CPU - perfroms all operations of the computer according to programmed instructions in the operating system software.
MCU/HID - Monitor and control various Human Interface Devices (mice, keyboards, etc) and maximize power efficiency of the design through various operating modes.
Memory - ROM contains the BIOS. RAM stores the application software and data files.
Disk Drives - stores operating systems, application programs, and data files.
Input/Output Ports - sends and receives data through serial ports, parallel ports, USB ports, and PC cards.
Sound Card and Speaker - plays sounds from CDs and DVDs.
Display - displays information and video/graphic on the LCD panel.
Input Devices - include the mouse, the trackball, the trackpoint, the touchpad, and the keyboard.
Fax/Modem - sends and receives data through the phone line.
Network Interface - allows the PC to connect to the LAN.
Power Conversion - converts the input power from the AC adaptor to run various functional blocks.