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Appendix B Quick Reference 33
STANDARD MODE: In this mode, the I/O addresses and the IRQ
levels for each port are set to default as shown below, (Disable BIOS
setting of on-board COM1 ~ COM4)
ENHANCED MODE: In this mode, the I/O addresses and the IRQ
levels for each port are set as shown below, (Make sure that the I/O
address on the BIOS setting of on-board COM1 ~ COM4 will never
conflict with [Base Address] ~ [Base Address + 1Fh])
Port No. I/O Address
COM Port
No.
IRQ Level (*)
Independent IRQ Shared IRQ
Port 1 3F8h COM1 JP1 JP1
Port 2 2F8h COM2 JP2 JP1
Port 3 3E8h COM3 JP3 JP1
Port 4 2E8h COM4 JP4 JP1
Port No. I/O Address
COM Port
No.
IRQ Level (*)
Independent IRQ Shared IRQ
Port 1
Base Address
+ 00h
COM1 JP1 JP1
Port 2
Base Address
+ 08h
COM2 JP2 JP1
Port 3
Base Address
+ 10h
COM3 JP3 JP1
Port 4
Base Address
+ 18h
COM4 JP4 JP1