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Hardware Extras (CPU)#

Types of hardware
- CPU
- RAM
- I/O Devices
- Secondary storage
CPU
- Reference to book is "highly" recommended
- Includes AU, CU and registers
  - ALU = Arithmetic & Logic Unit
    - Deals with the calculation part + and or not
    - Can only do addition and read the and or nots
    - worse than a calculator
  - CU = Control unit - NOT calculation, not and or not
  - Registers (stores data) - General Purpose register - Control Register (saves instructions that will run soon)
    - Instruction register (saves running instructions)
    - Memory Address Register (saves what offset is the data at in RAM)
    - Memory Data Register (saves the data pulled from offset in RAM)
    - Status Register (saves result of command)
    - Program counter (saves next command)
- CPU runs assembly code (ezpz)
  - assembly code become machine code and CPU run it
  - armconverter.com is your friend :) (armv7 and armv8 only)
- CPU rundown - fetch -> decode -> execute -> repeat
- clock rate - measurement unit: (G/M)Hz - G = 10⁹ (×1000 not ×1024. It is not a storage unit )
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 - How many times it can 通電 and 斷電 every second
 - Clock rate high ≠ processing speed fast
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- Word length - 32bit / 64bit - how long string can a bit store - more bit = more function