Parallel Port

PARALLEL PORT

General aspects

Input / Output Ports

The IO ports are constituted in the means by which the microprocessor of a computer communicates with its surroundings. Ports for each interaction of the unit of main processing with their auxiliary devices exist. Thus, it exists a port of input for the keyboard, an outport for the video, a port of input  for the mouse, etc. The Personal computer (PC) can address until 64K IO ports. Each port is designated by a number. Next the address in hexadecimal are listed of the most usual IO ports

 

 

More usual IO port addresses

Address

Description

From Even

000

00F

Controller of DMA (direct memory access)

020

02F

controller of interruptions

030

03F

controller of interruptions

040

043

Timer

060

060

Keyboard

061

061

speaker

170

17F

First hard disk

200

20F

games port

278

27F

Third parallel port LPT3

2E8

2EF

Serial port  4 COM4

2F8

2FF

Serial port 2 COM2

370

377

Floppy disk controller

378

37F

Second parallel port LPT2

3B0

3BB

Monochrome video adapter

3BC

3BF

First parallel port LPT1

3E0

3EF

Serial Port 3 COM3

3F8

3FF

Serial Port 1 COM1

220

22F

Usually the sound cards

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