Microsoft KB Archive/138738

= VESA Local Bus Device Conflicts in Windows NT =

Article ID: 138738

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 Q138738



SUMMARY
When you use VESA local bus devices in a Windows NT computer with a fast processor, one of the following STOP error messages may appear:

STOP 0x0000000A

IRQL_NOT_LESS_OR_EQUAL

STOP 0x0000007F

UNEXPECTED_KERNEL_MODE_TRAP

STOP 0x00000050

PAGE_FAULT_IN_NONPAGED_AREA



RESOLUTION
To correct this problem, do one of the following:


 * Disable the external cache on the computer. Some BIOS manufacturers include tuning parameters in the CMOS setup.

-or-
 * Add wait states to the L2 cache in the computer CMOS setup. This adjustment may compensate for slower devices.

For detailed information on the hardware, contact your computer manufacturer.



MORE INFORMATION
A maximum of three VESA local (VL) bus connections can reside on a motherboard. Each slot contains up to one VL-bus device. For example, if a VL-bus device such as a video controller physically resides on the motherboard, only two VL-bus slots are then allowed in the system. The following table lists recommended maximum number of slots at various buffered or unbuffered speeds:

 CPU Speed                    Unbuffered        Buffered --

Less or Equal to 33 MHz     2 slot/2 device   3 slot/3 device At 40 MHz                   1 slot/2 device   not recommended Greater or Equal to 50 MHz  0 slot/2 device   not recommended

Additional query words: prodnt

Keywords: KB138738

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