Unit 3: Computer Systems

MAT J

PSU(Power Supply Unit)

• AC (Alternating Current) and DC (Direct Current) are important because you can switch between both and change the current

Motherboard

• The Motherboard is the heart of the computer and holds all the other components for example the RAM, CPU and the Graphics Card.

• The different factors:• ATX (Advanced Technology Extended)• LPX (Low-Profile Extended) • NLX (New Low-Profile Extended)

CPU(Central Processing Unit)

• The functions of the CPU are that it helps the computer run. • The differences between Single core and Dual Core are that:• Single Core is fed strings of instructions it must order,

execute, then selectively store in its cache for quick retrieval.

• Dual Core processor each core handles incoming data strings simultaneously to improve efficiency. Now when one is executing the order can be accessing the system bus or executing its own code.

ROM

• The ROM is the Read-Only Memory and the different types of ROM are:

• ROM• PROM• EPROM• EEPROM

RAM

• The RAM is Random Access Memory is a form of computer data storage and RAM allows stored data to be accessed directly in any random order.

• The different types are:• DRAM• SDRAM

BIOS

• BIOS is Short for Basic Input/output System, the BIOS, ROM BIOS, or System BIOS is a chip located on all motherboards that contain instructions and setup for how your system should boot and how it operates.