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Summary A Level OCR Computer Science (1.1 Notes) £4.49   Add to cart
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Summary A Level OCR Computer Science (1.1 Notes)
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Boost your exam performance with our top-notch Computer Science Revision Notes, meticulously compiled from official mark schemes of past papers. These concise, exam-focused notes cover all topics in 1.1 (The characteristics of contemporary processors, input, output and storage devices) of the A Lev...

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  • June 21, 2024
  • 20
  • 2023/2024
  • Summary

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1.1 The characteristics of
contemporary processors,
input, output and storage
devices

, CPU Components
Arithmetic Logic Unit (ALU): Performs arithmetic (e.g addition) and logical
operations (e.g AND / OR / NOT comparison)
Control Unit (CU): Decodes instructions & sends control signals to
coordinate the flow of data through the processor

, Registers

Program Counter (PC): Holds the address of the next instruction to be
fetched. After sending the address to the MAR, the PC is incremented.
Memory Address Register (MAR): Stores the address of the instruction, to
be fetched, sent from the PC.
Memory Data Register (MDR): Stores the actual instruction after being
fetched from memory or before its sent to memory
Accumulator (ACC): Temporarily stores the results of calculations from ALU
Current Instruction Register (CIR): Holds the current instruction being
executed, splits it up into operand & opcode and then its decoded.

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