GCSE COMPUTER SCIENCE J277 QUESTIONS AND CORRECT ANSWERS

GCSE COMPUTER SCIENCE J277
QUESTIONS AND CORRECT
ANSWERS


Central Processing Unit - ans-
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The chip that runs programs for the user and manages the rest of the hardware
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Control Unit - ans- ws ws ws


Controls execution of instructions, decodes the instructions, manages timing and sen
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ds signals to control other devices.
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Arithmetic and Logic Unit - ans- ws ws ws ws ws


Carries out arithmetic (+,-,*,/) and logic operations (and, or, not)
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Cache - ans- ws ws


Very fast memory near the CPU that stores frequently used instructions so it is quic
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ker than getting them from RAM
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Core - ans-A processor, a dual core computer has 2 processing in its in it's CPU
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Clock - ans- ws ws


A digital signal that controls the FDE cycle. 1 GigaHertz means 1 billion instructions
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are fetched and executed each second.
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Registers - ans- ws ws


Small pieces of very fast access memory int he CPU, used for special purposes in t
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he FDE cycle
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Fetch - ans-The first part of the FDE cycle, an instruction is fetched from RAM
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Memory Address Register - ans-
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Register that stores the address in memory that data is being fetched from or writte
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n to
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Memory Data Register - ans-ws ws ws ws


Register that holds a copy of the data being written to or read from memory
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