With solder and hot-melting glue.
The basic component inside the system unit is the Central Processing Unit.
processor
power supply HDD floppy disk drive
System unit refers to the housing plus the components inside the box. While a computer case is just a 'case' itself w/o the hardware components attached to it.
The freeway of parallel connections that facilitates communication between components within and connected to the system unit is known as the system bus. It consists of multiple parallel data lines that transmit data, address, and control signals between the CPU, memory, and peripheral devices. This architecture enables efficient data transfer and coordination among the various components of a computer system.
cars
Cpu: central processing unit alu: arithmetic and logical unit memory processor i/o devices
These are located in the system unit or processing unit.
System Unit
stuff
The components that process data are located in the system unit
peripherals