American Megatrends 39 Series, Руководство пользователя

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Chapter 3 - BIOS POST
40
BIOS Automatically Detects Board I/O,
Continued
If the system has less than four serial ports, the BIOS assigns COM
ports in the above order. For example, if there are three Serial ports
with I/O addresses 3F8h, 3E8h, and 2E8h, they are assigned COM1,
COM2, and COM3, respectively.
If the system has an adapter I/O card with two serial ports (with I/O
port addresses 3F8h and 2F8h), the BIOS assigns the remaining two
addresses to the onboard serial ports, with SER1 assigned to the
higher of COM port.
If such an adapter card is installed in a Baby Voyager, remove the
jumpers from J6 and J9 to disable IRQ3 and IRQ4.
U s i n g T w o U s i n g T w o O f f B o a r d S e r i a l P o r t s a n d T w o O f f B o a r d S e r i a l P o r t s a n d T w o
O n b o a r d P o r t s O n b o a r d P o r t s
Since only two interrupt lines are available, you must have software
drivers to use four serial ports. Serial port I/O addresses and IRQs
must be assigned as follows:
Serial Port I/O
Address
IRQ
3F8h IRQ4
3E8h IRQ4
2F8h IRQ3
2E8h IRQ3