Dell OptiPlex GX260 Disassembly page 20

• Each processor has an instruction set
– Different processors have different instruction sets
• During a machine cycle (Clock cycle) the Control unit and
Arithmetic-Logic Unit (ALU)
1. Fetch instructions from memory and load to instruction register
2. Control unit decodes the instructions in the register
3. ALU executes the instructions
4. Store the result in a register or memory
– Bus width or word size is measured in bits. Number of bits
handled during internal processing
– Clock speed, how many cycles per second
Processing