Pci/Ide Ports; Parallel Interface - NEC POWERMATE PROFESSIONAL 9000 Service Manual

1-24 Technical 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 that supports PIO Mode 4
devices with 16 MB per second, 32-bit wide data transfers on the high-performance PCI
local bus. Each channel supports Ultra DMA/33.
The installed hard disk drive is connected to the primary PCI/IDE connector with a three-
connector cable. If a CD-ROM reader is included in the system, it is connected to the
secondary PCI/IDE port with a three-connector cable. A second device can be added to the
primary or secondary PCI/IDE channel.

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 3BCh, 378h, and 278h.
Sets of I/O addresses and interrupts for the parallel port are given in Table 1-10. This is a
list of all possible configurations; the parallel port uses only one set.
Table 1-10 Parallel Port Addresses and Interrupts
Starting I/O Address
378
278
3BC
378
278
3BC
Interrupt Level
IRQ05
IRQ05
IRQ05
IRQ07
IRQ07
IRQ07
Port
LPT1
LPT2
LPT3
LPT1
LPT2
LPT3