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| 4 LSB +<--------> PC | | 4 LSB | MAR <------------+<--------> A | | | | 4 LSB | | | | | v | v RAM <------------>|<-------- ALU | ^ | | | | | | <-------------+ | IR ------------->|<--------> B | 4 LSB | | | | | | 4 MSB +---------> OUT | | | v | | ins v decoder DISPLAY