W12Lect (1)

W12Lect (1) - Interfaces Laptops Notebooks PDAs Printers 1...

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1 Interfaces Laptops / Notebooks / PDA’s Printers
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2 I/O Interfaces (Ports) The adapter  interface is a way  to connect one  piece of hardware  to another PS/2 Serial Ports USB Parallel Ports use a DB25-pin, female connector DB-9-male DB25 - male VGA port
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3 Serial Ports • The asynchronous serial interface is designed as a system-to- system/device communications port. Asynchronous means that no synchronization (clocking signal) is used for the timing of data transfer. Serial means that data is sent over a single wire, one bit after another. • Serial transfer can be achieved with as few as two wires – one for each direction (send and receive).
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4 Serial Port Configuration • Each time a character is received by a serial port, it has to get the attention of the computer by raising an Interrupt Request Line (IRQ). • IRQ assignment in a standard configuration is like this: – COM 1 uses IRQ4 – COM 2 uses IRQ3. – COM 3 uses IRQ4. – COM 4 uses IRQ3.
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Latest serial technology USB 2, 3 SATA FIREWIRE SCSI 3 ON motherboard PCI-express 1 bit serial communication over multiple lanes 5
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6 Parallel Port Transfers information in a sort of a wave, 8 bits at a time. They use a DB25-pin, female connector *** Types are Unidirectional, Standard bi-directional, ECP, SPP, and EPP. Special  parallel cables can be used to connect two computers  without the use of a NIC.
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7 External Parallel Ports • Today mainly used to connect printers to a PC. • They are general-purpose, relatively high-speed interface between devices. • They have eight lines for sending or receiving the bits that comprise 1 byte of data simultaneously across eight wires side by side.
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8 Parallel Port Configuration Standard LPT I/O Ports IRQ LPT1 LPT1 alternate LPT2 LPT2 IRQ5 IRQ5 IRQ7 3BC-3BFh 378-37Ah 278h-27Ah Memory address
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Universal Serial Bus • USB is an all- purpose port A serial bus standard for interfacing devices to a computer and portable devices • Reduces the need for special-purpose I/O cards (no reconfiguring with each new
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W12Lect (1) - Interfaces Laptops Notebooks PDAs Printers 1...

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