Dell Dimension 2100 System Reference Manual page 29

Table 4. Peripheral Configuration Submenu Options
Option Function
Serial port Configures the serial port. Set this option to Auto (default), Enabled,
A or Disabled. Depending on the port setting, you can set the following
additional options:
Base
I/OAddress
Interrupt
Parallel Configures the parallel port. Set this option to Auto (default), Enabled,
port or Disabled. Depending on the port setting, you can set the following
additional options:
Mode
NOTE: Before changing this setting, refer to the device manufacturer's
documentation for information on which mode to use.
Base
I/OAddress
If port is set to Enabled, available I/O addresses
are 3F8,3E8, 2F8, and 2E8.
If port is set to Enabled, available interrupts
are IRQ3 andIRQ4.
If port is set to Auto or Enabled, available modes
are OutputOnly, Bi-directional, ECP (default), and EPP.
If port is set to Enabled, available I/O addresses
are 378(default), 278, and 228.