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Memory Stick
Memory stick is a portable memory card used as an add-on for smartphones, digital cameras,
Memory Stick SmartTV etc. its capacity varies from 4 GB to 128 GB.
Measuring Unit for Memory
The unit used to measure data stored in memory or storage devices is the byte. 1 Byte 8 bits
In computing, a byte for memory is equivalent to a kilometer for distance, a 1 Kilobyte (KB) 1024 Bytes
second for time, or a kilogram for weight.
1 MegaByte (MB) 1024 KB
Computers work in binary digits— 0 and 1 to form endless combinations of 8
bits(1 Byte). This byte represents a single letter, number, punctuation, or any 1 GigaByte (GB) 1024 MB
other special character on the keyboard. These bytes combine in different 1 TeraByte (TB) 1024 GB
forms to represent data. 1 PetaByte (PB) 1024 TB
• bit: A bit is the smallest measuring unit. It can be either 0(Off) or 1(On).
• Byte: A byte is the basic unit for measuring units. It is made up of 8 bits. 1 ExaByte (EB) 1024 PB
To represent huge data we have different units to measure as listed below: 1 ZettaByte (ZB) 1024 EB
Peripheral Device Ports
These ports act as a connector or a point of attachment between the external peripheral devices like mouse,
printer, keyboard, camera, scanner, etc. and the computer. There are different types of ports present in a computer
system. Some of the commonly used are discussed below:
• Serial Port: In Serial port data transmission between the computer and the peripheral device takes place in a
sequence of one bit at a time. It was used to connect mouse and external modems in older times. Nowadays it
is replaced by a USB port.
• Parallel Port: In Parallel port data transmission between the computer and the peripheral device takes place in
a parallel line of eight bits at a time. It is used to connect scanners and printers.
• USB Port: Universal Serial Bus is a new technology port which supports the connection of a variety of devices
like scanners, printers, keyboard, cameras, speakers, etc. to the computer. It is much faster than serial or parallel
ports. Smartphones, Tablets, e-book readers use USB port for charging.
• Ethernet Port: Ethernet Port provides a network connection by connecting the ethernet cables to the computer
for network and Internet connectivity using wired technology.
• HDMI Port: High Definition Media Interface port is used to connect high quality audio and video devices like
MP3 players, cameras, smart phones, Tablets, Smart TV to computers. It helps in the transmission of good
quality audio and video files.
• Power Port: It is used to connect the system to the power supply.
Motherboard
Motherboard or the main board consists of a board containing electric
circuits that connects all the important components of the computer. If
the CPU is the brain of the computer, then, the motherboard is the central
nervous system making it the backbone or spine of a computer system. It
consists of:
• Ports to connect different input and output devices. Motherboard
• Memory slots that contain the system’s main memory.
• ROM-BIOS chip that acts as an interface between the operating system and the hardware of a computer.
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