computer science stater 5.0 / 5 based on 1 rating ? ComputingComputer systemsGCSEOCR Created by: camilarojas2001Created on: 08-01-18 10:56 Whats the CPU? the CPU (central processing unit) is a microprocessor. 1 of 28 explain what the 'Input' is information or data that feeds into the computer system from input devices such as keyboards and cameras. 2 of 28 explain what the 'Process' is this information thats collected needs to be processed so actions are carried out 3 of 28 explain what the 'output' is once process or acted on the result is presented. this could be either by speakers or by printers. 4 of 28 Arithmetic Logic Unit this is where all of the calculations take place these calculations can either be logic or mathematical 5 of 28 control unit the control unit controls the flow of data in the computer system 6 of 28 cache this is a small area in the CPU that has fast memory. Data is stored there when carrying out instructions. 7 of 28 Memory address register this is where the memory address is stored 8 of 28 Memory data register an instruction or piece of data is stored here. 9 of 28 Program counter this gives the CPU with the memory address of the next instruction 10 of 28 accumulator this is where the results of the calculations are temporary stored 11 of 28 bus a psychical pathway shared by signals to and from components. 12 of 28 Explain what is meant by 'fetch' the processor fetched the instruction and uses a program counter to keep track of it. 13 of 28 Explain what is meant by 'decode' once the instruction is loaded the computer needs to know what it means so it decodes it. 14 of 28 Explain what is meant by 'execute' the instruction is then carried out, this could either be a calculation or transfer of data. 15 of 28 the performance of the CPU can be affected by clock speed, cache size and number of cores. 16 of 28 explain what is meant by 'clock speed' the rate at which instructions are processed by the CPU 17 of 28 explain what is meant by 'cache size' cache memory allows temporary stored memory to be accessed quickly. 18 of 28 number of cores increases speed of a single processor. 19 of 28 what is an embedded system? an embedded system is a small computer with a specific task within a larger device. 20 of 28 name examples of embedded systems the program control of a dishwasher 21 of 28 whats is RAM? RAM is where the computer stores data that is currently in use. 22 of 28 name things the RAM does Much quicker access than the computer drive and it also quickly recalls important information. 23 of 28 what is ROM? ROM provides the computer system with instructions that do not change. 24 of 28 name things that the ROM does the instructions are permanently programmed into a chip that has specific instructions. 25 of 28 what is the difference between ROM and RAM? RAM can access data quickly and the information changes but in the ROM the information stays the same because the information cant be edited. 26 of 28 what is virtual memory? is used when a computer is running a lot of programs at once. Virtual memory is a section of volatile memory created temporarily. 27 of 28 when was Von Neumanns architecture created? 1945 28 of 28
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