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Parallel Interface
The system has a 25-pin bidirectional parallel port on the system board. Port specifications
conform to the IBM-PC standards. The port supports Enhanced Capabilities Port (ECP) and
Enhanced Parallel Port (EPP) modes for devices that require ECP or EPP protocols. The
protocols allow high-speed bi-directional transfer over a parallel port and increase parallel port
functionality by supporting more devices.
The BIOS has automatic ISA printer port sensing that works with most devices. If the BIOS
detects an ISA printer port mapped to the same address, the built-in printer port is disabled.
(Verify in the BIOS Setup that printer ports mapped to the same address are enabled or disabled
appropriately.) The BIOS also sets the first parallel interface port it finds as LPT1 and the
second port it finds as LPT2. The interrupt is set at IRQ7 via the BIOS Setup Utility. Software-
selectable base addresses are 378h, 278h, and 3BCh.
Sets of I/O addresses for the parallel port are given in the following table (see Section 2,
"System Configuration," for interrupt levels). This is a list of all possible configurations; the
parallel port uses only one set.
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, COM2) integrated on the
I/O controller. The serial port(s) support the standard RS-232C interface. The buffered high-
speed serial port supports transfer rates up to 115.2 Kb. The port allows 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). Software-selectable base addresses are 3F8h, 2F8h, 3E8h,
and 2E8h.
Starting I/O Address
3F8
2F8
3E8
4-10 System Board
Parallel Port Addresses
Starting I/O Address
378
278
3BC
378
278
3BC
Serial Port 1 and Serial Port 2 I/O Addresses
Port
LPT1
LPT1
LPT1
LPT2
LPT2
LPT2
Port
COM1
COM2
COM3
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