NEC READY ES PRO, Service And Reference Manual

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The system memory map in shown in Table 1-2.
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 U6520222D 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.
CMOS Memory/Real-Time Clock Battery
The 430TX PCI ISA IDE Xcelerator (PIIX4) on the system board stores system information in non-volatile
Table 1-2 System Memory Map
Memory Address Size Function
100000-10000000 255 MB Extended Memory
F0000-FFFFF 64 KB BIOS
EC000-EFFFF 16 KB
Boot Block
(available as UMB)
EA000-EBFFF 8 KB
ECSD
(Plug and Play configuration and DMI)
E9000-E9FFF 4 KB Reserved for BIOS
E8000-E8FFF 4 KB OEM Logo or Scan User Flash
E0000-E7FFF 32 KB POST BIOS (available as UMB)
C8000-DFFFF 96 KB
Available High DOS memory
(open to ISA and PCI bus)
A0000-C7FFF 160 KB Video memory and BIOS
9FC00-9FFFF 1 KB
Extended BIOS Data
(moveable by memory managers)
80000-9FBFF 127 KB Extended conventional memory
00000-7FFFF 512 KB Conventional memory