Input/Output Base Address

Base address is also called I/O port, I/O address, I/O port address and base port.

Common I/O Base Address Device Assignments in IBM PC compatible computers

Base Address	Device
0f – 1f	First DMA Controller 8237 A-5
20 – 3f	First Interrupt Controller 8259A, Master
40 – 5f	8254–2
60 – 6f	8042, Keyboard
70 – 7f	Real Time Clock, NMI mask
80 – 9f	DMA Page Register, 74LS612
87	DMA Channel 0
83	DMA Channel 1
81	DMA Channel 2
82	DMA Channel 3
8b	DMA Channel 5
89	DMA Channel 6
8a	DMA Channel 7
8f	Refresh
a0 – bf	Second Interrupt Controller 8259A, Slave
c0 – df	Second DMA Controller 8237 A-5
f0	Clear 80287 Busy
f1	Reset 80287
f8 – ff	80287 Math coprocessor
1f0 – 1f8	Hard Disk
200 – 20f	Game Controller/Joystick
210 – 217	Expansion Unit
278 – 27f	LPT2 Parallel port
280 – 29F	LCDon Wyse 2108 PC SMC Elite default factory setting
2e8 – 2ef	COM4
2e1	GPIB Adapter 0
2f8 – 2ff	COM2
2e2 – 2e3	Data acquisition
300 – 31f	Prototype Card
300 – 31f	3Com EtherLink default factory setting
320 – 32f	XT Hard disk interface
378 – 37f	LPT1 Parallel port
380 – 38c	SLDC/Secondary Bi-sync interface
3a0 – 3a9	Primary Bi-sync interface
3b0 – 3bb	Monochrome display
3c0 – 3cf	EGA disiplay control
3d0 – 3df	Color/Graphics Display (CGA)
3e8 – 3ef	COM3
3f0 – 3f7	Floppy disk controller
3f8 – 3ff	COM1

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