Usb Interface; Resources; System Memory Addresses - NEC PowerMate Professional 9000E Series Service Manual

Serial interface signals are output through the system board's 9-pin,
D-subconnectors. The connectors are located at the back of the system unit. Pin
assignments for the serial interface connector are included at the end of this
section.

USB Interface

The Universal Serial Bus (USB) ports allow new Plug and Play serial devices to
be added without having to open the system. One USB device may be plugged
into each USB port for direct system connection. With a hub and the proper
cabling, up to 127 USB devices can be addressed by the system. The USB
determines system resources for each peripheral and assigns them without user
intervention. Boot support for a USB keyboard is present so the system can be
booted with a USB keyboard instead of a standard keyboard.

Resources

System memory starts ad address 0, and is continuous up to the maximum
amount of DRAM installed, except in ranges defined as memory holes. Base
and extended memory are both supported.
Memory range
Base memory
Extended memory
* Top physical memory is a maximum of 1 GB (to 3FFFFFFFh)
4-28 System Board

System Memory Addresses

address
00000h to 9FFFFh (to 640 KB)
0100000h to FFFFFFFFh (1 MB to 4 GB)*