Microsoft KB Archive/155415

= PCMCIA.SYS Fails to Load w/ Cirrus Logic CL-PD6730 Controller =

Article ID: 155415

Article Last Modified on 11/1/2006

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APPLIES TO


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

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This article was previously published under Q155415



SYMPTOMS
Systems using a Cirrus Logic CL-PD6730 PCMCIA controller(Intel-PCIC Chip) may cause Pcmcia.SYS to fail to load upon startup.



CAUSE
The problem occurs when the value of the Interrupt Line register is set to 255 (OxFF) on systems using the above mentioned Cirrus Logic controller.

According to the PCI Local Bus Specification Revision 2.1, the Interrupt Line and Interrupt Pin registers are defined as follows:

Interrupt Line register:
For x86 based personal computers, the values in this register correspond to the IRQ. 255 is defined as meaning "unknown" or "no connection" to the interrupt controller.

Interrupt Pin register:
The Interrupt Pin register tells which interrupt pin the device (or device function) uses. Devices (or device functions) that do not use an interrupt pin must put a zero in this register.



RESOLUTION
Obtain the fix referenced below.



STATUS
Microsoft has confirmed this to be a problem in Windows NT version 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

Keywords: kbnetwork KB155415

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