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1993-08-30
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DOCUMENT:Q103233 20-AUG-1993 [W_NT]
TITLE :ATI Cards Use EISA I/O Addresses in Windows NT
PRODUCT :Windows NT
PROD/VER:3.10
OPER/SYS:WINDOWS
KEYWORDS:
----------------------------------------------------------------------
The information in this article applies to:
- Microsoft Windows NT operating system version 3.1
- Microsoft Windows NT Advanced Server version 3.1
----------------------------------------------------------------------
SYMPTOMS
========
Windows NT may report I/O errors on EISA machines when an ATI card is
present.
The ATI cards use many addresses across the I/O space, and infringe on
Extended Industry Standard Architecture (EISA) addresses. This will
cause address conflicts with EISA cards. This problem has been noted
with the Adaptec 174x series and the Ultrastor.
WORKAROUND
==========
To work around this problem, move an EISA host adapter (for example,
from slot 1 to slot 3) so a different EISA address space (3C00 instead
of 1C00) will be used.
The ATI adapter uses EISA address space for its extended registers.
In MS-DOS, Windows, and OS/2, this problem can go unnoticed because
they don't check all I/O ranges. The miniport driver under Windows NT
reports the I/O that you will be using to access the hardware. Windows
NT keeps track of it. When the ATI card starts claiming the same I/O
ranges, the error gets reported under Event Viewer.
EISA specifications state that slot #1 uses addresses 1C00 - 1CFF,
slot #2 uses 2C00 - 2CFF, slot #3 uses 3C00-3CFF, and so on.
ISA uses address 00 - FF for I/O devices integrated onto the system
board and 100h - 3FFh for I/O expansion cards. 400 - FFFFh are
reserved.
There is nothing that can be fixed since EISA host adapters have to
use EISA address space (in fact, 1C80-1C83 are used to store card's ID
for slot 1, 2C80-2C83 for slot 2 ID).
The Adaptec and Ultrastor products included here are manufactured by
vendors independent of Microsoft; we make no warranty, implied or
otherwise, regarding these products' performance or reliability.
Additional reference words: 3.10 conflict crash
KBCategory:
KBSubCategory: hrdwr
=============================================================================
THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO
EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.
Copyright Microsoft Corporation 1993.