confirmed that myramaaa works well on the simulator
[bugfix] IO didn't work
[bugfix] Fetch didn't work. The same bug as the previous.
[bugfix] reference to $15 was broken.
[bugfix] fetch doesn't change the state every clock (does it in every 3 clocks).
[bugfix] fix fetch. confirmed myramaaa works (again).
myramaaa2 now works
loopback now works on the simulator