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1993-09-09
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DOCUMENT:Q102658 03-SEP-1993 [W_NT]
TITLE :Windows NT Does Not Provide IRQ Sharing
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
----------------------------------------------------------------------
Windows NT does not provide for interrupt request line (IRQ) sharing
unless the machine's hardware supports it, such as machines that use
Micro Channel Architecture (MCA). Unless it is supported by the
machine, you cannot use two IRQs simultaneously, such as devices on
ports COM1 and COM3, which both use IRQ 4.
The ability to share IRQs is hardware dependent. MCA machines are
normally able to share IRQs by default. Although Extended Industry
Standard Architecture (EISA) hardware does have IRQ sharing as part of
its specification, not all EISA machines implement IRQ sharing. Also,
on some implementations of EISA, IRQ sharing must be configured in
order to work. An example of this is Compaq's EISA machines, which are
not configured to share IRQs by default.
Industry Standard Architecture (ISA) machines running Windows NT may
have two devices set up to use the same IRQ with different COM ports,
but only one can have the IRQ or port open. Depending on the devices,
it is possible that either one or both will not operate, or there may
be intermittent problems with devices on the same IRQ.
Additional reference words: 3.10 conflict lock frozen
KBCategory:
KBSubcategory: ioput 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.