64 doesn't care how you use the "complete address". It just cares that you return the same thing for that address.
RAM512: I used the premise of the previous note and decided to index the RAM64 moduls by the LSB instead of the customary MSB. It still works 🤘