NEC POWERMATE ES Series, Инструкция по обслуживанию и справочник

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4-10 System Boards
PCI/IDE Ports
The system board has two high-performance PCI/IDE ports: a primary port and a secondary
port. The primary PCI/IDE port has an enhanced IDE interface that supports PIO Mode 4
devices with 66 MB per second maximum burst rate data transfers on the high-performance
Ultra DMA bus. The port supports Ultra DMA/66.
The installed hard drive is connected as a master device on the primary PCI/IDE port. The
installed CD-ROM drive or DVD-ROM drive is connected to the secondary PCI/IDE port as a
master device. The hard drive is connected to the primary port with a two-connector
Ultra DMA/66 40-pin, 80-conductor cable. The CD-ROM or DVD-ROM is connected to the
secondary port with a two-connector IDE cable.
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 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.
Parallel Port Addresses
Starting I/O Address Port
378 LPT1
278 LPT2
3BC LPT3
378 LPT1
278 LPT2
3BC LPT3
Parallel interface signals are output through the system board’s 25-pin, D-subconnector. The
connector is located at the rear of the system unit.
Serial Interface
The system has one 16C550 UART compatible serial port (COM1) integrated on the I/O
controller. The serial port supports 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 all 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.