Microsoft KB Archive/247217

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3Com/U.S. Robotics 56K Modem Causes Windows 2000 to Bugcheck

Article ID: 247217

Article Last Modified on 11/1/2006


  • Microsoft Windows 2000 Professional Edition

This article was previously published under Q247217


When you start a computer running Microsoft Windows 2000 Professional, with a 3Com/U.S. Robotics 56K Plug and Play fax/modem installed, the system bugchecks during the startup process, and you receive the following error message:

SpTimeoutSynchronized: Adapter 0X80F09790 had interrupt pending - the system may not be delivering interrupts from this adapter


This behavior occurs because the Intel multiprocessor specification table does not contain entries for peripheral component interconnect (PCI) devices, such as this modem, and Windows 2000 does not correctly map the interrupt request level (IRQL).


Microsoft has confirmed that this is a problem in Microsoft Windows 2000 Professional.


The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

Additional query words: crash lock freeze hang

Keywords: kbprb KB247217