GCSE OCR Computer science 1.1
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CPU - =Fetches and executes instructions
CU (single control unit) - =sends signals to control how data moves around the CPU
ALU (arithmetic logic unit) - =performs calculations and logic decisions
PC (program counter) - =holds the address of the next instruction in memory
MAR (memory address register) - =holds the address of where data is to be fetched or stored
MDR (memory data register) - =holds the data fetched from, or to be written to the memory
ACC (accumulator) - =holds the results of calcuations
Cache - =temporary storage which provides fast access to frequently used instructions and data
Von Neumann architecture - =not the most efficient but it's the simplest, fetches decodes and
executes, the programs and data are stored in memory
John von Neumann - =Mathematician and physicist, described first design for computers with
stored programs
benefits of cache - =more efficient and is a lot faster than main memory, don't need a big cache
to make a big difference
Save ALREADY PASSED
CPU - =Fetches and executes instructions
CU (single control unit) - =sends signals to control how data moves around the CPU
ALU (arithmetic logic unit) - =performs calculations and logic decisions
PC (program counter) - =holds the address of the next instruction in memory
MAR (memory address register) - =holds the address of where data is to be fetched or stored
MDR (memory data register) - =holds the data fetched from, or to be written to the memory
ACC (accumulator) - =holds the results of calcuations
Cache - =temporary storage which provides fast access to frequently used instructions and data
Von Neumann architecture - =not the most efficient but it's the simplest, fetches decodes and
executes, the programs and data are stored in memory
John von Neumann - =Mathematician and physicist, described first design for computers with
stored programs
benefits of cache - =more efficient and is a lot faster than main memory, don't need a big cache
to make a big difference
