Technical Information 1-7
The system memory map in shown in Table Section 1-2.
Table Section 1-2 System Memory Map
Memory Space
Size
Function
100000-8000000
130048 KB
Extended memory (configurable/upgradable)
E0000-FFFFF
64 KB
AMI System BIOS
EC000-EFFFF
16 KB
FLASH boot block (available as UMB)
EA000-EBFFF
8 KB
ECSD (Plug and Play configuration area)
E9000-E9FFF
4 KB
Reserved for BIOS
E8000-E8FFF
4 KB
OEM logo (available as UMB)
E0000-E7FFF
32 KB
BIOS reserved (currently available as UMB)
C8000-DFFFF
96 KB
Available HI DOS memory (open to ISA and PCI
bus)
A0000-C7FFF
160 KB
Available HI DOS memory (normally reserved for
Video BIOS)
9FC00-9FFFF
1 KB
Extended BIOS data
80000-9FBFF
127 KB
Extended conventional
00000-7FFFF
512 KB
Conventional base memory
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 Section 1-3.
Table Section 1-3 I/O Address Map
Address (Hex)
I/O Device Name
0000-000F
PIIX3 - DMA controller 1 (channel 0-3)
0020-0021
PIIX3 - Interrupt controller 1
002E-002F
87308B I/O base configuration registers
0040-0043
PIIX3 - Timer 1
0048-004B
PIIX3 - Timer 2
0060
Keyboard controller byte - Reset IRQ
0061
PIIX3 - NMI, speaker control
Содержание POWERMATE PRO2180 - SERVICE 1996
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