Resources; Memory Map; I/O Addresses; System Memory Map - NEC POWERMATE 8100 Series Service And Reference Manual

Resources

The system memory map, I/O addresses, and DMA settings are given in the
following sections. System interrupt settings, parallel interrupt settings, and
serial interrupt settings are included in Section 2, "System Configuration."

Memory Map

The system memory map is shown in the following table.
Memory Space
100000-18000000
FC000-FFFFF
FA000-FBFFF
F9000-F9FFF
F8000-F8FFF
E8000-E7FFF
E0000-E7FFF
C8000-D7FFF
A0000-C7FFF
9FC00-9FFFF
80000-9FBFF
00000-7FFFF

I/O Addresses

The processor communicates with I/O devices by I/O mapping. The
hexadecimal (hex) addresses of I/O devices are listed in the following table.
Note:
typical but may vary by configuration.
Address (Hex)
0000-000F
0020-0021
002E-002F
0040-0043
0048-004B
4-26 System Board

System Memory Map

Size Function
383 MB Extended memory
16 KB Boot block
8 KB ESCD (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 (currently available as UMB)
96 KB Available HI DOS memory (open to ISA and PCI bus)
160 KB Video memory and BIOS
1 KB Extended BIOS data (movable by memory manager software)
127 KB Extended conventional memory
512 KB Conventional memory
In Plug and Play systems, these addresses are

I/O Address Map

I/O Device Name
PIIX4 - DMA controller 1 (channel 0-3)
PIIX4 - interrupt controller 1
Super I/O controller configuration registers
PIIX4 - counter/timer 1
PIIX4 - counter/timer 2