8-5
PG 720 P Programming Device
C79000-G7076-C721-02
Table 8-2
I/O Address Assignments, continued
from
Possible Alternative Function
Basic Function
byte
to
03F0
03F5
6
On-board floppy
03F6
1
Primary IDE command
03F7
1
Primary IDE status / Floppy Chg.
03F8
03FF
8
COM1
Can be switched off in Setup; then free
0400
040A
11
Unoccupied
040B
1
EISA DMA Extended Mode Register
040C
04D5
202
Unoccupied
04D6
1
EISA DMA Extended Mode Register
04D7
0777
673
Unoccupied
0778
077A
3
ECP LPT 1
077B
0CF7
1405
Unoccupied
0CF8
0CFB
4
PCI Config Index (82C558E)
PCIDV0,1
0CFC
0CFF
4
PCI Config Data (82C558E)
PCIDV0,1
0D00
0FFF
768
Unoccupied
Table 8-3
DMA Assignments
DMA Channel
Data Transfer
Description
0
8 / 16 bits
Unoccupied
1
8 / 16 bits
Unoccupied
2
8 / 16 bits
Floppy
3
8 / 16 bits
Unoccupied
4
Cascading of DMA controllers
5
16 bits
Unoccupied
6
16 bits
Unoccupied
7
16 bits
Unoccupied
Table 8-4
PCI Configuration
Bus Number
Device No.
Function No.
Description
00h
00h
00h
82C557M (System Controller
PCIDV0)
00h
01h
00h
82C558E Integrated I/O Controller
PCIDV1
00h
14h
00h
82C558E IDE Register Space
00h
0Dh
00h-07h
GD7548 Cirrus LCD-SVGA
Hardware Information