Microsoft KB Archive/154700

= HALMCA Does Not Check got PCI =

Article ID: 154700

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 3.5
 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Server 3.5
 * Microsoft Windows NT Server 3.51

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This article was previously published under Q154700





SYMPTOMS
You may experience a performance problem on computers with PCI architecture.



CAUSE
The hardware abstraction layer (HAL) is treating PCI transfers like ISA transfers. Transfers that use buffers greater than 16MB are mapped into HAL buffers and the PCI transfer size limits are incorrectly set to ISA limits (limited to the HAL buffer size, which is typically 64K). The HalGetAdapter routine in the HALMCA does not check for PCI.



RESOLUTION
Obtain the fix referenced below. This fix to the HALMCA.DLL adds the condition to check for the PCI.



STATUS
Microsoft has confirmed this to be a problem in Windows NT versions 3.5 and 3.51. This problem was corrected in the latest Windows NT 3.51 U.S. Service Pack. For information on obtaining the Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K



MORE INFORMATION
The third-party products discussed here are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.

Additional query words: prodnt 3.50 3.51

Keywords: KB154700

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