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instruction is also encoded and sent to the flag or the status register;
:* The second number is encoded as BCD and sent to the X register. This "pushes" (shifts) the first number out into the Y register;
:* When the key is pressed, a "message" (signal) from the flag or status register tells the processor that the operation to be done is "addition";
:* The numbers in the X and Y registers are then loaded into the

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