The original model Famicom featured two game controllers, both of which were hardwired to the back of the console. The second controller lacked the START and SELECT buttons, but featured a small microphone. Relatively few games made use of this feature. The earliest produced Famicom units initially had <answer>square</answer> A and B buttons. This was changed to the circular designs because of the <answer>square</answer> buttons being caught in the controller casing when pressed down and glitches within the hardware causing the system to freeze occasionally while playing a game.
What shape were the A and B buttons on the earliest Famicom controllers?
square