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(1) If the "Used For" device is disabled in setup, the corresponding interrupt is available
for other devices.
(2) ACPI Operating System decides on particular IRQ usage.
5.2
Memory Area
The first 640 kB of DRAM are used as main memory. Using DOS, you can address 1 MB of memory directly. Memory area
above 1 MB (high memory, extended memory) is accessed under DOS via special drivers such as HIMEM.SYS and
EMM386.EXE, which are part of the operating system. Please refer to the operating system documentation or special
textbooks for information about HIMEM.SYS and EMM386.EXE.
Other operating systems (Linux or Windows versions) allow you to address the full memory area directly.
Upper Memory
Used for
Available
A0000h – BFFFFh
VGA Memory
No
C0000h – CFFFFh
VGA BIOS
No
D0000h – DFFFFh
-
Yes
E0000h – FFFFFh
System BIOS
No
5.3
I/O Address Map
I/O Address
Used for
0000 - 001F
System Resources
0020 - 003F
Interrupt Controller 1
0040 - 005F
Timer, Counter
0060 - 006F
Keyboard controller
0070 - 007F
RTC and CMOS Registers
0080
BIOS Postcode
0084 - 008F
DMA Page Register
0090 - 009F
System Control
00A0 - 00BF
Interrupt Controller 2
00E0 - 00EF
System Control
00F0 - 00FF
Math Coprocessor
0170 – 0177; 0376
Fixed Disk
01F0 - 01F7; 03F6
Fixed Disk
274 - 279
PnP Port
03B0 - 03DF
VGA
0400 - 043F
Chipset
0480 - 04BF
Chipset
04D0 - 04D1
Chipset
0900 - 091F
Power Management
09C0 - 09FF
GPE
0A05 – 0A06
WB83627HG Hardware Monitor
0A80 – 0A81
CPLD
0CF8 - 0CFF
PCI Configuration
D880 - D887
PCI LAN Controller
E080 - E09F
PCI USB Controller
E480 - E49F
PCI USB Controller
E880 - E887
VGA
EF00 - EF1F
PCI USB Controller
FFA0 - FFAF
PCI IDE Controller
48
Available
Comment
No
Fixed
No
Fixed
No
Fixed
No
Fixed
No
Fixed
No
Fixed
No
Fixed
No
Fixed
No
Fixed
No
Fixed
No
Fixed
No
Available if IDE port 1 is disabled
No
Available if IDE port 1 is disabled
No
Fixed
No
Fixed
No
Fixed
No
Fixed
No
Fixed
No
Fixed
No
Fixed
No
Fixed if WB83627HG is in system
No
Fixed
No
Fixed
No
Dynamic (BIOS default address)
No
Dynamic (BIOS default address)
No
Dynamic (BIOS default address)
No
Dynamic (BIOS default address)
No
Dynamic (BIOS default address)
No
Dynamic (BIOS default address)
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