Gigabyte R281-2O0 Service Manual page 60

Options available for Serial Port 2:
Use Automatic Settings
IO=2F8h; IRQ=3; DMA;
IO=3F8h; IRQ=3, 4, 5, 7, 9, 10, 11, 12; DMA;
IO=2F8h; IRQ=3, 4, 5, 7, 9, 10, 11, 12; DMA;
IO=3E8h; IRQ=3, 4, 5, 7, 9, 10, 11, 12; DMA;
IO=2E8h; IRQ=3, 4, 5, 7, 9, 10, 11, 12; DMA;
Default setting is Use Automatic Settings.
BIOS Setup - 60 -