Level 2
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CPU
processes data and executes instructions
Hertz
One cycle per second
Clock speed
The operating speed of a computer
Cache
Ultra high speed storage on CPU
MAR
Memory Address Register
MDR
Memory Data Register
CIR
Current Instruction Register
Main Memory
Where running programs, operating system and data are stored
Address Bus
Connection between the CPU(MAR) and main memory
Data Bus
Used to transfer data between main memory and the CPU
ALU
Carries out mathematical and logical calculations
Volatile Memory
Memory that loses data stored when powered off
