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Personal Computer System (3) Parallel port parallel (Used for scanners and…
Personal Computer System
10) Optical drives
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5) Firewire port
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It has three variants: 4-Pin FireWire 400 connector, 6-Pin FireWire 400 connector, and 9-Pin FireWire 800 connector.
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3) Parallel port
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8) Graphic cards
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6) Ethernet port 
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1) VGA port
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Similar to the serial port connector. However, serial port connector has pins, VGA port has holes.
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2) Serial port 
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Two versions: 9 pin, 25 pin model
7) CPU
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It stores data, intermediate results, and instructions (program).
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4) Universal Serial Bus (USB) port
It can connect all kinds of external USB devices such as external hard disk, printer, scanner, mouse, keyboard,
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9)Hard drive
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A hard drive is a secondary storage device that consists of one or more platters to which data is written using a magnetic head, all inside of an air-sealed casing.