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Resources Required by Serial Ports
Port Name Base address I/O port range
COM1 0x3F8 0x3F8 – 0x3FF
COM2 0x2F8 0x2F8 – 0x2FF
COM3 0x3E8 0x3E8 – 0x3EF
COM4 0x2E8 0x2E8 – 0x2EF