Plug And Play Support; Table 1-4 System Memory Map - NEC DIRECTION L Service Manual

Memory Address
100000-18000000
FC000-FFFFF
FA000-FBFFF
F9000-F9FFF
F8000-F8FFF
E8000-E7FFF
E0000-E7FFF
C8000-DFFFF
A0000-C7FFF
9FC00-9FFFF
80000-9FBFF
00000-7FFFF

Plug and Play Support

The system comes with Plug and Play BIOS technology. Plug and Play eliminates
complicated setup procedures for installing Plug and Play expansion boards.
To add a Plug and Play expansion board, simply power off the system, install the board, and
power on the system. There are no jumpers to set and no system resource conflicts to
resolve. Plug and Play automatically configures the board for the system. The system also
supports non-Plug and Play boards.
Plug and Play is controlled by the Plug and Play BIOS and the system's operating system.
The Plug and Play BIOS is stored in the Intel PA28FB200BX Flash EPROM on the system
board.
The Plug and Play BIOS adds several steps to the POST process. During POST, the Plug
and Play evaluates the configuration of installed boards and assigns available system
resources to the devices. On completion of Plug and Play POST, the operating system
checks to see if there are any additional resources required, then assigns available resources
to the devices.

Table 1-4 System Memory Map

Size Function
384 MB Extended Memory
16 KB Boot Block
8 KB ECSD (Plug and Play configuration and DMI)
4 KB Reserved for BIOS
4 KB OEM Logo or Scan User Flash
64 KB POST BIOS
32 KB POST BIOS (available as UMB)
96 KB Available High DOS memory (open to ISA
and PCI bus)
160 KB Video memory and BIOS
1 KB Extended BIOS Data (movable by memory
managers)
127 KB Extended conventional memory
512 KB Conventional memory
Technical Information 1-7