Kontron COMe-cOHXX - Manual (Page 57)

Kontron COMe-cOH2/COMe-cOH6 User’s Guide
www.kontron.com
52
7 System Resources
7.1 Interrupt Request (IRQ) Lines
Tables showing IRQ number assignments will be supplied in a future version of
this manual.
7.2 Memory Area
The first 640 KBytes of DRAM are used as main memory. With DOS, you can
address 1 MByte of memory directly. The memory area above 1 MByte (high
memory, extended memory) is accessed under DOS with special drivers such as
HIMEM.SYS and EMM386.EXE, which are part of the operating system. See 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 Comment
A0000h – BFFFFh VGA Memory No Mainly used by graphic controller
C0000h – CFFFFh VGA BIOS No Used by onboard VGA ROM
D0000h – DFFFFh Yes Free for shadow RAM in standard
configurations.
E0000h – FFFFFh System BIOS No Fixed
7.3 I/O Address Map
The I/O-port addresses of the COMe-cOH# COM are functionally identical to
those of a standard PC/AT system. All addresses not mentioned in Table 16
should be available. For compatibility reasons, we recommend that you do not
use I/O addresses below 0100h for additional hardware, even if they are
available.
Table 16: I/O Address Assignments
I/O Address Used for Availabl
e
Comment
0000 - 001F System Resources No Fixed
0020 - 003F Interrupt
Controller 1
No Fixed
002E - 002F Winbond driver No Fixed if W83627HG
is in system
0040 - 005F Timer, Counter No Fixed
004E - 004F TPM No Fixed if TPM is in