Parallel and Serial Ports

The settings of input/output ports can be addressed in a separate subsection called “Onboard I/O Chip Setup”, “Super I/O Device”, “I/O Devices” or similar to it.

Onboard Serial Port 1/2 (COM Port 1/2)

This parameter switches on or off the first or the second serial port and also specifies the interruption and input/output address for it. Possible values:

  • Auto – serial port is off. The resources are distinguished automatically for it (recommended value);
  • 3F8/IRQ4, 2F8/IRQ3, 3E8/IRQ4, 2E8/IRQ3 – the input/output address and interruption for a port are selected from the proposed list;
  • Disabled (Off) – a serial port is off; it does not use any resources.


Onboard Parallel Port (Parallel Port)

This parameter adjusts the resources of the built-in parallel port through which a printer and other devices are connected.

Possible values:

  • 378/IRQ7 (by default), 3BC/IRQ7, 278/IRQ5 – the input/output address and interruption used by a parallel port;
  • Disabled (Off) – the port is off and it does not use any resources.

Some versions of BIOS use the separate parameters “Parallel Port Address” and “Parallel Port IRQ” instead of this parameter to set the input/output address and interruption accordingly.

Parallel Port Mode (Onboard Parallel Mode, Parallel Port Type)

This parameter selects an operating mode of built-in parallel port.

Possible values:

  • Normal (SPP) – a standard operating mode of parallel port (set this value when a device does not operate properly in much faster modes);
  • ECP, EPP or ECP+EPP – a port operates in one of fast modes (ECP or EPP). In this case the additional parameters for installing these modes may be available: EPP Mode Select (EPP Version) – installing the version of EPP (1.9 is recommended) and ECP Mode Use DMA (ECP Mode DMA Channel) – a number of DMA channel (DMA3 is recommended).