controlunit, It selects and retrieves instructions from the main memory, cache, allows quicker access to info for the CPU (shorter distance travelled)), registers, it can hold an instruction, a storage address, or any kind of data., clock speed, the measurement of cycles your CPU does per second, arithmeticlogicunit, performs simple addition, subtraction, multiplication, division, and logic operations, input, data that is entered into or received by a computer, output, e.g. printed documents, on-screen data and sound

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