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4 Cards in this Set
- Front
- Back
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What are registers? |
Small amounts of high speed memory contained within the CPU |
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When are they usually needed? |
When the address of the next instruction needs to be executed When the current instruction is being decoded |
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What is MAR? |
Holds memory address about to be used by the CPU |
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What is MDR? |
Holds the actual data or instruction. This may have been fetched from memory or be waiting to be written to memory |
