A LEVEL OCR COMPUTER SCIENCE PAPER 1
ACTUAL 2026 QUESTIONS AND 100% CORRECT
ANSWERS
Play your way to mastery with fun games
Match Blocks Charms NEW
Terms in this set (512)
ALU (Arithmetic Logic Unit) completes all of the arithmetical and logical
operations.
What is the CU (Control Unit) - Controlling and coordinating the activities of the
responsible for? processor.
- Managing the flow of data between the processor
and other devices.
- Accepting the next instruction.
- Decoding instructions
- Storing the resulting data back in memory.
What is a Register? small memory cells that operate at a very high
speed, being used to temporarily store data and
conduct all arithmetic, logical, and shift operations.
, Program Counter (PC) holds the address of the next instruction to be
executed.
Accumulator (ACC) stores the results from calculations.
Memory Address Register (MAR) holds the address of a location that is to be read
from or written to.
Memory Data Register (MDR) temporarily stores data that has been read or data
that needs to be written.
Current Instruction Register (CIR) holds the current instruction being executed,
divided up into operand and opcode.
Buses a set of parallel wires which connect two or more
components inside the processor.
Data bus a bidirectional bus used for transporting data and
instructions between components.
Address Bus used to transmit the memory addresses specifying
where data is to be sent to or retrieved from. The
width of the bus is proportional to the number of
addressable memory locations.
Control Bus another bidirectional bus which transmits control
signals between internal and external components.
ACTUAL 2026 QUESTIONS AND 100% CORRECT
ANSWERS
Play your way to mastery with fun games
Match Blocks Charms NEW
Terms in this set (512)
ALU (Arithmetic Logic Unit) completes all of the arithmetical and logical
operations.
What is the CU (Control Unit) - Controlling and coordinating the activities of the
responsible for? processor.
- Managing the flow of data between the processor
and other devices.
- Accepting the next instruction.
- Decoding instructions
- Storing the resulting data back in memory.
What is a Register? small memory cells that operate at a very high
speed, being used to temporarily store data and
conduct all arithmetic, logical, and shift operations.
, Program Counter (PC) holds the address of the next instruction to be
executed.
Accumulator (ACC) stores the results from calculations.
Memory Address Register (MAR) holds the address of a location that is to be read
from or written to.
Memory Data Register (MDR) temporarily stores data that has been read or data
that needs to be written.
Current Instruction Register (CIR) holds the current instruction being executed,
divided up into operand and opcode.
Buses a set of parallel wires which connect two or more
components inside the processor.
Data bus a bidirectional bus used for transporting data and
instructions between components.
Address Bus used to transmit the memory addresses specifying
where data is to be sent to or retrieved from. The
width of the bus is proportional to the number of
addressable memory locations.
Control Bus another bidirectional bus which transmits control
signals between internal and external components.
