Pci/Ide Ports; Power Management; Parallel Interface - NEC POWERMATE P - SERVICE MANUAL 1995 Service And Reference Manual

1-14 Technical Information
The PCI-bus operates at half the Pentium's processor speed, and supports memory transfer
rates of up to 105 MB per second for reads and up to 120 MB per second for writes,
depending on processor configuration.
The high-bandwidth PCI-bus eliminates the data bottleneck found in traditional systems,
maintains maximum performance at high clock speeds, and provides a clear upgrade path to
future technologies.
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/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 and 1.2 GB hard disk systems only) is connected to the secondary PCI/IDE
port.

Power Management

Each system is Energy Star compliant and comes with the power-saving features enabled. If
the keyboard, mouse, or drives are not used after 30 minutes (the default), the screen goes
blank and the system goes into a partial power shutdown. A blinking power lamp indicates
that the system is in the power-saving mode. As soon as activity is detected, the system
resumes where it left off.
The system can be manually put into power-saving Suspend mode by pressing the suspend
button or by entering a user-configurable hot-key sequence. Suspend mode provides the
greatest power savings by putting the system in maximum power shutdown. When the
system goes into Suspend mode, it saves data and system status and then shuts off power to
all possible components.
Through Setup, the amount of inactive time is adjustable. Power management can also be
disabled and the hot-key sequence set through Setup (see Section 2).

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.