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

• Microsoft Windows NT Workstation version 3.51
• Microsoft Windows NT Server version 3.51

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.

   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

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