Parallel Interface; Serial Interface; Parallel Port Addresses - NEC POWERMATE 8100 Series Service And Reference Manual

Parallel Interface

The system has a 25-pin bi-directional 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 228h, 378h, and 278h.
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.
Starting I/O Address
378
278
228
378
278
228
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. Pin
assignments for the parallel interface connector are included at the end of this
section.

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. These ports allow the installation of high-speed serial devices for
faster data transfer rates.
Sets of I/O addresses for the two channels are given in the table on the following
page (see Section 2, "System Configuration," for interrupt levels). Soft-
selectable base addresses are 3F8h, 2F8h, 3E8h, and 2E8h.
4-16 System Board

Parallel Port Addresses

Port
LPT1
LPT2
LPT3
LPT1
LPT2
LPT3