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The components of the systerm unit
The inside of the system unit on a desktop personal computer includes:
- Drive bay
- Power supply
- Sound card
- Video card
- Processor
- Memory
Adapter card
- Sound card
- Video card
Expansion slot(socket on the motherboard )
The motherboard is the main circuit board of the
system unit
Expansion Slots and Adapter Cards
The system unit is a case that contains electronic components of the computer used to process data
Flash memory can be erased electronically
and rewritten
control unit
arithmetic logic unit (ALU)
clock speed(GHz)
The Components Of The Systerm Unit
The processor, also called the
central processing unit (CPU)
- Multi-core processor
- Dual-core processor
- Quad-core processor
Access time(amount of time it takes the processor to read from
memory)
MILLISECOND
MICROSECOND
NANOSECOND
PICOSECOND
Three basic types of RAM chips exist:
Dynamic RAM(DRAM)
Static RAM(SRAM)
Magnetoresistive RAM (MRAM)
Nonvolatile memory(ROM,CMOS)
Does not lose it contents when power is turn off.
Memory
Two types of memory
Volatile memory
nonvolatile memory
Data Representation
Volatile memory (RAM)
Loses its contents when power is turned off
Removable flash card
- Memory card
- USB flash drive
Measure
KB:kilo bytes
GB:giga bytes
MB:mega bytes
TB:tera bytess
Most computers are digital
Digital signals are in one of two states: on or off
Binary system : bits or bytes(0 and 1)
ASCII:is the most widely used coding scheme to
represent data