Flashcards
Memory Addressing Modes - OCR Computer Science A Level
Cards in this deck (5)
- 1What are the 4 types of Memory Addressing Modes?> Immediate
> Direct
> Indirect
> Indexed - 2What is Immediate Addressing?> Opcode is the actual value to be used (i.e., the CPU does not use RAM at all to get the value)
> The CPU does not need to access another memory location as the data has already been given to it - 3What is Direct Addressing?> Opcode is the address for the memory location where the actual data can be found
> The CPU has to retrieve the value from the given memory location
> LMC uses direct addressing - 4What is Indirect Addressing?> Opcode is the location of the value to be used (usually a register)
> This allows the CPU to access a higher number of locations, as it is not limited to the maximum value of the opcode, which is usually a small number of bits - 5What is Indexed Addressing?> Opcode is one value added with another value stored in the index register
> This final added value gives the memory location of the data to be used
> Index register is a constant value - it represents the first memory location of an array of data
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- A level Computer Science Flashcards on Memory Addressing Modes - OCR Computer Science A Level, created by Malachy Moran-Tun on 02/11/2022.
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- Malachy Moran-Tun
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