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  Port Addresses & IRQ's

The standard port adresses are given below. Most PCs have them. If you are using IBM PS/2, equipped with a micro-channel bus, different addresses and interrupt requests can be expected. Just like LPT ports, base adresses for -ports can be obtained from the data range in BIOS.

COM 13F84
COM 22F83
COM 33E84
COM 42E83
Standard Port Addresses

The table below contains the address having the addresses for COM-ports in BIOS data range. Each address has two bytes.

Start AddressFunction
0000:0400COM1's Base Address
0000:0402COM2's Base Address
0000:0404COM3's Base Address
0000:0406COM4's Base Address
COM Port Addresses in the BIOS Data Area
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