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| Question | Answer |
| What type of addressing has the value to be used in the operand? | Immediate, for example ADD 0011 could mean add 3 to the value in the accumulator. |
| What are the disadvantages of immediate addressing? | The value can not be reused between instructions, i.e the value would have to be repeated across every instruction that needs it. Also it is difficult to change the value. |
| What type of addressing points to the location in memory that holds the data? | Direct addressing. |
| What is a limitation of direct addressing? | The amount of memory addresses which can be utilised is dependent on the number of bits used for the operand of the instruction, e.g a 16 bit operand would allow 64kB of memory. |
| What is indirect addressing? | The operand points to a memory location which points to another memory location which contains the value. |
| Why is indirect addressing useful? | It allows access to a larger number of memory addresses. |
| What is indexed addressing? | A special register called the index register is used, this is incremented and added to a base address each time it is referred to. |
| What data structure is indexed addressing most useful for? | Arrays. |
| What type of addressing uses an index register? | Indexed addressing. |
| What is relative addressing? | All memory addresses are relative to a base address (the start of the program). |
| Why is relative addressing required? | We don't know where a program will be loaded into memory during execution, so all memory addresses would need to change. However the locations are still in the same place relative to the base address. |
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