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
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| COM Port | IRQ Level (*) | ||
Port No. | I/O Address |
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No. | Independent IRQ | Shared IRQ | |||
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Port 1 | 3F8h | COM1 | JP1 | JP1 | |
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Port 2 | 2F8h | COM2 | JP2 | JP1 | |
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Port 3 | 3E8h | COM3 | JP3 | JP1 | |
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Port 4 | 2E8h | COM4 | JP4 | JP1 | |
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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
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| COM Port | IRQ Level (*) | ||
Port No. | I/O Address |
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No. | Independent IRQ | Shared IRQ | |||
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Port 1 | Base Address | COM1 | JP1 | JP1 | |
+ 00h | |||||
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Port 2 | Base Address | COM2 | JP2 | JP1 | |
+ 08h | |||||
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Port 3 | Base Address | COM3 | JP3 | JP1 | |
+ 10h | |||||
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Port 4 | Base Address | COM4 | JP4 | JP1 | |
+ 18h | |||||
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Appendix B Quick Reference | 33 |