The given instructions: ADD 3000, ADD 1050, ADD 1900 are examples of immediate addressing mode.
Explanation:
Generally, any instruction has two fields, one to specify the instruction or operation to be performed, and another to provide the operand or some information about the operand like its effective address in the memory so that it can be fetched from there.
In the immediate addressing mode, there is an operand field rather than the address field which means that it directly provides the operand within the instruction itself. The instruction ADD 3000 says Add 3000 to the contents of the accumulator. The same goes for ADD 1050 and ADD 1900.
