OnBoard IDE
WinBIOS attempts to enable any hard disk drive controller on the
ISA Bus. If no hard disk drive controller is found on the ISA Bus,
the on-board IDE controller is enabled.
Serial Port 1 and Serial Port 2
WinBIOS also attempts to avoid address conflicts. If the off-board
serial ports are configured to specific starting I/O ports via jumper
settings, WinBIOS configures the on-board serial ports to avoid
conflicts.
WinBIOS checks the ISA Bus for serial ports. Any off-board serial
ports found on the ISA Bus are left at their assigned addresses.
Serial Port 1, the first on-board serial port, is configured with the
first available address and Serial Port 2, the second on-board serial
port, is configured with the next available address. The default ad-
dress assignment order is 3F8H, 2F8H, 3E8H, 2E8H. Note that this
same assignment order is used by WinBIOS to place the active serial
port addresses in lower memory (BIOS data area) for configuration
as logical COM devices.
After all addresses have been assigned, any remaining on-board
serial ports are disabled.
For example, if there is one off-board serial port on the ISA Bus and
its address is set to 2F8H, Serial Port 1 is assigned address 3F8H and
Serial Port 2 is assigned address 3E8H. Configuration is then as
follows:
COM1 - Serial Port 1 (at 3F8H)
COM2 - off-board serial port (at 2F8H)
COM3 - Serial Port 2 (at 3E8H)
The interrupts used by Serial Port 1 and Serial Port 2 may be as-
signed by jumpers on some processor boards. For those boards on
which the selectable interrupt jumpers are not available, Serial Port 1
utilizes interrupt 4 (IRQ4) and Serial Port 2 utilizes interrupt 3
(IRQ3).
PERIPHERAL SETUP
TECHNICAL REFERENCE
7-3
Summary of Contents for SB586TCP/166
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