System Board 4-11

Parallel Port Addresses

Starting I/O Address Port
378 LPT1
278 LPT1
3BC LPT1
378 LPT2
278 LPT2
3BC LPT2
Parallel interface signals are output through the system board’s 25-pin, D-subconnector. The
connector is located at the back of the system unit.
Serial Interface
The system has two 16C550 UART compatible serial ports (COM1 and COM2) integrated on
the I/O controller. The serial ports support the standard RS-232C interface. The buffered high-
speed serial ports support transfer rates up to 115.2 KB. The ports allow the installation of high-
speed serial devices for faster data transfer rates.
Sets of I/O addresses for the channels are given in the following table (see Section 2, “System
Configuration,” for interrupt levels). Soft-selectable base addresses are 3F8h, 2F8h, 3E8h, and
2E8h.

Serial Port 1 and Serial Port 2 I/O Addresses

Starting I/O Address Port
3F8 COM1
2F8 COM2
3E8 COM3
2E8 COM4
3F8 COM1
2F8 COM2
3E8 COM3
2E8 COM4
See Section 2, “System Configuration,” for information on resetting the port through the BIOS
Setup Utility. See Section 9, “Specifications,” for the serial interface specifications.
Serial interface signals are output through the system board’s 9-pin, D-subconnector. The
connector is located at the back of the system unit.