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The System Unit by Mind Map: The System Unit
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The System Unit

Power supply

The power supply converts the wall outlet AC power into DC power

Some external peripherals have an AC adapter, which is an external power supply


Multi‐core processor

Dual‐core processor

Quad‐core processor


Volatile memory

Loses its contents when power is turned off

Example includes RAM, Dynamic RAM (DRAM), Static RAM (SRAM), Magnetoresistive RAM (MRAM)

Nonvolatile memory

Does not lose contents when power is removed

Examples include ROM, flash memory, and CMOS, Read‐only memory (ROM) refers to memory chips storing permanent data and instructions, A PROM (programmable read‐only memory) chip is a blank ROM chip that can be written to permanently, CMOS technology provides high speeds and consumes little power, Access time is the amount of time it takes the processor to read from memory

Expansion slot and Adapter Cards

An expansion slot is a socket on the motherboard that can hold an adapter card

An adapter card enhances functions of a component of the system unit and/or provides connections to peripherals – Sound card and video card

Plug and Play, the computer automatically can configure adapter cards and other peripherals as you install them

Removable flash memory includes: – Memory cards, USB flash drives, and PC Cards/ExpressCard modules


A computer chip contains integrated circuits

Ports and Connectors

A port is the point at which a peripheral attaches to or communicates with a system unit (sometimes referred to as a jack)

A connector joins a cable to a port


A bus allows the various devices both inside and attached to the system unit to communicate with each other – Data bus – Address bus

Word size is the number of bits the processor can interpret and execute at a given time


A bay is an opening inside the system unit in which you can install additional equipment – A drive bay typically holds disk drives