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COMe-cTH6 User’s Guide

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8 System Resources

8.1 Interrupt Request (IRQ) Lines

Tables showing IRQ number assignments will be supplied in a future version of this manual.

8.2 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

C0000h – CFFFFh

VGA BIOS

Used by onboard VGA ROM

D0000h – DFFFFh

Yes

Free for shadow RAM in standard configurations.

E0000h – FFFFFh

System BIOS

Fixed

8.3 I/O Address Map

The I/O-port addresses of the COMe-cTH6 COM are functionally identical to those of a standard PC/AT system. All

addresses not mentioned in the table below 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.

I/O Address

Used for

Available

Comment

0000 - 001F

System Resources

Fixed

0020 - 003F

Interrupt Controller 1

Fixed

002E - 002F

Winbond driver

Fixed if W83627HG is in system

0040 - 005F

Timer, Counter

Fixed

004E - 004F

TPM

Fixed if TPM is in system

0060 - 006F

Keyboard Controller

Fixed

0070 - 007F

RTC and CMOS Registers

Fixed

0080

BIOS Postcode

Fixed

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Kontron COMe-cTH6 Manuel d'utilisateur Page 44

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