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Architecture

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Program Counter (PC)

When button RUN is pressed in the Console, the CPU starts a "Opcode Fetch Cycle". The memory cell which address is currently indicated by PC, is read into register IR. Then the instruction is decoded and executed, and the Program Counter is incremented appropriately.

Once the instruction is complete, a next Opcode Fetch Cycle is initiated and so on, until the machine is halted some how.

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