I/O Port Addresses By KG
Referenced from- Upgrading And Repairing PCs (2nd Edition)

Input-output ports are addresses used by the processor to
communicate directly with devices. These addresses are like
memory addresses but are not for storage; 1,024 I/O ports are
available in the IBM system design for both XT- and AT-type
systems. Because the ports must be uniquely assigned to only
a single board or device, the potential for conflicts exists.
Plenty of I/O ports generally are available, but many boards
do not allow their default port addresses to be changed.

Below is a list of all the default port addresses for any PC
type system. Note that the I/O addresses hex 000 to 0FF are
reserved for the system board. Ports hex 100 to 3FF are
available on the I/O channel.

8-Bit ISA I/O Port Addresses
---------------------------------
Hex range    Device
000-00F      8237 DMA chip
020-021      8259 interrupt chip
040-043      8253 timer chip
060-063      8255 programmable peripheral interface chip
080          Manufacturer POST code port
080-083      DMA page registers
0A0          NMI mask register
0Cx          Reserved
0Ex          Reserved
200-20F      Game control
201          Game I/O
210-217      Expansion unit
278-27F      Parallel printer port 2
2B0-2DF      Alternate Enhanced Graphics Adapter (EGA)
2E1          GPID (Adapter 0)
2E2-2E3      Data acquisition (Adapter 0)
2F8-2FF      Serial port 2
300-31F      Prototype card
320-32F      Hard disk controller
348-357      DCA 3278
360-367      PC network (low address)
368-36F      PC network (high address)
378-37F      Parallel printer port 1
380-38F      SDLC, bisynchronous 2
390-393      Cluster
3A0-3AF      Bisynchronous 1
3B0-3BF      Monochrome Display and Printer Adapter
3F0-3F7      Floppy disk controller
3F8-3FF      Serial port 1
6E2-6E3      Data acquisition (Adapter 1)
790-793      Cluster (Adapter 1)
AE2-AE3      Data acquisition (Adapter 2)
B90-B93      Cluster (Adapter 2)
EE2-EE3      Data acquisition (Adapter 3)
1390-1393    Cluster (Adapter 3)
22E1         GPIB (Adapter 1)
2390-2393    Cluster (Adapter 4)
42E1         GPIB (Adapter 2)
62E1         GPIB (Adapter 3)
82E1         GPIB (Adapter 4)
A2E1         GPIB (Adapter 5)
C2E1         GPIB (Adapter 6)
E2E1         GPIB (Adapter 7)


Below lists all the default port addresses for any AT-type
system. Note that the I/O addresses hex 000 to 0FF are
reserved for the system board. Ports hex 100 to 3FF are
available on the I/O channel.

16-Bit ISA I/O Port Addresses
---------------------------------
Hex range    Device
000-91F      DMA controller 1, 8237A-5
020-03F      Interrupt controller 1, 8259A, master
040-05F      Timer, 8254-2
060          8042 (Keyboard)
061          System board I/O port
064          8042 (Keyboard)
070-07F      Real-time clock, NMI (Non-Maskable Interrupt) mask
080          Manufacturer POST code port
080-09F      DMA page registers 74LS612
0A0-0BF      Interrupt controller 2, 8237A-5
0F0          Clear math coprocessor
0F1          Reset math coprocessor
0F8-0FF      Math co-processor
1F0-1F8      Hard disk controller
21F          Voice communications adapter
278-27F      Parallel printer port 2
2B0-2DF      Alternate Enhanced Graphics Adapter
2E1          GPIB (Adapter 0)
2E2-2E3      Data acquisition (Adapter 0)
2F8-2FF      Serial port 2
300-31F      Prototype adapter
360-363      PC network (low address)
368-36B      PC network (high address)
378-37F      Parallel printer port 1
380-38F      SDLC, bisynchronous 2
3A0-3AF      Bisynchronous 1
3B0-3BF      Monochrome Display and Printer Adapter
3C0-3CF      Enhanced Graphics Adapter
3F0-3F7      Floppy disk controller
3F8-3FF      Serial port 1
6E2-6E3      Data acquisition (Adapter 1)
AE2-AE3      Data acquisition (Adapter 2)
EE2-EE3      Data acquisition (Adapter 3)
22E1         GPIB (Adapter 1)
42E1         GPIB (Adapter 2)
62E1         GPIB (Adapter 3)
82E1         GPIB (Adapter 4)
A2E1         GPIB (Adapter 5)
C2E1         GPIB (Adapter 6)
E2E1         GPIB (Adapter 7)