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Source and result operands can be in one of four areas:

Main or virtual memory: As with next instruction references, the main or virtual memory address must be supplied.

• Processor register:With rare exceptions, a processor contains one or more registers that may be referenced by machine instructions. If only one register exists,reference to it may be implicit. If more than one register exists, then each register is assigned a unique name or number, and the instruction must contain the number of the desired register.

• Immediate: The value of the operand is contained in a field in the instruction

being executed.

• I/O device: The instruction must specify the I/O module and device for the operation.If memory-mapped I/O is used, this is just another main or virtual

memory address.

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