I/O Addressing; System Memory Map - NEC POWERMATE PRO2180 - SERVICE MANUAL 1997 Service Manual

The system memory map in shown in Table 1-2.
Memory Space
100000-8000000
E0000-FFFFF
EC000-EFFFF
EA000-EBFFF
E9000-E9FFF
E8000-E8FFF
E0000-E7FFF
C8000-DFFFF
A0000-C7FFF
9FC00-9FFFF
80000-9FBFF
00000-7FFFF

I/O Addressing

The processor communicates with I/O devices by I/O mapping. The hexadecimal (hex)
addresses of I/O devices are listed in Table 1-3.
Address (Hex)
0000-000F
0020-0021
002E-002F
0040-0043
0048-004B
0060
0061
Table 1-2 System Memory Map
Size Function
130048 KB Extended memory (configurable/upgradable)
64 KB AMI System BIOS
16 KB FLASH boot block (available as UMB)
8 KB ECSD (Plug and Play configuration area)
4 KB Reserved for BIOS
4 KB OEM logo (available as UMB)
32 KB BIOS reserved (currently available as UMB)
96 KB Available HI DOS memory (open to ISA and PCI
bus)
160 KB Available HI DOS memory (normally reserved for
Video BIOS)
1 KB Extended BIOS data
127 KB Extended conventional
512 KB Conventional base memory
Table 1-3 I/O Address Map
I/O Device Name
PIIX3 - DMA controller 1 (channel 0-3)
PIIX3 - Interrupt controller 1
87308B I/O base configuration registers
PIIX3 - Timer 1
PIIX3 - Timer 2
Keyboard controller byte - Reset IRQ
PIIX3 - NMI, speaker control
Technical Information 1-7