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4 BIOS overview
BIOS addresses
Although the Setup program can be used to change some of the settings, the
following address map is not completely BIOS dependent, but is determined
partly by the operating system. Note that some of the I/O addresses are
allocated dynamically.
I/O Address Ports Function
0000 - 000F DMA controller
0010-001F, 0022 -003F, 0044-005F,
0062-0063, 0065-006F, 0072-007F, 0084-0086,
04D0-04D1, 0080, 0088, 008C-008E, 0090-009F,
00A2-00BF, 00E0-00EF, 0400-047F, 0480-04BF,
04D0-04D1, 0800-0847F
Motherboard resources
0020 - 0021, 00A0-00A1 Programmable Interupt Controller
0040 - 0043 System Timer
0060, 0064 PC/AT Enhanced Keyboard
0061 System Speaker
0070 - 0071 RTC and CMOS data
0081 - 0083, 008F, 0087, 0089-008B,
00C0-00DF
DMA Controller
00F0 - 00FF Numeric Data Processor
0170 - 0177 Ultra ATA Controller, Secondary ATA Controller
01F0 - 01F7 Ultra ATA Controller, Primary ATA Controller
0376 Ultra ATA Controller, Secondary ATA Controller
0378 - 037F, 0778 - 077F LPT1 ECP
03F8 - 03FF COM1
0CF8 - 0CFF PCI bus
03B0-03BB, 03C0-03DF Chipset Graphic Drivers
0540-054F SMBus controller
B000-BFFF PCI Bridge
BC00-BC7F NIC
03F6, FFA0 - FFA7, FFA0-FFAF Ultra ATA Controller, Primary ATA Controller
D400-D41F USB Universal Host Controller
D800-D83F, DCFF Audio
FFA0-FFA7 Primary ATA Controller
FFA0-FFAF Ultra ATA Controller
FFA8-FFAF Secondary ATA Controller