Elementary Computing
CSC 100
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Motherboard and I/O
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Inside of a motherboard System bus and I/O ports Memory Modules Video Interfaces USB Interfaces Bluetooth
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Outcomes
• The motherboard is populated with CPU, memory and I/O devices.
• I/O devices are classified as input or output devices.
• Most I/O devices are connected to a computer via standard external ports.
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Study Guide
• What is a motherboard?
• What is a System Bus?
• What is VGA, DVI and HDMI?
• What is USB?
• What is Bluetooth?
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A computer uses a motherboard to populate the CPU, RAM, system bus and I/O devices.
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What is a System Bus?
• A system bus is a set of wires connecting CPU, RAM and I/O devices.
• RAM is connected internally inside a computer.
• I/O devices are connected externally via a number of standard ports.
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A Desktop PC Motherboard
Memory goes here
System Bus
CPU
I/O Devices go here
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Input / Output Devices
Mouse
Keyboard
Printer
Monitor
Scanner
Hard drives
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CD ROM
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External Ports
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External Video Ports
• Most computer displays use the standard VGA (Video Graphics Array) connector.
• For high resolution displays, DVI (Digital Video Interface) is more common.
• Today, televisions and computer displays use HDMI (High Definition Media Interface). 10
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VGA Cable
15 pins VGA connector
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DVI Cable
DVI connector
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HDMI Cable
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Computer Monitor
VGA
HDMI
DVI
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External USB Connectors
• The USB (Universal Serial Bus) ports can be used for both input or output devices.
• A USB cable has two ends: type A (flat) goes to the computer; type B (square) goes to the device.
• USB is not designed to connect devices to devices, only devices to a computer.
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A regular USB cable
“B” end
“A” end
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A mini USB cable
“A” end
Mini “B” end
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USB ports
USB Devices go here
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USB (Input) Mouse & Keyboard
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USB (Input) Webcam
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USB Scanner & Printer
(Input)
(Output)
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USB Flash Memory Drives
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Flash Memory Cards
MicroSD
Secure Digital (SD)
Compact Flash (CF)
card
Memory Stick
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USB Memory Card Readers
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USB Hub
• Some computer/laptop may have only one or two USB ports.
• To connect many USB devices to a computer, we can add a USB hub.
• A USB hub allows multiple USB devices to share a single USB port.
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USB Hubs
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USB standards
• There are currently 3 USB standards, which are all backward compatible.
• USB 1, the oldest with normal-­‐speed.
• USB 2, the most common with high-­‐speed.
• USB 3 (in blue) the latest with super-­‐speed.
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USB 2 & 3
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Bluetooth
• It is a wireless standard for headsets and is invented by Ericsson. (Bluetooth is the name of a Swedish King.)
• It was designed primarily for cellphone applications.
• Today, Apple uses it in many of its wireless mice, keyboards and trackpads. Many tablets today now come with Bluetooth support.
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Bluetooth Devices
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The End.
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