Equivalence of A&M

[kian]

In this video the lecturer says that A and M are interchangeable. Why then do we have two representations of the address in the register?

[kian]

It seems that A is the address and M is the value at the address. Correct me if I'm wrong.

[WBahn]

kian wrote

In this video the lecturer says that A and M are interchangeable. Why then do we have two representations of the address in the register?

Could you please provide a time reference for where in the video he says that they are interchangeable? At that point I can take a look and what he is saying and the context in which it is said.

My guess is that all he is saying is that they are syntactically interchangeable. In other words, if there is a legal instruction that uses one, then there also exists a legal instruction that uses the other. This would not be the same as saying that they are conceptually interchangeable.