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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