OSDIDBUF - /DBUFF PARAMETER FOR ADAPTEC AHA154X.ADD DRIVER IS NOT 
DESCRIBED IN THE ONLINE COMMAND REFERENCE
11/20/96

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/DBUFF Parameter for Adaptec AHA154X.ADD Driver Is Not Described in the 
Online Command Reference
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Please Read Entire Document for Full Explanation of Procedures
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DESCRIPTION

The /DBUFF parameter specified on the BASEDEV=AHA154X.ADD statement in 
CONFIG.SYS is missing from the OS/2 Warp 4 Command Reference.

To view the BASEDEV=AHA154x.ADD statement documentation:

1. Double-click on Assistance Center.

2. Double-click on Information.

3. Double-click on Reference and Commands.

4. Double-click on OS/2 Warp Command Reference.

5. Click on the (+) next to OS/2 Commands by Name.

6. Double-click on BASEDEV.

7. Under the heading Storage Adapter Support, double-click on
   Adaptec SCSI Adapter Products.

8. Double-click on AHA154X.ADD.

The /DBUFF parameter is not documented.

RESOLUTION

The /DBUFF parameter ensures that the user buffer for direct memory 
access (DMA) operations is available to an ISA bus by duplicating the 
buffer below the 16 MB boundary. Specify this parameter when your 
computer has more than 16 MB of physical memory and uses ISA SCSI host 
adapters. If this parameter is not specified, system performance might 
be reduced if the user buffer resides above the 16 MB boundary.

This parameter has no effect on a computer with less than 16 MB of 
physical memory.

warp4
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