
S875WP1-E TPS
Maps and Interrupts
Revision 4.0
35
4. Maps and Interrupts
In this section, Table 14 describes the system memory map, Table 15 shows the I/O map, Table
16 lists the DMA channels, Table 17 defines the PCI configuration space map, and Table 18
describes the interrupts.
4.1 Memory
Map
Table 14. System Memory Map
Address Range
(decimal)
Address Range
(hex)
Size
Description
1024 K - 4194304 K
100000 - FFFFFFFF
4095 MB
Extended memory
960 K - 1024 K
F0000 - FFFFF
64 KB
Runtime BIOS
896 K - 960 K
E0000 - EFFFF
64 KB
Reserved
800 K - 896 K
C8000 - DFFFF
96 KB
Available high DOS memory (open to the PCI bus)
640 K - 800 K
A0000 - C7FFF
160 KB
Video memory and BIOS
639 K - 640 K
9FC00 - 9FFFF
1 KB
Extended BIOS data (movable by memory manager
software)
512 K - 639 K
80000 - 9FBFF
127 KB
Extended conventional memory
0 K - 512 K
00000 - 7FFFF
512 KB
Conventional memory
4.2 I/O
Map
Table 15. I/O Map
Address (hex)
Size
Description
0000 - 00FF
256 bytes
Used by the Server Board S875WP1-E. Refer to the ICH5-R data
sheet for dynamic addressing information.
0170 - 0177
8 bytes
Secondary IDE channel
01F0 - 01F7
8 bytes
Primary IDE channel
0228 - 022F
(Note 1)
8 bytes
LPT3
0278 - 027F
(Note 1)
8 bytes
LPT2
02E8 - 02EF
(Note 1)
8 bytes
COM4/video (8514A)
02F8 - 02FF
(Note 1)
8 bytes
COM2
0376
1 byte
Secondary IDE channel command port
0377, bits 6:0
7 bits
Secondary IDE channel status port
0378 - 037F
8 bytes
LPT1
03B0 - 03BB
12 bytes
Intel 82875P MCH
03C0 - 03DF
32 bytes
Intel 82875P MCH
03E8 - 03EF
8 bytes
COM3
03F0 - 03F5
6 bytes
Diskette channel 1