Flashcards
Computer Science Revision Cards
Cards in this deck (20)
- 1What does a NOT Gate look like?
- 2What is the MAR and what does it do?The Memory Address Register stores the address of the data or instructions to be fetched from or sent to
- 3What is the ALU and what does it do?The Arithmetic and Logic Unit is where arithmetic and logical operations are performed. The results are stored in the accumulator.
- 4What is the CU and what does it do?The Control Unit controls how data moves around parts of the CPU and how it moves between the CPU and memory. Instructions are decoded in the CU.
- 5What is the PC and what does it do?The Program Counter always contains the address of the next instruction to be executed. It gets incremented to point to the next instruction.
- 6What is the ACC and what does it do?The Accumulator stores the results of calculations made by the ALU.
- 7What is the MDR and what does it do?The Memory Data Register stores the data that has been fetched from or stored in memory.
- 8What is the CIR and what does it do?The Current Instruction Register is where fetched instructions are copied to for execution.
- 9What does the Data Bus do?They carry/recieve data to/from the memory. Data can flow both ways.
- 10What does the Address Bus do?This gets information about where the data needs to go by carrying an address to the memory. Only sends data in one direction.
- 11What does the Control Bus do?Sends read or write signals to the RAM. Sends data in both directions.
- 12How does clock speed affect CPU performance?In 1 clock cycle the processor does the FDE cycle. A faster clock speed means more clock cycles per second meaning that more instructions happen in a second.
- 13How does the number of cores affect a CPU performance?Having more cores will allow multiple tasks to be exectued at the same time.
- 14How does cache affect CPU performance?It will allow more instructions to be stored near the CPU.
- 15What is pipelining?This is when multiple instructions are partially executed at the same time.
- 16Distributed OSIndependent networked computers combining processing power for a single task across a network. Presented to user as single system.
- 17Embedded OSDedicated function, low power, low cost, little memory required, limited amount of hardware resources.
- 18Multi-tasking OSLets multiple programs run at the same time. Programs scheduled so they each get a time slice of processor time.
- 19Multi-user OSLets more than one user access computer's resources at a time. They share processor time.
- 20Real-time OSLittle/no delay between input and computer's response. Executed within a known time frame, high rate of redundancy, processor never at capacity, used in critical environment.
Information
- Description
- A level Computing Flashcards on Computer Science Revision Cards, created by Jack Charlton on 04/03/2019.
- Created by
- Jack Charlton
- Views
- 11
- Rating