XIX Logical Names
The BIOS assigns Logical Names to the devices using an IRQ and memory address. Now IRQ 3 and I/O address 2F8-2FFh becomes Com 2.
This does not mean that you cannot change the standardized IRQ and I/O address. Be strongly cautioned however against doing this, "just because you can". And whenever you are building or working on a new system, be strongly advised to create a map of the system before you start making any changes.
Remember some programs will not ask the Operating System for details such as IRQ and I/O. Some programs require this information in their own setup. And there are a few older programs, such as games, that require the popular default settings for the ISA Sound Blaster. That is:
IRQ 5, I/O 220h, DMA 1
Table 9 shows the classical assignments of IRQs and I/O addresses in the PC.
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