Components of a PC/Desktop
1. System Unit (within a Case / Cabinet)
SMPS (Switching Mode Power Supply)
Main Board (Mother Board)
Real Time Clock (RTC)
MicroProcessor (µP) or simply Processor
NorthBridge - connects µP and main memory
ROM (Read Only Memory) - Permanent and cannot be changed. Contains BIOS (Basic Input Output System) with POST (Power On Self Test).
RAM (Random Access Memory) - Volatile but rewritable memory.
Small battery to power RTC and keep user settings when PC is turned off.
SouthBridge - connects NorthBridge with I/O components.
Expansion Slots - for Add-On Cards
HDD (Hard Disk Drive)
SD Card / Flash Drive
Optical Disk Drive
Speaker with weak magnets (for beeps)
2. Input Device(s)
3. Output Device(s)
Display / Monitor / Screen
Now-a-days NorthBridge is usually within µP.
SouthBridge may be called Platform Controller Hub.