Microsoft KB Archive/69086

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EMM386 DMA Buffer and SCSI Devices

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Q69086

3.00 3.00a WINDOWS

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The information in this article applies to:


 * Microsoft Windows versions 3.0, 3.0a

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SYMPTOMS
If you are using EMM386.EXE in a system equipped with a SCSI host adapter, you may receive the error:

EMM386:\377DMA buffer is too small. Add D=nn parameter and reboot.

CAUSE
Direct memory access (DMA) is used by SCSI host adapters for data transfer. EMM386 maintains a buffer for DMA data transfers. This error indicates that the DMA buffer maintained by EMM386.EXE is not large enough to handle the size of DMA transfers made by the SCSI device.

RESOLUTION
As the message states, the error can be eliminated by using EMM386 DMA buffer size parameter D= in the CONFIG.SYS file as follows:

DEVICE=EMM386.EXE D=128 Start at a value of 32 and increase in increments of 16 until the error no longer appears. The default value is 16, the maximum value is 256.

Additional query words: 3.00 3.0 3.0a 3.00a win30 winmem

Keywords :

Issue type :

Technology : kbWin3xSearch kbWin300 kbWin300a