Not all machines even in Tokyo accept IC cards, and despite new coins being aroud for 3 years there are a lot of machines (more than half from my experience) th

Not all machines even in Tokyo accept IC cards, and despite new coins being aroud for 3 years there are a lot of machines (more than half from my experience) that don't accept those coins. Some machines have a sign "we accept new coins" which means the default expectation is that they don't.