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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 infor- mation about HIMEM.SYS and EMM386.EXE. Other operating systems (Linux or Windows versions)
allow you to address the full memory area directly.
Upper Memory
A0000h – BFFFFh
C0000h – CFFFFh
D0000h – DFFFFh
E0000h – FFFFFh
E0000000h – F0000000h
FEC00000h-FEC00040h
FED00000h FED003FFh
FED04000 FED4BFFF
FFC00000h - FFFFFFFFh
5.3
I/O Address Map
The I/O-port addresses of the are functionally identical to a standard PC/AT. All addresses not mentioned in this table
should be available. We recommend that you do not use I/O addresses below 0100h with additional hardware for
compatibility reasons, even if available.
I/O Address
0000 - 001F
0020 - 003F
0040 - 005F
0060 - 006F
0070 - 007F
0080
0084 - 008F
0090 - 009F
00A0 - 00BF
00E0 - 00EF
00F0 - 00FF
03B0 - 03DF
0400 - 043F
0480 - 04BF
04D0 - 04D1
0900 - 091F
09C0 - 09FF
0A05 – 0A06
0A80 – 0A81
0CF8 - 0CFF
47
Used for
VGA Memory
VGA BIOS
-
System BIOS
PCIe Config Space
IOxAPIC
HPET
TPM
BIOS Flash
Used for
System Ressources
Interrupt Controller 1
Timer, Counter
Keyboard controller
RTC and CMOS Registers
BIOS Postcode
DMA Page Register
System Control
Interrupt Controller
System Control
Math Coprocessor
VGA
Chipset
Chipset
Chipset
Power Management
GPE
WB83627HG Hardware Monitor
CPLD
PCI Configuration
COMe-mTT10 / System Resources
Available
No
No
Yes
No
No
No
No
No
No
Available
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Comment
Mainly used by graphic controller
Used by onboard VGA ROM
Free for shadow RAM in standard
configurations.
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Comment
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed if WB83627HG is in system
Fixed
Fixed
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