Pci Auto Configuration; Pci/Ide Ports; Parallel Interface - NEC POWERMATE VE - SERVICE MANUAL 05-1996 Service Manual

The PCI bus contains two embedded PCI devices, the PCI local bus IDE interface and the
PCI video/graphics controller.
PCI expansion slot connector pin assignments are provided in Appendix A.

PCI Auto Configuration

The system comes with a PCI auto configuration utility that operates in conjunction with
the system's Setup utility. The utilities automatically configure interrupts, DMA channels,
I/O space, and other parameters to allow addition of PCI boards with minimal user
intervention. (See Section 2 for Setup information.)

PCI/IDE Ports

The system board provides two high-performance PCI/IDE ports: a primary channel and a
secondary channel. Each port supports up to two devices for a total of four IDE devices.
The primary PCI/IDE port has an enhanced IDE interface which supports 11.1 MB per
second 32-bit wide data transfers on the high-performance PCI local bus. The installed
hard disk drive is connected to the primary PCI/IDE port. The installed CD-ROM reader
(multimedia, multimedia/network and 1.2 GB hard disk systems only) is connected to the
secondary PCI/IDE port.

Parallel Interface

The system has a 25-pin parallel bidirectional enhanced 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 bidirectional transfer over a parallel
port and increase parallel port functionality by supporting more devices.
The BIOS has automatic ISA printer port sensing. If the BIOS detects an ISA printer port
mapped to the same address, the built-in printer port is disabled. The BIOS also sets the
first parallel interface port it finds as LPT1 and the second port it finds as LPT2. The
interrupt is selected to either IRQ5 or IRQ7 via Setup. Software selectable base addresses
are 3BCh, 378h, and 278h.
I/O addresses and interrupts for the parallel port are given in Table Section 1-7.
NOTE: Any interrupts used for the built-in
parallel port are not available for ISA parallel
ports.
Technical Information 1-13