SBC comm AMD SBC-770 - Manual (Page 86)

Chapter 3 Award BIOS Setup 75
Select Enabled if your system has a floppy disk controller (FDC)
installed on the system board and you wish to use it. If you install
an add-in FDC or the system has no floppy drive, select Disabled in
this field.
Onboard Serial Ports (1, 2)
Select a logical COM port address for the first and second serial
ports.
RxD, TxD Active
Consult your IR peripheral documentation to select the correct
setting of the TxD and RxD signals.
ECP Mode Use DMA
Select a DMA channel for the port.
EPP Mode select
Select EPP port type 1.7 or 1.9.